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The following sections are provided:
This document describes the set of Cisco IOS troubleshooting commands that may be used by multiple service operators (MSOs) to verify communication between a Cisco uBR904 cable modem and other peripheral devices installed in the HFC network such as the headend Cisco uBR7246 router, a DHCP server, and a TFTP server.
The uBR904 troubleshooting system provides the following benefits:
CATV---Originally stood for Community Antenna Television. Now refers to any coaxial or fiber cable-based system that provides television services.
Cable modem (CM)---Any device that modulates and demodulates digital data onto a CATV plant.
Cable router---A modular chassis-based router optimized for data-over-CATV hybrid fiber-coaxial (HFC) applications.
Channel---A specific frequency allocation and bandwidth. Downstream channels used for television in the United States are 6 MHz wide.
CM---Cable modem.
CMTS---Cable Modem Termination System. Any DOCSIS-compliant headend cable router, such as the Cisco uBR7246.
DHCP---Dynamic Host Configuration Protocol. This protocol provides a mechanism for allocating IP addresses dynamically so that addresses can be reused when hosts no longer need them.
DOCSIS---Data Over Cable Service Interface Specification. Defines technical specifications for equipment at both subscriber locations and cable operators' headends.
Downstream---The set of frequencies used to send data from a headend to a subscriber.
Headend---Central distribution point for a CATV system. Video signals are received here from satellite (either co-located or remote), frequency converted to the appropriate channels, combined with locally originated signals, and rebroadcast onto the HFC plant. For a CATV data system, the headend is the typical place to create a link between the HFC system and any external data networks.
HFC---Hybrid fiber-coaxial (cable network). Older CATV systems were provisioned using only coaxial cable. Modern systems use fiber transport from the headend to an optical node located in the neighborhood to reduce system noise. Coaxial cable runs from the node to the subscriber. The fiber plant is generally a star configuration with all optical node fibers terminating at a headend. The coaxial cable part of the system is generally a trunk-and-branch configuration.
Host---Any end-user computer system that connects to a network. In this document, the term host refers to the computer system connected to the LAN interface of the cable modem.
MAC layer---Media Access Control sublayer. Controls access by the cable modem to the CMTS and to the upstream data slots.
MCNS---Multimedia Cable Network System Partners Ltd. A consortium of cable companies providing service to the majority of homes in the United States and Canada. This consortium has decided to drive a standard with the goal of having interoperable cable modems.
MSO---Multiple Service Operator. A cable service provider that also provides other services such as data and/or voice telephony.
QAM---Quadrature Amplitude Modulation. A method of modulating digital signals onto a radio-frequency carrier signal involving both amplitude and phase coding. QAM is a modulation scheme mostly used in the downstream direction (QAM-64, QAM-256). QAM-16 is expected to be usable in the upstream direction. Numbers indicate number of code points per symbol. The QAM rate or the number of points in the QAM constellation can be computed by 2 raised to the power of <number of bits/symbol>.
QPSK---Quadrature Phase-Shift Keying. A method of modulating digital signals onto a radio-frequency carrier signal using four phase states to code two digital bits.
Ranging---The process of acquiring the correct timing offset such that the transmissions of a cable modem are aligned with the correct mini-slot boundary.
SID (Service ID)---A number that defines (at the MAC sublayer) a particular mapping between a cable modem (CM) and the CMTS. The SID is used for the purpose of upstream bandwidth allocation and class-of-service management.
Subscriber Unit (SU)---An alternate term for cable modem. See cable modem.
Upstream---The set of frequencies used to send data from a subscriber to the headend.
The uBR904 cable modem is a standalone device; it works in conjunction with the Cisco uBR7246 universal broadband router.
See the companion to this document, "Bridging and Routing Features for the Cisco uBR904 Cable Modem" for information regarding prerequisites.
See the companion to this document, "Bridging and Routing Features for the Cisco uBR904 Cable Modem" for information regarding supported MIBs and RFCs.
Figure 1 shows the physical relationship between the devices in the HFC network and the cable modem.
To troubleshoot a malfunctioning cable modem, perform the following tasks:
Before you troubleshoot a Cisco uBR904 cable modem, you should be familiar with the cable modem initialization process. See Figure 2 and Table 1. Understanding this flowchart and sequence of events will help you determine where and why connections fail.
The sequence numbers shown in Figure 2 are explained in Table 1, which appears after the illustration. The cable modem will complete all the steps in this flowchart each time it needs to reestablish ranging and registration with the CMTS.
| Sequence | Event | Description | ||
|---|---|---|---|---|
| Scan for a downstream channel and establish synchronization with the headend Cisco uBR7246. | The cable modem acquires a downstream channel from the headend, saves the last operational frequency in non-volatile memory, and tries to reacquire the saved downstream channel the next time a request is made. An ideal downstream signal is one that synchronizes QAM symbol timing, FEC framing, MPEG packetization, and recognizes downstream sync MAC layer messages. | ||
| Obtain upsteam channel parameters. | The cable modem waits for an upstream channel descriptor (UCD) message from the headend Cisco uBR7246. This is done to retrieve transmission parameters for the upstream channel. | ||
| Start ranging for power adjustments. | The ranging process adjusts the cable modem's transmit power. The cable modem performs ranging in two stages: ranging state 1 and ranging state 2. | ||
| Establish IP connectivity. | The cable modem invokes DHCP requests to obtain an IP address, which is needed for IP connectivity. The DHCP request also includes the name of a file that contains additional configuration parameters, the TFTP server's address, and the Time of Day (TOD) server's address. | ||
| Establish the time of day. | The cable modem accesses the TOD server for the current date and time, which is used to create time stamps for logged events (such as those displayed in the MAC log file). | ||
| Establish security. | Keys for privacy are exchanged between the cable modem and the headend Cisco uBR7246. | ||
| Transfer operational parameters. | After the DHCP and security operations are successful, the cable modem downloads operational parameters from a configuration file stored on the cable company's TFTP server. | ||
| Perform registration. | The cable modem registers with the headend Cisco uBR7246. The cable modem is authorized to forward traffic into the cable network after the cable modem is initialized, authenticated, and configured. Note The Cisco uBR904 cable modem supports baseline privacy in Cisco IOS Release 11.3(5)NA and later, and in Cisco IOS Release 12.0(2)XC and later. | ||
| Comply with baseline privacy. | Link level encryption keys are exchanged between the headend and the cable modem. | ||
| Enter the operational maintenance state. | As soon as the cable modem has successfully completed the above sequence, it enters operational maintenance state. |
Because the MAC log file only holds a snapshot of 1023 entries at a time, you should try to display the cable modem's log file within 5 minutes after the reset or problem occurs.
The MAC log file is displayed by entering the show controllers cable-modem 0 mac log command from privileged EXEC mode.
The most useful display fields in this log file are the reported state changes. These fields are preceded by the message CMAC_LOG_STATE_CHANGE. These fields show how the cable modem progresses through the various processes involved in establishing communication and registration with the CMTS. The maintenance_state is the normal operational state, and the wait_for_link_up_state is the normal state when the interface is shut down.
The following is the normal progression of states as displayed by the MAC log:
wait_for_link_up_state ds_channel_scanning_state wait_ucd_state wait_map_state ranging_1_state ranging_2_state dhcp_state establish_tod_state security_association_state configuration_file_state registration_state establish_privacy_state maintenance_state
Following is an example of what the MAC log file looks like when the cable modem interface successfully comes up and registers with the CMTS. The output you see is directly related to the messages that are exchanged between the cable modem and the headend Cisco uBR7246.
uBR904# show controllers cable-modem 0 mac log 508144.340 CMAC_LOG_DRIVER_INIT_IDB_RESET 0x08098FEA 508144.342 CMAC_LOG_LINK_DOWN 508144.344 CMAC_LOG_LINK_UP 508144.348 CMAC_LOG_STATE_CHANGE ds_channel_scanning_state 508144.350 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 88/453000000/855000000/6000000 508144.354 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 89/93000000/105000000/6000000 508144.356 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 90/111250000/117250000/6000000 508144.360 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 91/231012500/327012500/6000000 508144.362 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 92/333015000/333015000/6000000 508144.366 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 93/339012500/399012500/6000000 508144.370 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 94/405000000/447000000/6000000 508144.372 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 95/123015000/129015000/6000000 508144.376 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 96/135012500/135012500/6000000 508144.380 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 97/141000000/171000000/6000000 508144.382 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 98/219000000/225000000/6000000 508144.386 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 99/177000000/213000000/6000000 508144.390 CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY 699000000 508145.540 CMAC_LOG_UCD_MSG_RCVD 3 508146.120 CMAC_LOG_DS_64QAM_LOCK_ACQUIRED 699000000 508146.122 CMAC_LOG_DS_CHANNEL_SCAN_COMPLETED 508146.124 CMAC_LOG_STATE_CHANGE wait_ucd_state 508147.554 CMAC_LOG_UCD_MSG_RCVD 3 508147.558 CMAC_LOG_UCD_NEW_US_FREQUENCY 20000000 508147.558 CMAC_LOG_SLOT_SIZE_CHANGED 8 508147.622 CMAC_LOG_FOUND_US_CHANNEL 1 508147.624 CMAC_LOG_STATE_CHANGE wait_map_state 508148.058 CMAC_LOG_MAP_MSG_RCVD 508148.060 CMAC_LOG_INITIAL_RANGING_MINISLOTS 40 508148.062 CMAC_LOG_STATE_CHANGE ranging_1_state 508148.064 CMAC_LOG_RANGING_OFFSET_SET_TO 9610 508148.066 CMAC_LOG_POWER_LEVEL_IS 28.0 dBmV (commanded) 508148.068 CMAC_LOG_STARTING_RANGING 508148.070 CMAC_LOG_RANGING_BACKOFF_SET 0 508148.072 CMAC_LOG_RNG_REQ_QUEUED 0 508148.562 CMAC_LOG_RNG_REQ_TRANSMITTED 508148.566 CMAC_LOG_RNG_RSP_MSG_RCVD 508148.568 CMAC_LOG_RNG_RSP_SID_ASSIGNED 2 508148.570 CMAC_LOG_ADJUST_RANGING_OFFSET 2408 508148.572 CMAC_LOG_RANGING_OFFSET_SET_TO 12018 508148.574 CMAC_LOG_ADJUST_TX_POWER 20 508148.576 CMAC_LOG_POWER_LEVEL_IS 33.0 dBmV (commanded) 508148.578 CMAC_LOG_STATE_CHANGE ranging_2_state 508148.580 CMAC_LOG_RNG_REQ_QUEUED 2 508155.820 CMAC_LOG_RNG_REQ_TRANSMITTED 508155.824 CMAC_LOG_RNG_RSP_MSG_RCVD 508155.826 CMAC_LOG_ADJUST_RANGING_OFFSET -64 508155.826 CMAC_LOG_RANGING_OFFSET_SET_TO 11954 508155.828 CMAC_LOG_RANGING_CONTINUE 508165.892 CMAC_LOG_RNG_REQ_TRANSMITTED 508165.894 CMAC_LOG_RNG_RSP_MSG_RCVD 508165.896 CMAC_LOG_ADJUST_TX_POWER -9 508165.898 CMAC_LOG_POWER_LEVEL_IS 31.0 dBmV (commanded) 508165.900 CMAC_LOG_RANGING_CONTINUE 508175.962 CMAC_LOG_RNG_REQ_TRANSMITTED 508175.964 CMAC_LOG_RNG_RSP_MSG_RCVD 508175.966 CMAC_LOG_RANGING_SUCCESS 508175.968 CMAC_LOG_STATE_CHANGE dhcp_state 508176.982 CMAC_LOG_DHCP_ASSIGNED_IP_ADDRESS 188.188.1.62 508176.984 CMAC_LOG_DHCP_TFTP_SERVER_ADDRESS 4.0.0.1 508176.986 CMAC_LOG_DHCP_TOD_SERVER_ADDRESS 4.0.0.32 508176.988 CMAC_LOG_DHCP_SET_GATEWAY_ADDRESS 508176.988 CMAC_LOG_DHCP_TZ_OFFSET 360 508176.990 CMAC_LOG_DHCP_CONFIG_FILE_NAME platinum.cm 508176.992 CMAC_LOG_DHCP_ERROR_ACQUIRING_SEC_SVR_ADDR 508176.996 CMAC_LOG_DHCP_COMPLETE 508177.120 CMAC_LOG_STATE_CHANGE establish_tod_state 508177.126 CMAC_LOG_TOD_REQUEST_SENT 508177.154 CMAC_LOG_TOD_REPLY_RECEIVED 3107617539 508177.158 CMAC_LOG_TOD_COMPLETE 508177.160 CMAC_LOG_STATE_CHANGE security_association_state 508177.162 CMAC_LOG_SECURITY_BYPASSED 508177.164 CMAC_LOG_STATE_CHANGE configuration_file_state 508177.166 CMAC_LOG_LOADING_CONFIG_FILE platinum.cm 508178.280 CMAC_LOG_CONFIG_FILE_PROCESS_COMPLETE 508178.300 CMAC_LOG_STATE_CHANGE registration_state 508178.302 CMAC_LOG_REG_REQ_MSG_QUEUED 508178.306 CMAC_LOG_REG_REQ_TRANSMITTED 508178.310 CMAC_LOG_REG_RSP_MSG_RCVD 508178.312 CMAC_LOG_COS_ASSIGNED_SID 1/2 508178.314 CMAC_LOG_RNG_REQ_QUEUED 2 508178.316 CMAC_LOG_REGISTRATION_OK 508178.318 CMAC_LOG_STATE_CHANGE establish_privacy_state 508178.320 CMAC_LOG_NO_PRIVACY 508178.322 CMAC_LOG_STATE_CHANGE maintenance_state
You can display other aspects of the MAC layer by using variations of the show controllers cable-modem 0 mac command:
uBR904# show controllers cable-modem 0 mac ? errors Mac Error Log data hardware All CM Mac Hardware registers log Mac log data resets Resets of the MAC state Current MAC state
For examples and descriptions of how to use these keywords, see the show controllers cable-modem mac command reference page.
The following sample log file is broken down into the chronological sequence of events listed below. Sample comments are also included in the log file.
The MAC layer informs the cable modem's drivers that it needs to reset. This is the first event that happens after the modem powers up and begins initialization. The fields LINK_DOWN and LINK_UP are similar to the shut and no shut conditions on a standard Cisco interface.
uBR904# show controllers cable-modem 0 mac log 528302.040 CMAC_LOG_LINK_DOWN 528302.042 CMAC_LOG_RESET_FROM_DRIVER 528302.044 CMAC_LOG_STATE_CHANGE wait_for_link_up_state 528302.046 CMAC_LOG_DRIVER_INIT_IDB_SHUTDOWN 0x08098D02 528302.048 CMAC_LOG_LINK_DOWN 528308.428 CMAC_LOG_DRIVER_INIT_IDB_RESET 0x08098E5E 528308.432 CMAC_LOG_LINK_DOWN 528308.434 CMAC_LOG_LINK_UP
Different geographical regions and different cable plants use different frequency bands. The Cisco uBR904 cable modem uses a built-in default frequency scanning feature to address this issue. After the cable modem finds a successful downstream frequency channel, it saves the channel to NVRAM. The cable modem recalls this value the next time it needs to synchronize its frequency.
The field CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND tells you what frequency the cable modem will scan for. The field CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY tells you the frequency the cable modem locked onto and saved to NVRAM for future recall. The field CMAC_LOG_DS_64QAM_LOCK_ACQUIRED communicates the same information. The field CMAC_LOG_DS_CHANNEL_SCAN_COMPLETED indicates that the scanning and synchronization was successful.
508144.348 CMAC_LOG_STATE_CHANGE ds_channel_scanning_state 508144.350 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 88/453000000/855000000/6000000 508144.354 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 89/93000000/105000000/6000000 508144.356 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 90/111250000/117250000/6000000 508144.360 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 91/231012500/327012500/6000000 508144.362 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 92/333015000/333015000/6000000 508144.366 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 93/339012500/399012500/6000000 508144.370 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 94/405000000/447000000/6000000 508144.372 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 95/123015000/129015000/6000000 508144.376 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 96/135012500/135012500/6000000 508144.380 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 97/141000000/171000000/6000000 508144.382 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 98/219000000/225000000/6000000 508144.386 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 99/177000000/213000000/6000000 508144.390 CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY 699000000 508145.540 CMAC_LOG_UCD_MSG_RCVD 3 508146.120 CMAC_LOG_DS_64QAM_LOCK_ACQUIRED 699000000 508146.122 CMAC_LOG_DS_CHANNEL_SCAN_COMPLETED
A frequency band is a group of adjacent channels. These bands are numbered from 88 to 99. Each band has starting and ending digital carrier frequencies and a 6 MHz step size. For example, a search of EIA channels 95-97 is specified using band 89. The starting frequency is 93 MHz, the ending frequency is 105 MHz.
The cable modem's default frequency bands correspond to the North American EIA CATV channel plan for 6 MHz channel slots between 90 MHz and 858 MHz. For example, EIA channel 95 occupies the slot 90-96 MHz. The digital carrier frequency is specified as the center frequency of 93 MHz. Channel 95 is usually specified using the analog video carrier frequency of 91.25 MHz, which lies 1.75 MHz below the center of the slot.
The search table is arranged so that the first frequencies tried are above 450 MHz. Because many CATV systems have been upgraded from 450 MHz to 750 MHz coaxial cable, digital channels have a high chance of being assigned in the new spectrum. The search table omits channels below 90 MHz and above 860 MHz since the DOCSIS specification does not mandate their coverage.
Some CATV systems use alternative frequency plans such as the IRC (Incrementally Related Carrier) and HRC (Harmonically Related Carrier) plans. Most of the IRC channel slots overlap the EIA plan. The HRC plan is not supported by Cisco's cable modems since so few cable plants are using this plan.
The cable modem waits for an upstream channel descriptor (UCD) message from the headend Cisco uBR7246. This is done to retrieve transmission parameters for the upstream channel.
508146.124 CMAC_LOG_STATE_CHANGE wait_ucd_state 508147.554 CMAC_LOG_UCD_MSG_RCVD 3 508147.558 CMAC_LOG_UCD_NEW_US_FREQUENCY 20000000 508147.558 CMAC_LOG_SLOT_SIZE_CHANGED 8 508147.622 CMAC_LOG_FOUND_US_CHANNEL 1 508147.624 CMAC_LOG_STATE_CHANGE wait_map_state 508148.058 CMAC_LOG_MAP_MSG_RCVD 508148.060 CMAC_LOG_INITIAL_RANGING_MINISLOTS 40
The ranging process adjusts the cable modem's transmit power. The cable modem performs ranging in two stages: ranging state 1 and ranging state 2.
The field CMAC_LOG_POWER_LEVEL_IS is the power level that the Cisco uBR7246 told the cable modem to adjust to. The field CMAC_LOG_RANGING_SUCCESS indicates that the ranging adjustment was successful.
508148.062 CMAC_LOG_STATE_CHANGE ranging_1_state 508148.064 CMAC_LOG_RANGING_OFFSET_SET_TO 9610 508148.066 CMAC_LOG_POWER_LEVEL_IS 28.0 dBmV (commanded) 508148.068 CMAC_LOG_STARTING_RANGING 508148.070 CMAC_LOG_RANGING_BACKOFF_SET 0 508148.072 CMAC_LOG_RNG_REQ_QUEUED 0 508148.562 CMAC_LOG_RNG_REQ_TRANSMITTED 508148.566 CMAC_LOG_RNG_RSP_MSG_RCVD 508148.568 CMAC_LOG_RNG_RSP_SID_ASSIGNED 2 508148.570 CMAC_LOG_ADJUST_RANGING_OFFSET 2408 508148.572 CMAC_LOG_RANGING_OFFSET_SET_TO 12018 508148.574 CMAC_LOG_ADJUST_TX_POWER 20 508148.576 CMAC_LOG_POWER_LEVEL_IS 33.0 dBmV (commanded) 508148.578 CMAC_LOG_STATE_CHANGE ranging_2_state 508148.580 CMAC_LOG_RNG_REQ_QUEUED 2 508155.820 CMAC_LOG_RNG_REQ_TRANSMITTED 508155.824 CMAC_LOG_RNG_RSP_MSG_RCVD 508155.826 CMAC_LOG_ADJUST_RANGING_OFFSET -64 508155.826 CMAC_LOG_RANGING_OFFSET_SET_TO 11954 508155.828 CMAC_LOG_RANGING_CONTINUE 508165.892 CMAC_LOG_RNG_REQ_TRANSMITTED 508165.894 CMAC_LOG_RNG_RSP_MSG_RCVD 508165.896 CMAC_LOG_ADJUST_TX_POWER -9 508165.898 CMAC_LOG_POWER_LEVEL_IS 31.0 dBmV (commanded) 508165.900 CMAC_LOG_RANGING_CONTINUE 508175.962 CMAC_LOG_RNG_REQ_TRANSMITTED 508175.964 CMAC_LOG_RNG_RSP_MSG_RCVD 508175.966 CMAC_LOG_RANGING_SUCCESS
After ranging is complete, the cable interface on the cable modem is UP. Now the cable modem accesses a remote DHCP server to get an IP address. The DHCP request also includes the name of a file that contains additional configuration parameters, the TFTP server's address and the Time of Day (TOD) server's address.
The field CMAC_LOG_DHCP_ASSIGNED_IP_ADDRESS indicates the IP address assigned from the DHCP server to the cable modem interface. The field CMAC_LOG_DHCP_TFTP_SERVER_ADDRESS marks the TFTP server's address. The field CMAC_LOG_DHCP_TOD_SERVER_ADDRESS indicates the time of day server's address. The field CMAC_LOG_DHCP_CONFIG_FILE_NAME shows the filename containing the transmission parameters. The field CMAC_LOG_DHCP_COMPLETE shows that the IP connectivity was successful.
508175.968 CMAC_LOG_STATE_CHANGE dhcp_state 508176.982 CMAC_LOG_DHCP_ASSIGNED_IP_ADDRESS 188.188.1.62 508176.984 CMAC_LOG_DHCP_TFTP_SERVER_ADDRESS 4.0.0.1 508176.986 CMAC_LOG_DHCP_TOD_SERVER_ADDRESS 4.0.0.32 508176.988 CMAC_LOG_DHCP_SET_GATEWAY_ADDRESS 508176.988 CMAC_LOG_DHCP_TZ_OFFSET 360 508176.990 CMAC_LOG_DHCP_CONFIG_FILE_NAME platinum.cm 508176.992 CMAC_LOG_DHCP_ERROR_ACQUIRING_SEC_SVR_ADDR 508176.996 CMAC_LOG_DHCP_COMPLETE
The Cisco uBR904 cable modem accesses the Time of Day server for the current date and time, which is used to create time stamps for logged events. The field CMAC_LOG_TOD_COMPLETE indicates a successful time of day sequence.
508177.120 CMAC_LOG_STATE_CHANGE establish_tod_state 508177.126 CMAC_LOG_TOD_REQUEST_SENT 508177.154 CMAC_LOG_TOD_REPLY_RECEIVED 3107617539 508177.158 CMAC_LOG_TOD_COMPLETE
The cable modem establishes a security association. The security_association_state is normally bypassed since "full security" as defined by the MCNS DOCSIS is not supported.
508177.160 CMAC_LOG_STATE_CHANGE security_association_state 508177.162 CMAC_LOG_SECURITY_BYPASSED
After the DHCP and security operations are successful, the cable modem downloads operational parameters from the cable company's TFTP server. These parameters are transferred via a configuration file. The field CMAC_LOG_DHCP_CONFIG_FILE_NAME shows the filename containing the transmission parameters.
508177.164 CMAC_LOG_STATE_CHANGE configuration_file_state 508177.166 CMAC_LOG_LOADING_CONFIG_FILE platinum.cm 508178.280 CMAC_LOG_CONFIG_FILE_PROCESS_COMPLETE
The cable modem registers with the headend Cisco uBR7246. After the cable modem is initialized, authenticated, and configured, the cable modem is authorized to forward traffic into the cable network. A successful registration is indicated by the field CMAC_LOG_REGISTRATION_OK.
508178.300 CMAC_LOG_STATE_CHANGE registration_state 508178.302 CMAC_LOG_REG_REQ_MSG_QUEUED 508178.306 CMAC_LOG_REG_REQ_TRANSMITTED 508178.310 CMAC_LOG_REG_RSP_MSG_RCVD 508178.312 CMAC_LOG_COS_ASSIGNED_SID 1/2 508178.314 CMAC_LOG_RNG_REQ_QUEUED 2 508178.316 CMAC_LOG_REGISTRATION_OK
Keys for baseline privacy are exchanged between the cable modem and the headend Cisco uBR7246. During this event, a link level encryption is performed so that a user's data cannot be "sniffed" by anyone else who is on the cable network.
Following is a trace that shows baseline privacy enabled. The key management protocol is responsible for exchanging two types of keys: KEKs and TEKs. The KEK (key exchange key, also referred to as the authorization key) is used by the headend CMTS to encrypt the TEKs (traffic encryption keys) it sends to the cable modem. The TEKs are used to encrypt/decrypt the data. There is a TEK for each SID configured to use privacy.
851.088 CMAC_LOG_STATE_CHANGE establish_privacy_state 851.094 CMAC_LOG_PRIVACY_FSM_STATE_CHANGE machine: KEK, event/state: EVENT_1_PROVISIONED/STATE_A_START, new state: STATE_B_AUTH_WAIT 851.102 CMAC_LOG_BPKM_REQ_TRANSMITTED 851.116 CMAC_LOG_BPKM_RSP_MSG_RCVD 851.120 CMAC_LOG_PRIVACY_FSM_STATE_CHANGE machine: KEK, event/state: EVENT_3_AUTH_REPLY/STATE_B_AUTH_WAIT, new state: STATE_C_AUTHORIZED 856.208 CMAC_LOG_PRIVACY_FSM_STATE_CHANGE machine: TEK, event/state: EVENT_2_AUTHORIZED/STATE_A_START, new state: STATE_B_OP_WAIT 856.220 CMAC_LOG_BPKM_REQ_TRANSMITTED 856.224 CMAC_LOG_BPKM_RSP_MSG_RCVD 856.230 CMAC_LOG_PRIVACY_FSM_STATE_CHANGE machine: TEK, event/state: EVENT_8_KEY_REPLY/STATE_B_OP_WAIT, new state: STATE_D_OPERATIONAL 856.326 CMAC_LOG_PRIVACY_INSTALLED_KEY_FOR_SID 2 856.330 CMAC_LOG_PRIVACY_ESTABLISHED
As soon as the cable modem has successfully completed the above events, it enters the operational maintenance state.
508178.322 CMAC_LOG_STATE_CHANGE maintenance_state
| Command | Purpose |
|---|---|
Displays high-level controller information. | |
Displays privacy state information. | |
Displays information about the Data Encryption Standard (DES) engine registers. | |
Displays information about the MAC and SID cable modem filters. | |
Displays the cable modem's internal mini-slot lookup table. | |
show controllers cable-modem mac [errors | hardware | log | resets | state] | Displays detailed MAC-layer information. |
Displays physical-layer information such as receive and transmit physical registers. | |
Displays tuning information. | |
show interface cable-modem | Displays information about the cable modem interface. |
To debug different components of a cable modem, enter one or more of the following commands in privileged EXEC mode:
| Command | Purpose |
|---|---|
debug cable-modem bpkm {errors | events | packets} | Debugs baseline privacy information. |
Debugs the bridge filter. | |
Debugs cable interface errors. | |
Debugs cable modem interface interrupts. | |
debug cable-modem mac {log [verbose] | messages} | Displays and debugs the MAC-layer log entries in real time. |
Debugs map message processing information. |
This section describees new and changed commands in Cisco IOS Release 12.0(3)T for troubleshooting the Cisco uBR904 cable modem.
All other commands used with this feature are documented in the Cisco IOS Release 12.0 command references.
To display high-level controller information about a cable modem, use the show controllers cable-modem command in privileged EXEC mode.
show controllers cable-modem number
number | Controller number inside the cable modem. |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
The show controllers cable-modem display begins with information from the first few registers of the Broadcom BCM3220 chip. Next is buffer information for the receive, receive MAC message, buffer descriptor, and packet descriptor rings. Then comes MIB statistics from the BCM3220 chip, DMA base registers to indicate where the rings start, global control and status information, and finally interrupts for the interrupt code.
When using this command, be sure to check the tx_count and the tx_head and tx_tail values for the buffer descriptor (TX BD) and packet descriptor (TX PD) rings. The tx_count should be greater than 0, and the tx_head and tx_tail values should not be equal. If these values do not change for a long period of time, it indicates there are packets stuck on the ring. This condition is often caused by the headend not giving grants.
Following is a sample output for this command:
uBR904# show controllers cable-modem 0
BCM Cable interface 0:
BCM3220 unit 0, idb 0x200EB4, ds 0x82D4748, regaddr = 0x800000, reset_mask 0x80
station address 0010.7b43.aa01 default station address 0010.7b43.aa01
PLD VERSION: 32
MAC State is ranging_2_state, Prev States = 7
MAC mcfilter 01E02F00 data mcfilter 01000000
DS: BCM 3116 Receiver: Chip id = 2
US: BCM 3037 Transmitter: Chip id = 30B4
Tuner: status=0x00
Rx: tuner_freq 699000000, symbol_rate 5055849, local_freq 11520000
snr_estimate 33406, ber_estimate 0, lock_threshold 26000
QAM in lock, FEC in lock, qam_mode QAM_64
Tx: tx_freq 20000000, power_level 0x3E, symbol_rate 1280000
DHCP: TFTP server = 4.0.0.32, TOD server = 4.0.0.188
Security server = 0.0.0.0, Timezone Offest = 0.0.4.32
Config filename =
buffer size 1600
RX data PDU ring with 32 entries at 0x201D40
rx_head = 0x201D78 (7), rx_p = 0x831BE04 (7)
00 pak=0x8326318 buf=0x225626 status=0x80 pak_size=0
01 pak=0x83241A0 buf=0x21DE5A status=0x80 pak_size=0
02 pak=0x83239C0 buf=0x21C22A status=0x80 pak_size=0
03 pak=0x8328C70 buf=0x22EA22 status=0x80 pak_size=0
04 pak=0x8325F28 buf=0x22480E status=0x80 pak_size=0
05 pak=0x8327CB0 buf=0x22B1C2 status=0x80 pak_size=0
06 pak=0x8323BB8 buf=0x21C936 status=0x80 pak_size=0
RX MAC message ring with 8 entries at 0x201E80
rx_head_mac = 0x201E88 (1), rx_p_mac = 0x831BE80 (1)
00 pak=0x8326120 buf=0x224F1A status=0x80 pak_size=0
01 pak=0x8324590 buf=0x21EC72 status=0x80 pak_size=0
02 pak=0x8323FA8 buf=0x21D74E status=0x80 pak_size=0
03 pak=0x8326EE8 buf=0x22806E status=0x80 pak_size=0
04 pak=0x8328E68 buf=0x22F12E status=0x80 pak_size=0
05 pak=0x8327AB8 buf=0x22AAB6 status=0x80 pak_size=0
06 pak=0x8328880 buf=0x22DC0A status=0x80 pak_size=0
07 pak=0x8326CF0 buf=0x227962 status=0xA0 pak_size=0
TX BD ring with 8 entries at 0x201FB8, tx_count = 0
tx_head = 0x201FD8 (4), head_txp = 0x831BF20 (4)
tx_tail = 0x201FD8 (4), tail_txp = 0x831BF20 (4)
00 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
01 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
02 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
03 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
04 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
05 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
06 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
07 pak=0x000000 buf=0x200000 status=0x20 pak_size=0
TX PD ring with 8 entries at 0x202038, tx_count = 0
tx_head_pd = 0x202838 (4)
tx_tail_pd = 0x202838 (4)
00 status=0x00 bd_index=0x0000 len=0x0000 hdr_len=0x0000
ehdr: 01 06 02 74 34 11
01 status=0x00 bd_index=0x0001 len=0x0000 hdr_len=0x0000
ehdr: 01 06 02 74 34 11
02 status=0x00 bd_index=0x0002 len=0x0000 hdr_len=0x0000
ehdr: 01 06 02 74 34 11
03 status=0x00 bd_index=0x0003 len=0x0000 hdr_len=0x0000
ehdr: 01 06 02 74 34 11
04 status=0x00 bd_index=0x0004 len=0x0000 hdr_len=0x0000
ehdr: 01 06 02 74 34 11
05 status=0x00 bd_index=0x0005 len=0x0000 hdr_len=0x0000
ehdr: 01 06 02 74 34 11
06 status=0x00 bd_index=0x0006 len=0x0000 hdr_len=0x0000
ehdr: 01 06 02 74 34 11
07 status=0x20 bd_index=0x0007 len=0x0000 hdr_len=0x0000
ehdr: 01 06 02 74 34 11
MIB Statistics
DS fifo full = 0, Rerequests = 0
DS mac msg overruns = 0, DS data overruns = 0
Qualified maps = 348, Qualified syncs = 73
CRC fails = 0, HDR chk fails = 0
Data pdus = 0, Mac msgs = 423
Valid hdrs = 423
BCM3220 Registers:
downstream dma:
ds_data_bd_base=0x001D40, ds_mac_bd_base=0x001E80
ds_data_dma_ctrl=0x98, ds_mac_dma_ctrl=0xD8
ds_dma_data_index=0x0007, ds_dma_msg_index=0x0000
upstream dma:
us_bd_base=0x001FB8, us_pd_base=0x002038
us_dma_ctrl=0x80, us_dma_tx_start=0x00
Global control and status:
global_ctrl_status=0x00
interrupts:
irq_pend=0x0008, irq_mask=0x00F7
Table 2 briefly describes some of the fields shown in the display. For more information, see the Broadcom documentation for the BCM3220 chip.
| Field | Description |
|---|---|
BCM3220 unit | The unit number of this BCM3220 chip. |
idb | Interface description block number. |
ds | Downstream channel. |
regaddr | Indicates the start of the BCM3220 registers. |
reset_mask | Indicates the bit to hit when resetting the chip. |
station address | MAC address of this uBR904 cable modem interface. |
default station address | Default MAC address assigned by the factory for this uBR904 cable modem. |
PLD VERSION | PLD version of the BCM3220 chip. |
MAC state | Current MAC state of the cable modem. |
Prev States | Number of states that have previously existed since initialization. |
MAC mcfilter | MAC control filter for MAC messages. |
data mcfilter | MAC control filter for data. |
DS | Downstream Broadcom receiver chip number and ID. |
US | Upstream Broadcom transmitter chip number and ID. |
Tuner: status | Current status of the tuner. |
Rx: tuner_freq | Downstream frequency (in Hz) that the uBR904 searched for and found. |
symbol_rate | Downstream frequency in symbols per second. |
local_freq | Frequency on which the transmitter and the tuner communicate. |
snr_estimate | Estimate of signal-to-noise ratio (SNR) in Db X 1000. |
ber_estimate | Estimate of bit error rate (always 0). |
lock_threshold | Minimum signal-to-noise ratio (SNR) that the uBR904 will accept as a valid lock. |
qam_mode | The modulation scheme used in the downstream direction. |
Tx: tx_freq | Upstream frequency sent to the uBR904 by the CMTS in the UCD message. |
power_level | Transmit power level as set in the hardware, expressed as a hexadecimal value. The units are unique to the hardware used. Use the show controllers cable-modem 0 mac state command to see the power level in dBmV. |
symbol_rate | Upstream frequency in symbols per second. |
TFTP server | IP address of the TFTP server at the headend. |
TOD server | IP address of the time-of-day server at the headend. |
Security server | IP address of the security server at the headend. |
Timezone Offset | Correction received from the DHCP server to synchronize the cable modem time clock with the CMTS. |
Config filename | Name of the file stored on the cable company's TFTP server that contains operational parameters for the cable modem. |
buffer size | Size in bytes of the BCM3220 message buffers. |
RX data PDU ring: rx_p | Indicates the memory location of the beginning of buffer information for the receive data ring. Indicates current head buffer descriptor. Indicates current head packet descriptor. |
RX MAC message ring: rx_p_mac | Indicates the memory location of the beginning of buffer information for the receive MAC message ring. Indicates current head buffer descriptor. Indicates current head packet descriptor. |
TX BD ring: tx_head tx_tail tail_txp | Indicates the memory location of the beginning of buffer information for the transmit buffer descriptor ring. If tx_count is 0, or if tx_head and tx_tail are equal and there is no change for a period of time, it means there are packets stuck on the ring. This condition may be caused by the headend not giving grants. The next packet descriptor to get used, along with its index.
The next packet descriptor to get sent, along with its index. When head_txp and tail_txp are the same, the transmit queue is empty. |
TX PD ring: tx_tail_pd ehdr | Indicates the memory location of the beginning of buffer information for the transmit packet descriptor ring. Indicates current head packet descriptor. Indicates current tail packet descriptor. Extended MCNS header. |
MIB Statistics: |
|
DS fifo full | Number of times the downstream input first-in first-out (FIFO) buffer became full on the uBR904. |
rerequests | Number of times a bandwidth request generated by the uBR904 was not responded to by the CMTS. |
DS mac msg overruns | Number of times the uBR904's DMA controller had a downstream MAC message and there were no free MAC message buffer descriptors to accept the message. |
DS data overruns | Number of times the uBR904's DMA controller had downstream data and there were no free data PDU buffer descriptors to accept the data. |
Qualified maps | Number of times a MAP message passed all filtering requirements and was received by the uBR904. |
Qualified syncs | Number of times a timestamp message was received by the uBR904. |
CRC fails | Number of times a MAC message failed a cyclic redundancy (CRC) check. |
HDR chk fails | Number of times a MAC header failed its 16-bit CRC check. The MAC header CRC is a 16-bit Header Check Sequence (HCS) field that ensures the integrity of the MAC header even in a collision environment. |
Data pdus | Total number of data PDUs (protocol data units) of all types received by the uBR904. |
Mac msgs | Number of MAC messages received by the uBR904. |
Valid hdrs | Number of valid headers received by the uBR904, including PDU headers, MAC headers, and headers only. |
Global control and status: | Used to reset the BCM3220 chip. |
interrupts: | Hexadecimal values of the pending IRQ interrupt and IRQ mask. |
show controllers cable-modem bpkm
show controllers cable-modem des
show controllers cable-modem filters
show controllers cable-modem lookup-table
show controllers cable-modem mac
show controllers cable-modem phy
show controllers cable-modem tuner
To display information about the baseline privacy key management exchange between the cable modem and the headend CMTS, use the show controllers cable-modem bpkm command in privileged EXEC mode.
show controllers cable-modem number bpkm
number | controller number inside the cable modem. |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
The following output is displayed when the headend CMTS does not have baseline privacy enabled:
uBR904# show controllers cable-modem 0 bpkm
CM Baseline Privacy Key Management
configuration (in seconds):
authorization wait time: 10
reauthorization wait time: 10
authorization grace time: 600
operational wait time: 1
rekey wait time: 1
tek grace time: 600
authorization rej wait time: 60
kek state: STATE_B_AUTH_WAIT
sid 4:
tek state: No resources assigned
Table 3 describes the fields shown in the display.
| Field | Description |
|---|---|
authorization wait time | The number of seconds the cable modem waits for a reply after sending the Authorization Request message to the CMTS. |
reauthorization wait time | The number of seconds the cable modem waits for a reply after it has sent an Authorization Request message to the CMTS in response to a reauthorization request or an Authorization Invalid message from the CMTS. |
authorization grace time | The number of seconds before the current authorization is set to expire that the grace timer begins, signaling the cable modem to begin the reauthorization process. |
operational wait time | The number of seconds the TEK state machine waits for a reply from the CMTS after sending its initial Key Request for its SID's keying material. |
rekey wait time | The number of seconds the TEK state machine waits for a replacement key for this SID after the TEK grace timer has expired and the request for a replacement key has been made. |
tek grace time | The number of seconds before the current TEK is set to expire that the TEK grace timer begins, signaling the TEK state machine to request a replacement key. |
authorization rej wait time | Number of seconds the cable modem waits before sending another Authorization Request message to the CMTS after it has received an Authorization Reject message. |
kek state | The current state of the key encryption key that the CMTS uses to encrypt the traffic encryption keys it sends to the cable modem. |
tek state | The current state of the traffic encryption key state machine for the specified SID. |
show controllers cable-modem
show controllers cable-modem des
show controllers cable-modem filters
show controllers cable-modem lookup-table
show controllers cable-modem mac
show controllers cable-modem phy
show controllers cable-modem tuner
To display information about the Data Encryption Standard (DES) engine registers, use the show controllers cable-modem des command in privileged EXEC mode.
show controllers cable-modem number des
number | controller number inside the cable modem. |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
DES engine registers are displayed in the following example:
uBR904#show controllers cable-modem 0 desdownstream des:ds_des_key_table:key 0: even 0, odd 0key 1: even 0, odd 0key 2: even 0, odd 0key 3: even 0, odd 0ds_des_cbc_iv_table:iv 0: even 0, odd 0iv 1: even 0, odd 0iv 2: even 0, odd 0iv 3: even 0, odd 0ds_des_sid_table:sid_1=0x0000, sid_2=0x0000, sid_3=0x0000, sid_4=0x0000ds_des_sid_enable=0x80, ds_des_ctrl=0x2Eds_des_sv=0x0F00ds_unencrypted_length=0x0Cupstream des:us_des_key_table:key 0: even 0, odd 0key 1: even 0, odd 0key 2: even 0, odd 0key 3: even 0, odd 0us_des_cbc_iv_table:iv 0: even 0, odd 0iv 1: even 0, odd 0iv 2: even 0, odd 0iv 3: even 0, odd 0pb_req_bytes_to_minislots=0x10us_des_ctrl=0x00, us_des_sid_1= 0x1234ds_unencrypted_length=0x0C
Table 4 briefly describes some of the fields shown in the display. For more information, see the Broadcom documentation for the BCM3220 chip.
| Field | Description |
|---|---|
ds_des_key_table | Table showing downstream DES keys. |
ds_des_cbc_iv_table | Table of downstream DES Cipher Block Chaining mode information. |
ds_des_sid_table | Table showing the SID values to be enabled for DES encryption. |
ds_des_sid_enable | Controls which SID entries in the SID table are enabled for encryption. In the above example, none of the entries are enabled for encryption. |
ds_des_ctrl | Control register that controls the operating mode of the downstream DES engine. |
ds_des_sv | DES security version register; the range of the version field in Baseline Privacy interface (BPI) extended headers that will be accepted by the hardware. High byte is upper limit, low byte is lower limit. The uBR904 will accept versions 0 to 15. |
ds_unencrypted_length | Specifies the number of bytes that will be unencrypted at the beginning of the MAC frame. 0x0C means the first 12 bytes are not encrypted, which is what the DOCSIS Baseline Privacy specification calls for. |
us_des_key_table | Table showing upstream DES keys. |
us_des_cbc_iv_table | Table of upstream DES Cipher Block Chaining mode information. |
us_des_ctrl | Control register that controls the operating mode of the upstream DES engine. The value 0x24 means that the upstream is configured to enable decryption and to use CBC mode |
show controllers cable-modem
show controllers cable-modem bpkm
show controllers cable-modem filters
show controllers cable-modem lookup-table
show controllers cable-modem mac
show controllers cable-modem phy
show controllers cable-modem tuner
To display the registers in the MAC hardware that are used for filtering received frames, use the show controllers cable-modem filters command in privileged EXEC mode.
show controllers cable-modem number filters
number | Controller number inside the cable modem. |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
Some of the filtering parameters are MAC hardware addresses, Service IDs (SIDs), and upstream channel IDs.
MAC and SID filter information is displayed in the following example:
uBR904#show controllers cable-modem 0 filtersdownstream mac message processing:ds_mac_da_filters:filter_1=0010.7b43.aa01, filter_2=0000.0000.0000filter_3=0000.0000.0000, filter_4=0000.0000.0000ds_mac_da_filter_ctrl=0x71, ds_mac_msg_sof=0x0000ds_mac_da_mc=01E02F00map_parser_sids:sid_1=0x0000, sid_2=0x0000, sid_3=0x0000, sid_4=0x0000ds_mac_filter_ctrl=0x00, us_channel_id=0x0000ds_pid=0x0000, mac_msg_proto_ver=FF 00reg_rang_req_sid=0x0000downstream data processing:ds_data_da_filter_table:filter_1 0010.7b43.aa01, filter_2 0000.0000.0000filter_3 0000.0000.0000, filter_4 0000.0000.0000ds_data_da_filter_ctrl=0x61, ds_pdu_sof=0xDEADds_data_da_mc=01000000upstream processing:us_ctrl_status=0x04, Minislots per request=0x01burst_maps:map[0]=0 map[1]=0 map[2]=0 map[3]=0bytes_per_minislot_exp=0x04us_map_parser_minislot_adv=0x03, ticks_per_minislot=0x08, maint_xmit=0x0001us_sid_table:sid_1=0x0000, sid_2=0x0000, sid_3=0x0000, sid_4=0x0000max_re_req=0x0010, rang_fifo=0x00
Table 5 briefly describes some of the fields shown in the display. For more information, see the Broadcom documentation for the BCM3220 chip.
| Field | Description |
|---|---|
ds_mac_da_filters | Shows the MAC address of the cable interface and the MAC address of any Ethernet MAC it is bridging. |
ds_mac_da_filter_ctrl | Downstream MAC filter control for data. |
ds_mac_msg_sof | Downstream MAC message start of frame. |
ds_mac_da_mc | Downstream MAC control filter for data. |
map_parser_sids | Service IDs used for upstream bandwidth allocation. |
ds_mac_filter_ctrl | Downstream MAC filter control for MAC messages. |
us_channel_id | Upstream channel ID. |
ds_pid | Downstream packet ID |
mac_msg_proto_ver | Version of the MAC management protocol in use. |
reg_rang_req_sid | Service ID (SID) field of the ranging request message. |
ds_data_da_filter_table | Downstream data processing filter table. |
ds_data_da_filter_ctrl | Downstream data processing filter control. |
ds_pdu_sof | Downstream PDU start of frame. |
ds_data_da_mc | Downstream data processing MAC control. |
us_ctrl_status | Upstream control status. |
Minislots per request | Length of each registration request in mini-slots. |
burst_maps | Map the burst profiles saved in the BCM3037 registers to interval usage codes (IUCs). |
bytes_per_minislot_exp | Number of bytes per expansion mini-slot. |
ticks_per_minislot | Number of time ticks (6.25-microsecond intervals) in each upstream mini-slot. |
maint_xmit | Number of initial maintenance transmit opportunities. |
us_sid_table | Upstream service ID table. |
max_re_req | Maximum number of registration re-requests allowed. |
rang_fifo | Number of ranging requests that can be held in the first-in-first-out buffer. |
show controllers cable-modem
show controllers cable-modem bpkm
show controllers cable-modem des
show controllers cable-modem lookup-table
show controllers cable-modem mac
show controllers cable-modem phy
show controllers cable-modem tuner
To display the mini-slot lookup table inside a cable modem, use the show controllers cable-modem lookup-table command in privileged EXEC mode.
show controllers cable-modem number lookup-table
number | Controller number inside the cable modem. |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
This command shows the details of the lookup table. The driver uses this table to convert the size of a packet that the cable modem wants to transmit into a bandwidth request to the CMTS in mini-slots. The contents of this table are affected by the upstream symbol rate that is negotiated between the CMTS and the cable modem.
Use this table to look up the packet size and determine how many mini-slots will be needed.
The lookup table is displayed in the following example:
uBR904# show controllers cable-modem 0 lookup-table
Max Burst Size (minislots) = 0x6
Max Burst Length (bytes) = 0x4B
PHY Overhead Lookup Table:
000: 01 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06
010: 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06
020: 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06
030: 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06
040: 06 06 06 06 06 06 06 06 06 06 06 06 10 10 10 10
050: 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
060: 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
070: 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
080: 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
090: 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
0A0: 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
0B0: 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
0C0: 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
0D0: 10 10 10 10 10 10 10 10 10 10 10 10 10 1F 1F 1F
0E0: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
0F0: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
100: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
110: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
120: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
130: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
140: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
150: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
160: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
170: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
180: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
190: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
1A0: 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F
1B0: 1F 1F 1F 1F 1F 1F 1F 1F 1F 2D 2D 2D 2D 2D 2D 2D
1C0: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
1D0: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
1E0: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
1F0: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
200: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
210: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
220: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
230: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
240: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
250: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
260: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
270: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
280: 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D
290: 2D 2D 2D 2D 2D 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
2A0: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
2B0: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
2C0: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
2D0: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
2E0: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
2F0: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
300: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
310: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
320: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
330: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
340: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
350: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
360: 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C
370: 3C 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
380: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
390: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
3A0: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
3B0: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
3C0: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
3D0: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
3E0: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
3F0: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
400: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
410: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
420: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
430: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B
440: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A
450: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
460: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
470: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
480: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
490: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
4A0: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
4B0: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
4C0: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
4D0: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
4E0: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
4F0: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
500: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
510: 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
520: 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68
530: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
540: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
550: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
560: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
570: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
580: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
590: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
5A0: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
5B0: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
5C0: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
5D0: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
5E0: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
5F0: 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68
600: 68 68 68 68 68 77 77 77 77 77 77 77 77 77 77 77
610: 77 77 77 77 77 77 77 77 77 77 77 77 77 77 77 77
620: 77 77 77 77 77 77 77 77 77 77 77 77 77 77 77 77
630: 77 77 77 77 77 77 77 77 77 77 77 77 77 77 77 77
PHY Reverse Lookup Table:
00: 0000 0000 0000 0000 0000 0000 004B 0000
08: 0000 0000 0000 0000 0000 0000 0000 0000
10: 00DC 00DC 00DC 00DC 00DC 00DC 00DC 00DC
18: 00DC 00DC 00DC 00DC 00DC 00DC 00DC 01B8
20: 01B8 01B8 01B8 01B8 01B8 01B8 01B8 01B8
28: 01B8 01B8 01B8 01B8 01B8 0294 0294 0294
30: 0294 0294 0294 0294 0294 0294 0294 0294
38: 0294 0294 0294 0294 0370 0370 0370 0370
40: 0370 0370 0370 0370 0370 0370 0370 0370
48: 0370 0370 0370 044C 044C 044C 044C 044C
50: 044C 044C 044C 044C 044C 044C 044C 044C
58: 044C 044C 0528 0528 0528 0528 0528 0528
60: 0528 0528 0528 0528 0528 0528 0528 0528
68: 0604 0604 0604 0604 0604 0604 0604 0604
70: 0604 0604 0604 0604 0604 0604 0604 06E0
78: 06E0 06E0 06E0 06E0 06E0 06E0 06E0 06E0
80: 06E0 06E0 06E0 06E0 06E0 06E0 07BC 07BC
88: 07BC 07BC 07BC 07BC 07BC 07BC 07BC 07BC
90: 07BC 07BC 07BC 07BC 07BC 0898 0898 0898
98: 0898 0898 0898 0898 0898 0898 0898 0898
A0: 0898 0898 0898 0974 0974 0974 0974 0974
A8: 0974 0974 0974 0974 0974 0974 0974 0974
B0: 0974 0974 0A50 0A50 0A50 0A50 0A50 0A50
B8: 0A50 0A50 0A50 0A50 0A50 0A50 0A50 0A50
C0: 0A50 0B2C 0B2C 0B2C 0B2C 0B2C 0B2C 0B2C
C8: 0B2C 0B2C 0B2C 0B2C 0B2C 0B2C 0B2C 0B2C
D0: 0C08 0C08 0C08 0C08 0C08 0C08 0C08 0C08
D8: 0C08 0C08 0C08 0C08 0C08 0C08 0CE4 0CE4
E0: 0CE4 0CE4 0CE4 0CE4 0CE4 0CE4 0CE4 0CE4
E8: 0CE4 0CE4 0CE4 0CE4 0CE4 0DC0 0DC0 0DC0
F0: 0DC0 0DC0 0DC0 0DC0 0DC0 0DC0 0DC0 0DC0
F8: 0DC0 0DC0 0DC0 0DC0 0E9C 0E9C 0E9C 0E9C
show controllers cable-modem
show controllers cable-modem bpkm
show controllers cable-modem des
show controllers cable-modem filters
show controllers cable-modem mac
show controllers cable-modem phy
show controllers cable-modem tuner
To show detailed MAC-layer information for a cable modem, enter the show controllers cable-modem mac command in privileged EXEC mode.
show controllers cable-modem number mac [errors | hardware | log | resets | state]
number | The controller number inside the cable modem. |
errors | (Optional) Displays a log of the error events that are reported to SNMP. This keyword gives you a way of looking at the error events without using a MIB. |
hardware | (Optional) Displays all MAC hardware registers. |
log | (Optional) Displays a history of MAC log messages, up to 1023 entries. This is the same output that is displayed when the debug cable-modem mac log command is entered. |
resets | (Optional) Extracts all the reset causes out of the MAC log file and summarizes them into a mini report. |
state | (Optional) Displays a summary of the MAC state. |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
MAC log messages are written to a circular log file even when debugging is not turned on. These messages include timestamps, events, and information pertinent to these events. Enter the show controllers cable-modem mac log command to view MAC log messages.
If the cable modem interface fails to come up or resets periodically, the MAC log will capture what happened. For example, if an address is not obtained from the DHCP server, an error is logged, initialization starts over, and the cable modem scans for a downstream frequency.
The most useful keywords for troubleshooting a cable modem are log, errors, and resets. See Example 1, Example 2, and Example 3.
The following sample display shows the MAC log file for a cable-modem interface that has successfully come up:
uBR904# show controllers cable-modem 0 mac log *Mar 7 01:42:59: 528302.040 CMAC_LOG_LINK_DOWN *Mar 7 01:42:59: 528302.042 CMAC_LOG_RESET_FROM_DRIVER *Mar 7 01:42:59: 528302.044 CMAC_LOG_STATE_CHANGE wait_for_link_up_state *Mar 7 01:42:59: 528302.046 CMAC_LOG_DRIVER_INIT_IDB_SHUTDOWN 0x08098D02 *Mar 7 01:42:59: 528302.048 CMAC_LOG_LINK_DOWN *Mar 7 01:43:05: 528308.428 CMAC_LOG_DRIVER_INIT_IDB_RESET 0x08098E5E *Mar 7 01:43:05: 528308.432 CMAC_LOG_LINK_DOWN *Mar 7 01:43:05: 528308.434 CMAC_LOG_LINK_UP *Mar 7 01:43:05: 528308.436 CMAC_LOG_STATE_CHANGE ds_channel_scanning_state *Mar 7 01:43:05: 528308.440 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 88/453000000/855000000/6000000 *Mar 7 01:43:05: 528308.444 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 89/93000000/105000000/6000000 *Mar 7 01:43:05: 528308.448 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 90/111250000/117250000/6000000 *Mar 7 01:43:05: 528308.452 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 91/231012500/327012500/6000000 *Mar 7 01:43:05: 528308.456 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 92/333015000/333015000/6000000 *Mar 7 01:43:05: 528308.460 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 93/339012500/399012500/6000000 *Mar 7 01:43:05: 528308.462 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 94/405000000/447000000/6000000 *Mar 7 01:43:05: 528308.466 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 95/123015000/129015000/6000000 *Mar 7 01:43:05: 528308.470 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 96/135012500/135012500/6000000 *Mar 7 01:43:05: 528308.474 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 97/141000000/171000000/6000000 *Mar 7 01:43:05: 528308.478 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 98/219000000/225000000/6000000 *Mar 7 01:43:05: 528308.482 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 99/177000000/213000000/6000000 *Mar 7 01:43:05: 528308.486 CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY 663000000 *Mar 7 01:43:05: 528308.488 CMAC_LOG_WILL_SEARCH_USER_DS_FREQUENCY 663000000 *Mar 7 01:43:07: 528310.292 CMAC_LOG_DS_64QAM_LOCK_ACQUIRED 663000000 *Mar 7 01:43:07: 528310.294 CMAC_LOG_DS_CHANNEL_SCAN_COMPLETED *Mar 7 01:43:07: 528310.296 CMAC_LOG_STATE_CHANGE wait_ucd_state *Mar 7 01:43:08: 528310.892 CMAC_LOG_UCD_MSG_RCVD 4 *Mar 7 01:43:08: 528310.896 CMAC_LOG_UCD_NEW_US_FREQUENCY 20000000 *Mar 7 01:43:08: 528310.898 CMAC_LOG_SLOT_SIZE_CHANGED 8 *Mar 7 01:43:08: 528310.970 CMAC_LOG_FOUND_US_CHANNEL 1 *Mar 7 01:43:08: 528310.974 CMAC_LOG_STATE_CHANGE wait_map_state *Mar 7 01:43:08: 528311.394 CMAC_LOG_MAP_MSG_RCVD *Mar 7 01:43:08: 528311.396 CMAC_LOG_INITIAL_RANGING_MINISLOTS 40 *Mar 7 01:43:08: 528311.400 CMAC_LOG_STATE_CHANGE ranging_1_state *Mar 7 01:43:08: 528311.402 CMAC_LOG_RANGING_OFFSET_SET_TO 9610 *Mar 7 01:43:08: 528311.404 CMAC_LOG_POWER_LEVEL_IS 8.0 dBmV (commanded) *Mar 7 01:43:08: 528311.406 CMAC_LOG_STARTING_RANGING *Mar 7 01:43:08: 528311.408 CMAC_LOG_RANGING_BACKOFF_SET 0 *Mar 7 01:43:08: 528311.412 CMAC_LOG_RNG_REQ_QUEUED 0 *Mar 7 01:43:09: 528311.900 CMAC_LOG_RNG_REQ_TRANSMITTED *Mar 7 01:43:09: 528312.102 CMAC_LOG_T3_TIMER *Mar 7 01:43:12: 528314.622 CMAC_LOG_POWER_LEVEL_IS 20.0 dBmV (commanded) *Mar 7 01:43:12: 528314.624 CMAC_LOG_RANGING_BACKOFF_SET 2 *Mar 7 01:43:12: 528314.628 CMAC_LOG_RNG_REQ_QUEUED 0 *Mar 7 01:43:13: 528315.928 CMAC_LOG_RNG_REQ_TRANSMITTED *Mar 7 01:43:13: 528315.932 CMAC_LOG_RNG_RSP_MSG_RCVD *Mar 7 01:43:13: 528315.934 CMAC_LOG_RNG_RSP_SID_ASSIGNED 4 *Mar 7 01:43:13: 528315.936 CMAC_LOG_ADJUST_RANGING_OFFSET 2849 *Mar 7 01:43:13: 528315.938 CMAC_LOG_RANGING_OFFSET_SET_TO 12459 *Mar 7 01:43:13: 528315.940 CMAC_LOG_ADJUST_TX_POWER 20 *Mar 7 01:43:13: 528315.942 CMAC_LOG_POWER_LEVEL_IS 25.0 dBmV (commanded) *Mar 7 01:43:13: 528315.944 CMAC_LOG_STATE_CHANGE ranging_2_state *Mar 7 01:43:13: 528315.948 CMAC_LOG_RNG_REQ_QUEUED 4 *Mar 7 01:43:14: 528316.942 CMAC_LOG_RNG_REQ_TRANSMITTED *Mar 7 01:43:14: 528316.944 CMAC_LOG_RNG_RSP_MSG_RCVD *Mar 7 01:43:14: 528316.946 CMAC_LOG_ADJUST_TX_POWER 20 *Mar 7 01:43:14: 528316.950 CMAC_LOG_POWER_LEVEL_IS 30.0 dBmV (commanded) *Mar 7 01:43:14: 528316.952 CMAC_LOG_RANGING_CONTINUE *Mar 7 01:43:15: 528317.956 CMAC_LOG_RNG_REQ_TRANSMITTED *Mar 7 01:43:15: 528317.958 CMAC_LOG_RNG_RSP_MSG_RCVD *Mar 7 01:43:15: 528317.960 CMAC_LOG_ADJUST_TX_POWER 14 *Mar 7 01:43:15: 528317.962 CMAC_LOG_POWER_LEVEL_IS 34.0 dBmV (commanded) *Mar 7 01:43:15: 528317.964 CMAC_LOG_RANGING_CONTINUE *Mar 7 01:43:16: 528318.968 CMAC_LOG_RNG_REQ_TRANSMITTED *Mar 7 01:43:16: 528318.970 CMAC_LOG_RNG_RSP_MSG_RCVD *Mar 7 01:43:16: 528318.974 CMAC_LOG_RANGING_SUCCESS *Mar 7 01:43:16: 528318.976 CMAC_LOG_STATE_CHANGE dhcp_state *Mar 7 01:43:16: 528318.978 DHCP_COMPLETE *Mar 7 01:43:16: 528318.980 CMAC_LOG_STATE_CHANGE establish_tod_state *Mar 7 01:43:16: 528318.982 CMAC_LOG_TOD_COMPLETE *Mar 7 01:43:16: 528318.984 CMAC_LOG_STATE_CHANGE security_association_state *Mar 7 01:43:16: 528318.986 CMAC_LOG_SECURITY_BYPASSED *Mar 7 01:43:16: 528318.988 CMAC_LOG_STATE_CHANGE configuration_file_state *Mar 7 01:43:16: 528318.992 CMAC_LOG_CONFIG_FILE_PROCESS_COMPLETE *Mar 7 01:43:16: 528319.028 CMAC_LOG_STATE_CHANGE registration_state *Mar 7 01:43:16: 528319.030 CMAC_LOG_REG_REQ_MSG_QUEUED *Mar 7 01:43:16: 528319.036 CMAC_LOG_REG_REQ_TRANSMITTED *Mar 7 01:43:16: 528319.038 CMAC_LOG_REG_RSP_MSG_RCVD *Mar 7 01:43:16: 528319.040 CMAC_LOG_COS_ASSIGNED_SID 1/4 *Mar 7 01:43:16: 528319.044 CMAC_LOG_RNG_REQ_QUEUED 4 *Mar 7 01:43:16: 528319.046 CMAC_LOG_REGISTRATION_OK *Mar 7 01:43:16: 528319.048 CMAC_LOG_STATE_CHANGE establish_privacy_state *Mar 7 01:43:16: 528319.052 CMAC_LOG_STATE_CHANGE maintenance_state
If the DHCP server could not be reached, the error would look like this in the MAC log:
497959.800 CMAC_LOG_STATE_CHANGE dhcp_state 497969.864 CMAC_LOG_RNG_REQ_TRANSMITTED 497969.866 CMAC_LOG_RNG_RSP_MSG_RCVD 497979.936 CMAC_LOG_RNG_REQ_TRANSMITTED 497979.938 CMAC_LOG_RNG_RSP_MSG_RCVD 497989.802 CMAC_LOG_WATCHDOG_TIMER 497989.804 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED 497989.804 CMAC_LOG_STATE_CHANGE reset_interface_state 497989.806 CMAC_LOG_DHCP_PROCESS_KILLED
The fields in this display are explained in the "Step 4Interpret the MAC Log File and Take Action" section.
MAC error log information is displayed in the following example, which is also reported via SNMP:
uBR904# show controllers cable-modem 0 mac errors 74373.574 R02.0 No Ranging Response received. T3 time-out. 74374.660 R02.0 No Ranging Response received. T3 time-out. 74375.508 R02.0 No Ranging Response received. T3 time-out. 74375.748 R02.0 No Ranging Response received. T3 time-out. 74375.748 R03.0 Ranging Request Retries exhausted. 74376.112 R02.0 No Ranging Response received. T3 time-out. 74376.354 R02.0 No Ranging Response received. T3 time-out. 74376.778 R02.0 No Ranging Response received. T3 time-out. 74377.442 R02.0 No Ranging Response received. T3 time-out.
This output indicates that the cable modem acquired a downstream lock, successfully read a UCD, and successfully read a MAP. However, it was unable to communicate with the CMTS after ranging through all upstream transmit power levels (from 8 dBmv to 61 dBmv). The cable modem tried to communicate with the CMTS 16 times without success, after which it reset the cable interface to try to find a better downstream frequency.
If the DHCP server could not be reached, the error would look like this in the MAC error display:
uBR904# show controllers cable-modem 0 mac errors 497989.804 D01.0 Discover sent no Offer received. No available DHCP Server. 498024.046 D01.0 Discover sent no Offer received. No available DHCP Server. 498058.284 D01.0 Discover sent no Offer received. No available DHCP Server.
The show controllers cable-modem 0 mac resets command shows only the entries in the MAC log that begin with the field CMAC_LOG_RESET. Collectively presenting these fields provides you with a summary of the most recent reasons why the cable interface was reset.
Reset messages and brief explanations are included in the following examples and in Table 6; however, the reset messages in Table 6 do not commonly occur.
In the following example, the configuration file downloaded from the TFTP server could not be read. The file might not exist, or the file might have incorrect permissions.
uBR904# show controllers cable-modem 0 mac resets 62526.114 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED 62564.368 CMAC_LOG_RESET_T4_EXPIRED 62677.178 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED 62717.462 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED 62757.746 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED 62796.000 CMAC_LOG_RESET_T4_EXPIRED 62908.808 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED 62949.092 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED 62989.380 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED 63029.662 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED 63069.944 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED 63110.228 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED 63148.484 CMAC_LOG_RESET_T4_EXPIRED 63261.296 CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
The following example shows that the DHCP server could not be reached. The DHCP server took too long to respond.
uBR904# show controllers cable-modem 0 mac resets 497989.804 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED 498024.046 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED 498058.284 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED
The following example indicates that an event in the cable interface driver caused the interface to reset. This often occurs because a shut or clear command is currently being issued on the interface.
uBR904# show controllers cable-modem 0 mac resets 527986.444 CMAC_LOG_RESET_FROM_DRIVER 528302.042 CMAC_LOG_RESET_FROM_DRIVER 528346.600 CMAC_LOG_RESET_FROM_DRIVER 528444.494 CMAC_LOG_RESET_FROM_DRIVER
| Message | Description |
|---|---|
| The format of the DOCSIS configuration file acquired from the TFTP server is not acceptable. |
| Synchronization with the CMTS has been lost (SYNC messages are not being received). |
| Maintenance ranging opportunities for this cable modem are not being received from the CMTS. |
| The DHCP server took too long to respond. |
| The Time Of Day server took too long to respond. |
| The baseline privacy exchange with the CMTS took too long. |
| The cable modem was unable to transmit a response to a UCC-REQ message. |
| The "full security" exchange with the CMTS took too long. |
| The TFTP server took too long to respond. |
| All downstream frequencies to be searched have been searched. This message indicates that downstream frequencies were found and the cable modem failed. |
| Initial ranging opportunities are not being received. |
| The CMTS failed too many times to respond to a RNG-REQ message. |
| The CMTS commanded the cable modem to abort the ranging process. |
| The cable modem has run out of memory. |
| The cable modem was unable to start an internal process necessary to complete ranging and registration. |
| The reading of the configuration file from the TFTP server failed. The file might not exist, or it might have incorrect permissions. |
| The cable modem failed authentication as indicated in a REG-RSP message from the CMTS. |
| The CMTS has failed the cable modem's registration because a required or requested class of service is not available. |
| The CMTS failed too many times to respond to a REG-REQ message. |
| The cable modem MAC layer failed to detect a change in the interface driver. |
| The Network Access parameter was missing from the DOCSIS configuration file. |
| The cable modem was unable to set the Write Access Control for an SNMP parameter, as specified by the DOCSIS configuration file. |
| The DHCP server did not respond with all the required values. The required values are: IP address, network mask, TFTP server IP address, TOD server IP address, DOCSIS configuration file name, and time zone offset. |
| The cable modem was unable to start the internal process used to manage the downstream tuner. |
| Downstream QAM/FEC lock has been lost too many times. |
| The cable modem MAC-layer process was unable to communicate with the downstream tuner management process. |
| The downstream tuner process failed to report its continuing operation for a long period of time. |
| The cable modem was unable to set an SNMP parameter as specified by the DOCSIS configuration file. |
| The internal MIB object took too long to process the entries in the DOCSIS configuration file. |
The following example display for the show controllers cable-modem 0 mac hardware command shows the detailed configuration of the interface driver and MAC-layer hardware. The most interesting bit is the station address (hardware address). The MIB statistics reflect the MAC hardware counters for various events, but these counters are typically reset every few seconds, so their contents are not accurate in this display.
uBR904# show controllers cable-modem 0 mac hardware
PLD VERSION: 32
BCM3220 unit 0, idb 0x200EB4, ds 0x82D4748, regaddr = 0x800000, reset_mask
0x80
station address 0010.7b43.aa01 default station address 0010.7b43.aa01
MAC mcfilter 01E02F00 data mcfilter 01000000
buffer size 1600
RX data PDU ring with 32 entries at 0x201D40
rx_head = 0x201D40 (0), rx_p = 0x82D4760 (0)
00 pak=0x82DF844 buf=0x227F1A status=0x80 pak_size=0
01 pak=0x82E0BF4 buf=0x22C56A status=0x80 pak_size=0
02 pak=0x82DF454 buf=0x22710A status=0x80 pak_size=0
03 pak=0x82DF64C buf=0x227812 status=0x80 pak_size=0
04 pak=0x82E0024 buf=0x229B3A status=0x80 pak_size=0
05 pak=0x82DBF2C buf=0x21B332 status=0x80 pak_size=0
06 pak=0x82DFE2C buf=0x229432 status=0x80 pak_size=0
07 pak=0x82E0FE4 buf=0x22D37A status=0x80 pak_size=0
08 pak=0x82DF064 buf=0x2262FA status=0x80 pak_size=0
09 pak=0x82DEC74 buf=0x2254EA status=0x80 pak_size=0
10 pak=0x82DEA7C buf=0x224DE2 status=0x80 pak_size=0
11 pak=0x82DE884 buf=0x2246DA status=0x80 pak_size=0
12 pak=0x82DE68C buf=0x223FD2 status=0x80 pak_size=0
13 pak=0x82DE494 buf=0x2238CA status=0x80 pak_size=0
14 pak=0x82DE29C buf=0x2231C2 status=0x80 pak_size=0
15 pak=0x82DE0A4 buf=0x222ABA status=0x80 pak_size=0
16 pak=0x82DDEAC buf=0x2223B2 status=0x80 pak_size=0
17 pak=0x82DDCB4 buf=0x221CAA status=0x80 pak_size=0
18 pak=0x82DDABC buf=0x2215A2 status=0x80 pak_size=0
19 pak=0x82DD8C4 buf=0x220E9A status=0x80 pak_size=0
20 pak=0x82DD6CC buf=0x220792 status=0x80 pak_size=0
21 pak=0x82DD4D4 buf=0x22008A status=0x80 pak_size=0
22 pak=0x82DD2DC buf=0x21F982 status=0x80 pak_size=0
23 pak=0x82DD0E4 buf=0x21F27A status=0x80 pak_size=0
24 pak=0x82DCEEC buf=0x21EB72 status=0x80 pak_size=0
25 pak=0x82DCCF4 buf=0x21E46A status=0x80 pak_size=0
26 pak=0x82DCAFC buf=0x21DD62 status=0x80 pak_size=0
27 pak=0x82DC904 buf=0x21D65A status=0x80 pak_size=0
28 pak=0x82DC70C buf=0x21CF52 status=0x80 pak_size=0
29 pak=0x82DC514 buf=0x21C84A status=0x80 pak_size=0
30 pak=0x82DC31C buf=0x21C142 status=0x80 pak_size=0
31 pak=0x82DC124 buf=0x21BA3A status=0xA0 pak_size=0
RX MAC message ring with 8 entries at 0x201E80
rx_head_mac = 0x201EB0 (6), rx_p_mac = 0x82D480C (6)
00 pak=0x82E0DEC buf=0x22CC72 status=0x80 pak_size=0
01 pak=0x82E021C buf=0x22A242 status=0x80 pak_size=0
02 pak=0x82E060C buf=0x22B052 status=0x80 pak_size=0
03 pak=0x82E11DC buf=0x22DA82 status=0x80 pak_size=0
04 pak=0x82DFC34 buf=0x228D2A status=0x80 pak_size=0
05 pak=0x82E09FC buf=0x22BE62 status=0x80 pak_size=0
06 pak=0x82DEE6C buf=0x225BF2 status=0x80 pak_size=0
07 pak=0x82DFA3C buf=0x228622 status=0xA0 pak_size=0
TX BD ring with 8 entries at 0x201FB8, tx_count = 0
tx_head = 0x201FB8 (0), head_txp = 0x82D4888 (0)
tx_tail = 0x201FB8 (0), tail_txp = 0x82D4888 (0)
00 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
01 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
02 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
03 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
04 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
05 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
06 pak=0x000000 buf=0x200000 status=0x00 pak_size=0
07 pak=0x000000 buf=0x200000 status=0x20 pak_size=0
TX PD ring with 8 entries at 0x202038, tx_count = 0
tx_head_pd = 0x202038 (0)
tx_tail_pd = 0x202038 (0)
00 status=0x00 bd_index=0x0000 len=0x0000 hdr_len=0x0000
ehdr: 00 00 00 2E FF FF
01 status=0x00 bd_index=0x0001 len=0x0000 hdr_len=0x0000
ehdr: 00 00 00 2E FF FF
02 status=0x00 bd_index=0x0002 len=0x0000 hdr_len=0x0000
ehdr: 00 00 00 2E FF FF
03 status=0x00 bd_index=0x0003 len=0x0000 hdr_len=0x0000
ehdr: 00 00 00 2E FF FF
04 status=0x00 bd_index=0x0004 len=0x0000 hdr_len=0x0000
ehdr: 00 00 00 2E 00 00
05 status=0x00 bd_index=0x0005 len=0x0000 hdr_len=0x0000
ehdr: 00 00 00 2E 00 00
06 status=0x00 bd_index=0x0006 len=0x0000 hdr_len=0x0000
ehdr: 00 00 00 00 00 00
07 status=0x20 bd_index=0x0007 len=0x0000 hdr_len=0x0000
ehdr: 00 00 00 00 00 00
MIB Statistics
DS fifo full = 0, Rerequests = 0
DS mac msg overruns = 0, DS data overruns = 0
Qualified maps = 0, Qualified syncs = 0
CRC fails = 0, HDR chk fails = 0
Data pdus = 0, Mac msgs = 0
Valid hdrs = 0
BCM3220 Registers:
downstream dma:
ds_data_bd_base=0x001D40, ds_mac_bd_base=0x001E80
ds_data_dma_ctrl=0x98, ds_mac_dma_ctrl=0x98
ds_dma_data_index=0x0000, ds_dma_msg_index=0x0000
upstream dma:
us_bd_base=0x001FB8, us_pd_base=0x002038
us_dma_ctrl=0x00, us_dma_tx_start=0x00
global control and status:
global_ctrl_status=0x00
interrupts:
irq_pend=0x0018, irq_mask=0x00E7
timing recovery circuit:
loop_enable=0x00, minislot_divisor=0x00
K0_ctrl=0x06, K1_ctrl=0x07, acq_threshhold=0x01
err_threshhold=0x04, timeout_threshold=0xFF
nco_bias=0x4F7004F7, ranging_offset=0x00000000
ts_err=0x00, sync_valid=0x00, delta_F=0x00
timeout_err=0x00
spi:
dynamic_ctrl=0x09, static_ctr=0x9F, autonomous=0x01
irq_ack=0x00, spi_cmd=0x51, spi_addr=0x11
spi_data= FF/00/00/00/00/00/00
burst profiles:
profile 0:
01 19 1D 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
profile 1:
01 19 1D 03 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
profile 2:
01 19 1D 04 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
profile 3:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Most of the fields in this display are described in Table 2, Show Controllers Cable-Modem Field Descriptions. Table 7 describes the MIB statistics shown in the display.
| Field | Description |
|---|---|
DS fifo full | Number of times the downstream receive buffer on the cable modem became full. |
Rerequests | Number of registration requests sent by the cable modem to the CMTS. |
DS mac msg overruns | Number of times the DMA controller had a downstream MAC message and there were no free MAC message buffer descriptors to accept the message. |
DS data overruns | Number of times the DMA controller had downstream data and there were no free data PDU buffer descriptors to accept the data. |
Qualified maps | Number of valid MAP messages received by the cable modem. |
Qualified syncs | Number of times the cable modem received synchronization with the downstream channel. |
CRC fails | Number of cyclic redundancy checksums generated by the far-end device that do not match the checksums calculated from the message portions of the packets received. |
HDR check fails | Number of cyclic redundancy checksums generated by the far-end device that do not match the checksums calculated from the MAC headers of the packets received. The MAC header CRC is a 16-bit Header Check Sequence (HCS) field that ensures the integrity of the MAC header even in a collision environment. |
Data pdus | Total number of data PDUs (protocol data units) of all types received by the cable interface. |
Mac msgs | Number of MAC messages received by the cable interface. |
Valid hdrs | Number of valid MAC headers received by the cable interface. |
Below the MIB statistics in the display, the BCM3220 registers section shows the DMA locations of the indicated processing routines of the Broadcom 3220 MAC chip within the Cisco uBR904.
The show controllers cable-modem mac state command summarizes the state of the cable MAC layer. If the cable MAC layer is in the wait_for_link_up_state, the information shown in the display corresponds to the last time the interface was up. This allows useful information to be acquired from this display even though the modem has not been able to range and register. The normal operational state of the interface is the maintenance_state.
uBR904# show controller cable-modem 0 mac state
MAC State: maintenance_state
Ranging SID: 5
Registered: TRUE
Privacy Established: TRUE
MIB Values:
Mac Resets: 0
Sync lost: 0
Invalid Maps: 0
Invalid UCDs: 0
Invalid Rng Rsp: 0
Invalid Reg Rsp: 0
T1 Timeouts: 0
T2 Timeouts: 0
T3 Timeouts: 4
T4 Timeouts: 0
Range Aborts: 0
DS ID: 1
DS Frequency: 663000000
DS Symbol Rate: 5056941
DS QAM Mode 64QAM
DS Search:
88 453000000 855000000 6000000
89 93000000 105000000 6000000
90 111250000 117250000 6000000
91 231012500 327012500 6000000
92 333015000 333015000 6000000
93 339012500 399012500 6000000
94 405000000 447000000 6000000
95 123015000 129015000 6000000
96 135012500 135012500 6000000
97 141000000 171000000 6000000
98 219000000 225000000 6000000
99 177000000 213000000 6000000
US ID: 1
US Frequency: 20000000
US Power Level: 34.0 (dBmV)
US Symbol Rate: 1280000
Ranging Offset: 12460
Mini-Slot Size: 8
Change Count: 4
Preamble Pattern: CC CC CC CC CC CC CC CC CC CC CC CC CC CC 0D 0D
A9 17 D9 C3 52 2F B3 86 A4 5F 67 0D 48 BE CE 1A
91 7D 9C 35 22 FB 38 6A 45 F6 70 D4 8B EC E1 A9
17 D9 C3 52 2F B3 86 A4 5F 67 0D 48 BE CE 1A 91
F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3
F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 33 F7 33 F7
88 84 04 4C C4 84 C0 0C 44 08 08 CC 8C 0C 80 48
88 40 44 CC 48 4C 00 C4 40 80 8C C8 C0 C8 04 88
Burst Descriptor 0:
Interval Usage Code: 1
Modulation Type: 1
Differential Encoding: 2
Preamble Length: 64
Preamble Value Offset: 56
FEC Error Correction: 0
FEC Codeword Info Bytes: 16
Scrambler Seed: 338
Maximum Burst Size: 1
Guard Time Size: 8
Last Codeword Length: 1
Scrambler on/off: 1
Burst Descriptor 1:
Interval Usage Code: 3
Modulation Type: 1
Differential Encoding: 2
Preamble Length: 128
Preamble Value Offset: 0
FEC Error Correction: 5
FEC Codeword Info Bytes: 34
Scrambler Seed: 338
Maximum Burst Size: 0
Guard Time Size: 48
Last Codeword Length: 1
Scrambler on/off: 1
Burst Descriptor 2:
Interval Usage Code: 4
Modulation Type: 1
Differential Encoding: 2
Preamble Length: 128
Preamble Value Offset: 0
FEC Error Correction: 5
FEC Codeword Info Bytes: 34
Scrambler Seed: 338
Maximum Burst Size: 0
Guard Time Size: 48
Last Codeword Length: 1
Scrambler on/off: 1
Burst Descriptor 3:
Interval Usage Code: 5
Modulation Type: 1
Differential Encoding: 2
Preamble Length: 72
Preamble Value Offset: 48
FEC Error Correction: 5
FEC Codeword Info Bytes: 75
Scrambler Seed: 338
Maximum Burst Size: 0
Guard Time Size: 8
Last Codeword Length: 1
Scrambler on/off: 1
Config File:
Network Access: TRUE
Vendor ID: 0.240.30
Baseline Privacy:
Auth. Wait Timeout: 10
Reauth. Wait Timeout: 10
Auth. Grace Time: 600
Op. Wait Timeout: 1
Retry Wait Timeout: 1
TEK Grace Time: 600
Auth. Reject Wait Time: 60
COS 1:
Assigned SID: 5
Max Downstream Rate: 4000000
Max Upstream Rate: 2000000
Upstream Priority: 7
Min Upstream Rate: 100000
Max Upstream Burst: 12
Privacy Enable: TRUE
Ranging Backoff Start: 0 (at initial ranging)
Ranging Backoff End: 4 (at initial ranging)
Data Backoff Start: 0 (at initial ranging)
Data Backoff End: 4 (at initial ranging)
IP Address: 0.0.0.0
Net Mask: 0.0.0.0
TFTP Server IP Address: 223.255.254.254
Time Server IP Address: 188.188.1.5
Config File Name: muck/ebuell/tftp/cm_conf
Time Zone Offset: -28800
Table 8 describes the fields shown in the display.
| Field | Description |
|---|---|
MAC State | Current operational state of the MAC layer of the cable modem. |
Ranging SID | Service ID used for ranging requests. |
Registered | Indicates whether or not the cable modem is currently registered with the CMTS. |
Privacy Established | Indicates whether or not keys for baseline privacy have been exchanged between the cable modem and the CMTS, establishing privacy. |
Mac Resets | Number of times the uBR904 reset or initialized this interface. |
Sync lost | Number of times the uBR904 lost synchronization with the downstream channel. |
Invalid Maps | Number of times the uBR904 received invalid MAP messages. |
Invalid UCDs | Number of times the uBR904 received invalid UCD messages. |
Invalid Rng Rsp | Number of times the uBR904 received invalid ranging response messages. |
Invalid Reg Rsp | Number of times the uBR904 received invalid registration response messages. |
T1 Timeouts | Number of timeouts caused by the uBR904 not receiving a valid upstream channel descriptor (UCD) from the CMTS within the specified time. |
T2 Timeouts | Number of timeouts caused by the uBR904 not receiving a maintenance broadcast for ranging opportunities from the CMTS within a specified time. |
T3 Timeouts | Number of timeouts caused by the uBR904 not receiving a response within a specified time from the CMTS to a RNG-REQ message during initial maintenance. |
T4 Timeouts | Number of timeouts caused by the uBR904 not receiving a response within a specified time from the CMTS to a periodic maintenance request. |
Range Aborts | Number of times the ranging process was aborted by the CMTS. |
DS ID | The identifier of the downstream channel on which this MAC management message has been transmitted. This identifier is arbitrarily chosen by the CMTS and is only unique within the MAC-sublayer domain. |
DS Frequency | Downstream frequency acquired by the cable modem during its last initialization sequence. |
DS Symbol Rate | Downstream frequency in symbols per second. |
DS QAM Mode | Downstream modulation scheme being used by the cable modem. |
DS Search | Frequency bands scanned by the cable modem when searching for a downstream channel. The uBR904's default frequency bands correspond to the North American EIA CATV channel plan for 6 MHz channel slots between 90 MHz and 858 MHz. |
US ID | The identifier of the upstream channel to which this MAC management message refers. This identifier is arbitrarily chosen by the CMTS and is only unique within the MAC-sublayer domain. |
US Frequency | Transmission frequency used by the cable modem in the upstream direction. |
US Power Level | Transmit power level of the cable modem in the upstream direction. |
US Symbol Rate | Upstream frequency in symbols per second. |
Ranging Offset | Delay correction (in increments of 6.25 us/64) applied by the cable modem to the CMTS upstream frame time derived at the cable modem. Used to synchronize the upstream transmissions in the time division multiple access (TDMA) scheme, this value is roughly equal to the round-trip delay of the cable modem from the CMTS. |
Mini-Slot Size | Size T of the mini-slot for this upstream channel in units of the timebase tick of 6.25 us. Allowable values are 2, 4, 8, 16, 32, 64, or 128. |
Change Count | Incremented by 1 by the CMTS whenever any of the values of this channel descriptor change. If the value of this count in a sebsequent upstream channel descriptor (UCD) remains the same, the cable modem can quickly decide that the remaining fields have not changed, and may be able to disregard the remainder of the message. |
Preamble Pattern | Byte pattern used for the preamble. |
Burst Descriptor: Interval Usage Code | A compound type/length/value (TLV) encoding that defines, for each type of upstream usage interval, the physical-layer characteristics that are to be used during that interval. Each burst descriptor is given an identifying number. Each upstream transmit burst belongs to a class which is given a number called the IUC (interval usage code). Bandwidth maps messages (MAP) are used by IUC codes to allocate upstream time slots. The following types are currently defined: 1. Request: bandwidth request slot 2. Request/Data: bandwidth request or data slot 3. Initial Maintenance: initial link registration contention slot 4. Station Maintenance: link keep-alive slot 5. Short Data Grant: short data burst slot 6. Long Data Grant: long data burst slot |
Modulation Type | Upstream modulation format. (1 = QPSK; 2 = 16QAM) |
Differential Encoding | Indicates whether or not differential encoding is used. (1 = yes; 2 = no) |
Preamble Length | Length of the preamble in bits. The value must be an integral number of symbols---a multiple of 2 for QPSK; a multiple of 4 for 16QAM. |
FEC Error Correction | Length of the forward error correction in bytes. The range is 0-10 bytes; a value of 0 implies no forward error correction. |
FEC Codeword Info Bytes | Number of information bytes in the FEC codeword. |
Scrambler Seed | 15-bit seed value loaded at the beginning of each burst after the register has been cleared. Not used if scrambler is off. |
Maximum Burst Size | Maximum number of mini-slots that can be transmitted during this burst type. When the interval type is Short Data Grant, this value must be greater than 0. If this value is 0, the burst size is limited elsewhere. |
Guard Time Size | Amount of time in symbols between the center of the last symbol of one burst and the center of the first symbol of the preamble of an immediately following burst in an upstream transmission from the cable modem to the CMTS. |
Last Codeword Length | Indicates whether or not the length of the last codeword is fixed or shortened. |
Scrambler on/off | Indicates whether or not a scrambler is enabled in the upstream modulator. |
Network Access | Indicates whether or not the cable modem has access to the HFC network. |
Vendor ID | Unique identifier specifying the cable modem manufacturer. |
Auth. Wait Timeout | The number of seconds the cable modem waits for a reply after sending the Authorization Request message to the CMTS. |
Reauth. Wait Timeout | The number of seconds the cable modem waits for a reply after it has sent an Authorization Request message to the CMTS in response to a reauthorization request or an Authorization Invalid message from the CMTS. |
Auth. Grace Time | The number of seconds before the current authorization is set to expire that the grace timer begins, signaling the cable modem to begin the reauthorization process. |
Op. Wait Timeout | The number of seconds the TEK state machine waits for a reply from the CMTS after sending its initial Key Request for its SID's keying material. |
Retry Wait Timeout | The number of seconds the TEK state machine waits for a replacement key for this SID after the TEK grace timer has expired and the request for a replacement key has been made. |
TEK Grace Time | The number of seconds before the current TEK is set to expire that the TEK grace timer begins, signaling the TEK state machine to request a replacement key. |
Auth. Reject Wait Time | Number of seconds the cable modem waits before sending another Authorization Request message to the CMTS after it has received an Authorization Reject message. |
Assigned SID | Service ID assigned by the CMTS for the corresponding service class. |
Max Downstream Rate | Maximum downstream rate in bits per second that the CMTS is permitted to forward to CPE unicast MAC addresses learned or configured as mapping to this uBR904. (This does not include MAC packets addressed to broadcast or multicast MAC addresses.) |
Max Upstream Rate | Maximum upstream rate in bits per second that the uBR904 is permitted to forward to the RF network. This includes packet PDU data packets addressed to broadcast or multicast addresses. |
Upstream Priority | Relative priority assigned to this service class for data transmission in the upstream channel. Higher numbers indicate higher priority. |
Min Upstream Rate | Date rate in bits per second that will be guaranteed to this service class on the upstream channel. |
Max Upstream Burst | Maximum transmit burst in bytes allowed for this service class on the upstream channel. |
Privacy Enable | Indicates whether or not Baseline Privacy is enabled for this service class. |
Ranging Backoff Start | Initial back-off window for initial ranging contention, expressed as a power of 2. Valid values are from 0 to 15. |
Ranging Backoff End | Final back-off window for initial ranging contention, expressed as a power of 2. Valid values are from 0 to 15. |
Data Backoff Start | Initial back-off window for contention data and requests, expressed as a power of 2. Valid values are from 0 to 15. |
Data Backoff End | Final back-off window for contention data and requests, expressed as a power of 2. Valid values are from 0 to 15. |
IP Address | IP address of the cable interface. |
Net Mask | Subnet mask of the cable interface. |
TFTP Server IP Address | IP address of the CMTS TFTP server. |
Time Server IP Address | IP address of the CMTS Time of Day (TOD) server. |
Config File Name | Name of the configuration file that is downloaded from the TFTP server to provide the cable modem with operational parameters. |
Time Zone Offset | Correction received from the DHCP server to synchronize the cable modem time clock with the CMTS. |
show controllers cable-modem
show controllers cable-modem bpkm
show controllers cable-modem des
show controllers cable-modem filters
show controllers cable-modem lookup-table
show controllers cable-modem phy
show controllers cable-modem tuner
To display the contents of the registers used in the downstream physical hardware of the Cisco uBR904 cable modem, use the show controllers cable-modem phy command in privileged EXEC mode.
show controllers cable-modem phy {receive | transmit}
receive | Displays all receiver registers in the downstream physical hardware. |
transmit | Displays all transmitter registers in the upstream physical hardware. |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
To understand the output from this command, consult the Broadcom specifications for the BCM3116 and BCM3037 chips.
Physical receive registers are displayed in the following example:
uBR904#show controllers cable-modem 0 phy receiveBCM3116 Receiver Registers: Chip ID = C2C1rstctl= frzctl=20 qamctl=1B lmsctl=0B tpctl=00 fmtctl=24ffectl=3F irqsts=09 irqmask=00 stoscm=9E rstctr=00 frzctl2=46dvctl=30 idepth=55 eqlctl=00 tstctl=02 berctl=00 clkset=00tunset=00 tunctl=03FFC coefficient registers:F0=0067FFBC F1=FF880080 F2=00C1FEFB F3=FF75019DF4=00C5FD89 F5=FF6D0485 F6=FC95F690 F7=2D280000DFE coefficient registers:D00=0636031E D01=FBDD0314 D02=0077FD39 D03=001B00C6D04=0024FF74 D05=0015007E D06=000CFFC4 D07=FFC0004BD08=0044FFF6 D09=FFE00019 D10=00190005 D11=FFD3FFADD12=FFD3FFE0 D13=001A000A D14=FFF3FFED D15=0008FFFDD16=FFFC0024 D17=0023FFDF D18=0029FFFF D19=000D001ED20=00020017 D21=00250001 D22=0007FFF4 D23=FFF60014ldsft=B0EE ldsnre=0098AF ldif=0D004E ldbbi=00000000ldbbq=00000000 ldali=032E00 ldaii=E62AF2 ldbrfo=705A05ldbri=F9CDC200 lddrfo=007E7D lddri=007EF0FEC correctable error count: 0FEC uncorrectable error count: 0Bit Error Rate Count: 0
Physical transmit registers are displayed in the following example:
uBR904#show controllers cable-modem 0 phy transmitBCM3037 Transmitter Registers:part_id = 3037 rev_id = 01test_mode = 00 test_input = 00test_misc = 2009 rst = 00power = 0000 power_2 = 00port = 6F pll = F7map = 66 mod = 28tx_oen_bdly = 14 tx_oen_edly = C8prbs_cfg = 00C000 baud = 1A36E3burst = 0000 if_freq = 200000dac = 37 tx_config = 00burst config 0 : prbs_init = FFFFFF rs = 343Efec = 00 qam = 01pream_len = 0018 offset = 0000burst config 1 : prbs_init = FFFFFE rs = 033Bfec = 1C qam = 65pream_len = 0000 offset = 0000burst config 2 : prbs_init = FFFFFE rs = 033Bfec = 1D qam = 65pream_len = 0000 offset = 0000burst config 3 : prbs_init = FFFFFE rs = 033Bfec = 1E qam = 65burst config 4 : prbs_init = FFFFFE rs = 033Bfec = 1F qam = 65pream_len = 0000 offset = 0000burst config 5 : prbs_init = FFFFFE rs = 033Bfec = 0F qam = 66pream_len = 0000 offset = 0000Eq Coeff:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00Preamble values:CC CC CC CC CC 0D 0D CC CC CC CC CC CC CC CC 0D04 25 01 01 01 01 02 01 02 03 02 00 40 04 02 0040 05 01 00 06 01 10 07 02 01 52 08 01 01 09 0108 0A 01 01 0B 01 02 04 25 03 01 01 01 02 01 0203 02 00 50 04 02 00 30 05 01 00 06 01 22 07 0201 52 08 01 00 09 01 30 0A 01 01 0B 01 02 04 2504 01 01 01 02 01 02 03 02 00 40 04 02 00 40 0501 00 06 01 22 07 02 01 52 08 01 00 09 01 30 0A
show controllers cable-modem
show controllers cable-modem bpkm
show controllers cable-modem des
show controllers cable-modem filters
show controllers cable-modem lookup-table
show controllers cable-modem mac
show controllers cable-modem tuner
To display the settings for the upstream and downstream tuners used by a Cisco uBR904 cable modem, use the show controllers cable-modem tuner command in privileged EXEC mode.
show controllers cable-modem tunerThere are no key words or arguments for this command.
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
The cable modem's tuner settings are displayed in the following example. See Table 9 for output field possibilities and descriptions.
uBR904#show controllers cable-modem 0 tunerTuner: status=0x00Rx: tuner_freq 507000000, symbol_rate 5360736, local_freq 11520000snr_estimate 17488, ber_estimate 0, lock_threshold 26000QAM not in lock, FEC not in lock, qam_mode QAM_64Tx: tx_freq 20000000, power_level 0x3E, symbol_rate 1280000
Table 9 describes the fields shown in the display
| Field | Description |
|---|---|
| Indicates the current downstream frequency. |
| Indicates the downstream or upstream symbol rate in use. |
local_freq | Frequency on which the transmitter and tuner communicate. |
| Signal to noise estimate in dB X 1000. |
| Bit error rate estimate (always 0). |
lock_threshold | Minimum signal-to-noise ratio (SNR) that the uBR904 will accept as a valid lock. |
| Indicates if QAM/FEC lock has been acquired and the modulation mode in use. |
tx_freq | Upstream frequency sent to the uBR904 by the CMTS in the UCD message. |
power_level | Transmit power level as set in the hardware, given as a hexadecimal value. The units are unique to the hardware used. Use the show controllers cable-modem 0 mac state command to see the power level in dBmV. |
show controllers cable-modem
show controllers cable-modem bpkm
show controllers cable-modem des
show controllers cable-modem filters
show controllers cable-modem lookup-table
show controllers cable-modem mac
show controllers cable-modem phy
The following new debug commands are available to troubleshoot a cable modem:
To debug baseline privacy information on a cable modem, use the debug cable-modem mac command in privileged EXEC mode. The no form of this command turns debugging messages off.
[no] debug cable-modem bpkm {errors | events | packets}
errors | Debugs cable modem privacy errors. |
events | Debugs events related to cable baseline privacy. |
packets | Debugs baseline privacy packets. |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
Figure 3 shows the required keywords within the debug cable-modem bpkm command. You must choose one.
uBR904# debug cable-modem bpkm ? errors Cable Modem privacy errors events events related to cable baseline privacy packets baseline privacy packets
Figure 4 shows output when the headend does not have privacy enabled.
uBR904# debug cable bpkm cm_bpkm_fsm(): machine: KEK, event/state: EVENT_4_TIMEOUT/STATE_B_AUTH_WAIT, new state: STATE_B_AUTH_WAIT cm_bpkm_fsm(): machine: KEK, event/state: EVENT_4_TIMEOUT/STATE_B_AUTH_WAIT, new state: STATE_B_AUTH_WAIT %LINEPROTO-5-UPDOWN: Line protocol on Interface cable-modem0, changed state to down cm_bpkm_fsm(): machine: KEK, event/state: EVENT_1_PROVISIONED/STATE_A_START, new state: STATE_B_AUTH_WAIT %LINEPROTO-5-UPDOWN: Line protocol on Interface cable-modem0, changed state to up
debug cable-modem bridge
debug cable-modem error
debug cable-modem interrupts
debug cable-modem mac
debug cable-modem map
Use the debug cable-modem bridge command in privileged EXEC mode to debug bridge filter processing information on a cable modem. The no form of this command turns debugging messages off.
[no] debug cable-modem bridgeThis command has no keywords or arguments.
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
When the interface is down, all bridge table entries learned on the Ethernet interface are set to discard because traffic is not bridged until the cable interface has completed initialization. After the interface (the line protocol) is completely up, bridge table entries learned on the Ethernet interface program the cable's MAC data filters. The cable MAC hardware filters out any received packets whose addresses are not in the filters. In this way, the cable interface only receives packets addressed to its own MAC address or an address it has learned on the Ethernet interface.
Figure 5 shows sample display output for the debug cable-modem bridge Privileged EXEC command.
uBR904# debug cable-modem bridge %LINEPROTO-5-UPDOWN: Line protocol on Interface cable-modem0, changed state to downshut cm_tbridge_add_entry(): MAC not initialized, discarding entry: 00e0.fe7a.186fno shut cm_tbridge_add_entry(): MAC not initialized, discarding entry: 00e0.fe7a.186f %LINEPROTO-5-UPDOWN: Line protocol on Interface cable-modem0, changed state to up cm_tbridge_add_entry(): Adding entry 00e0.fe7a.186f to filter 2
debug cable-modem bpkm
debug cable-modem error
debug cable-modem interrupts
debug cable-modem mac
debug cable-modem map
Use the the debug cable-modem error command in privileged EXEC mode to enable debugging messages for the cable interface driver. The no form of this command turns debugging messages off.
[no] debug cable-modem errorThis command has no keywords or arguments.
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
This command displays detailed output about the sanity checking of received frame formats, the acquisition of downstream QAM/FEC lock, the receipt or non-receipt of SYNC messages from the CMTS, reception errors, and bandwidth request failures.
Figure 6 shows sample display output for the debug cable-modem error command.
uBR904# debug cable-modem error *Mar 7 20:16:29: AcquireSync(): Update rate is 100 Hz *Mar 7 20:16:30: 1st Sync acquired after 1100 ms. *Mar 7 20:16:30: Recovery loop is locked (7/9) *Mar 7 20:16:30: 2nd Sync acquired after 100 ms. *Mar 7 20:16:30: Recovery loop is locked (10/15)
debug cable-modem bpkm
debug cable-modem bridge
debug cable-modem interrupts
debug cable-modem mac
debug cable-modem map
Use the debug cable-modem interrupts command in privileged EXEC mode to debug cable modem interrupts. The no form of this command turns debugging messages off.
[no] debug cable-modem interruptsThis command has no keywords or arguments.
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
Figure 7 shows sample debug output for cable modem interrupts.
uBR904# debug cable-modem interrupts *** bcm3220_rx_mac_msg_interrupt *** *** bcm3220_rx_mac_msg_interrupt *** ### bcm3220_tx_interrupt ### *** bcm3220_rx_mac_msg_interrupt *** ### bcm3220_tx_interrupt ### *** bcm3220_rx_mac_msg_interrupt *** ### bcm3220_tx_interrupt ### ### bcm3220_tx_interrupt ### ### bcm3220_tx_interrupt ### ### bcm3220_tx_interrupt ###
debug cable-modem bpkm
debug cable-modem bridge
debug cable-modem error
debug cable-modem mac
debug cable-modem map
Use the debug cable-modem mac command in privileged EXEC mode to troubleshoot the cable modem MAC layer. The no form of this command turns debugging messages off.
[no] debug cable-modem mac {log [verbose] | messages}
log | Realtime MAC log display. |
verbose | (Optional) Displays periodic MAC layer events, such as ranging. |
messages | MAC layer management messages. |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
Of all the available debug cable modem commands, the most useful is debug cable-modem mac log.
Mac log messages are written to a circular log file even when debugging is not turned on. These messages include timestamps, events, and information pertinent to these events. Enter the debug cable-modem mac log command to view Mac log messages. If you want to view this information without entering debug mode, enter the show controllers cable-modem number mac log command. The same information is displayed by both commands.
If the cable modem interface fails to come up or resets periodically, the Mac log will show what happened. For example, if an address is not obtained from the DHCP server, an error is logged, initialization starts over, and the cable modem scans for a downstream frequency. The debug cable-modem mac log command displays the log from oldest entry to newest entry.
After initial ranging is successful (dhcp_state has been reached), further RNG-REQ/RNG-RSP messages and watchdog timer entries are suppressed from output unless the verbose keyword is used. Note that CMAC_LOG_WATCHDOG_TIMER entries while in the maintenance_state are normal when using the verbose keyword.
Figure 8 shows sample display output from the debug cable-modem mac log command. The fields of the output are the date, local time, seconds since bootup, the log message, and in some cases a parameter that gives more detail about the log entry.
The line "0 events dropped due to lack of a chunk" at the end of a display indicates that no log entries were discarded due to a temporary lack of memory. This means the log is accurate and reliable.
uBR904# debug cable-modem mac log *Mar 7 01:42:59: 528302.040 CMAC_LOG_LINK_DOWN *Mar 7 01:42:59: 528302.042 CMAC_LOG_RESET_FROM_DRIVER *Mar 7 01:42:59: 528302.044 CMAC_LOG_STATE_CHANGE wait_for_link_up_state *Mar 7 01:42:59: 528302.046 CMAC_LOG_DRIVER_INIT_IDB_SHUTDOWN 0x08098D02 *Mar 7 01:42:59: 528302.048 CMAC_LOG_LINK_DOWN *Mar 7 01:43:05: 528308.428 CMAC_LOG_DRIVER_INIT_IDB_RESET 0x08098E5E *Mar 7 01:43:05: 528308.432 CMAC_LOG_LINK_DOWN *Mar 7 01:43:05: 528308.434 CMAC_LOG_LINK_UP *Mar 7 01:43:05: 528308.436 CMAC_LOG_STATE_CHANGE ds_channel_scanning_state *Mar 7 01:43:05: 528308.440 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 88/453000000/855000000/6000000 *Mar 7 01:43:05: 528308.444 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 89/93000000/105000000/6000000 *Mar 7 01:43:05: 528308.448 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 90/111250000/117250000/6000000 *Mar 7 01:43:05: 528308.452 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 91/231012500/327012500/6000000 *Mar 7 01:43:05: 528308.456 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 92/333015000/333015000/6000000 *Mar 7 01:43:05: 528308.460 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 93/339012500/399012500/6000000 *Mar 7 01:43:05: 528308.462 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 94/405000000/447000000/6000000 *Mar 7 01:43:05: 528308.466 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 95/123015000/129015000/6000000 *Mar 7 01:43:05: 528308.470 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 96/135012500/135012500/6000000 *Mar 7 01:43:05: 528308.474 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 97/141000000/171000000/6000000 *Mar 7 01:43:05: 528308.478 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 98/219000000/225000000/6000000 *Mar 7 01:43:05: 528308.482 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 99/177000000/213000000/6000000 *Mar 7 01:43:05: 528308.486 CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY 663000000 *Mar 7 01:43:05: 528308.488 CMAC_LOG_WILL_SEARCH_USER_DS_FREQUENCY 663000000 *Mar 7 01:43:07: 528310.292 CMAC_LOG_DS_64QAM_LOCK_ACQUIRED 663000000 . . . 528383.992 CMAC_LOG_STATE_CHANGE registration_state 528384.044 CMAC_LOG_REG_REQ_MSG_QUEUED 528384.050 CMAC_LOG_REG_REQ_TRANSMITTED 528384.052 CMAC_LOG_REG_RSP_MSG_RCVD 528384.078 CMAC_LOG_COS_ASSIGNED_SID 1/4 528384.102 CMAC_LOG_RNG_REQ_QUEUED 4 528384.102 CMAC_LOG_REGISTRATION_OK 528384.102 CMAC_LOG_STATE_CHANGE establish_privacy_state 528384.102 CMAC_LOG_STATE_CHANGE maintenance_state 528388.444 CMAC_LOG_RNG_REQ_TRANSMITTED 528388.444 CMAC_LOG_RNG_RSP_MSG_RCVD 528398.514 CMAC_LOG_RNG_REQ_TRANSMITTED 528398.516 CMAC_LOG_RNG_RSP_MSG_RCVD 528408.584 CMAC_LOG_RNG_REQ_TRANSMITTED 528408.586 CMAC_LOG_RNG_RSP_MSG_RCVD 528414.102 CMAC_LOG_WATCHDOG_TIMER 528418.654 CMAC_LOG_RNG_REQ_TRANSMITTED 528418.656 CMAC_LOG_RNG_RSP_MSG_RCVD 528428.726 CMAC_LOG_RNG_REQ_TRANSMITTED 528428.728 CMAC_LOG_RNG_RSP_MSG_RCVD 528438.796 CMAC_LOG_RNG_REQ_TRANSMITTED 528438.798 CMAC_LOG_RNG_RSP_MSG_RCVD 528444.102 CMAC_LOG_WATCHDOG_TIMER 528444.492 CMAC_LOG_LINK_DOWN 528444.494 CMAC_LOG_RESET_FROM_DRIVER 528444.494 CMAC_LOG_STATE_CHANGE wait_for_link_up_state 528444.494 CMAC_LOG_DRIVER_INIT_IDB_SHUTDOWN 0x08098D02 528444.494 CMAC_LOG_LINK_DOWN 528474.494 CMAC_LOG_WATCHDOG_TIMER 528504.494 CMAC_LOG_WATCHDOG_TIMER 528534.494 CMAC_LOG_WATCHDOG_TIMER 0 events dropped due to lack of a chunk
Figure 9 compares the output of the debug cable-modem mac log command with the debug cable-modem mac log verbose command. The verbose keyword displays periodic events such as ranging.
uBR904# debug cable mac log Cable Modem mac log debugging is on uBR904# uBR904# uBR904# debug cable mac log verbose Cable Modem mac log debugging is on (verbose) uBR904# 574623.810 CMAC_LOG_RNG_REQ_TRANSMITTED 574623.812 CMAC_LOG_RNG_RSP_MSG_RCVD 574627.942 CMAC_LOG_WATCHDOG_TIMER 574633.880 CMAC_LOG_RNG_REQ_TRANSMITTED 574633.884 CMAC_LOG_RNG_RSP_MSG_RCVD 574643.950 CMAC_LOG_RNG_REQ_TRANSMITTED 574643.954 CMAC_LOG_RNG_RSP_MSG_RCVD 574654.022 CMAC_LOG_RNG_REQ_TRANSMITTED 574654.024 CMAC_LOG_RNG_RSP_MSG_RCVD 574657.978 CMAC_LOG_WATCHDOG_TIMER 574664.094 CMAC_LOG_RNG_REQ_TRANSMITTED 574664.096 CMAC_LOG_RNG_RSP_MSG_RCVD 574674.164 CMAC_LOG_RNG_REQ_TRANSMITTED 574674.166 CMAC_LOG_RNG_RSP_MSG_RCVD uBR904# no debug cable mac log verbose Cable Modem mac log debugging is off uBR904# 574684.234 CMAC_LOG_RNG_REQ_TRANSMITTED 574684.238 CMAC_LOG_RNG_RSP_MSG_RCVD
Figure 10 shows display output for the debug cable mac messages command. This command causes received cable MAC management messages to be displayed in a verbose format. The messages that are displayed are UCD, MAP, RNG-RSP, REG-RSP and UCC. In addition, transmitted REG-REQs are displayed in hex dump format. The output from this command is very verbose and is usually not needed for normal interface debugging. The command is most useful when attempting to attach a cable modem to an uncertified CMTS. For a description of the displayed fields of each message, refer to the MCNS DOCSIS RFI spec, v1.0.
uBR904# debug cable mac messages *Mar 7 01:44:06: *Mar 7 01:44:06: UCD MESSAGE *Mar 7 01:44:06: ----------- *Mar 7 01:44:06: FRAME HEADER *Mar 7 01:44:06: FC - 0xC2 == MAC Management *Mar 7 01:44:06: MAC_PARM - 0x00 *Mar 7 01:44:06: LEN - 0xD3 *Mar 7 01:44:06: MAC MANAGEMENT MESSAGE HEADER *Mar 7 01:44:06: DA - 01E0.2F00.0001 *Mar 7 01:44:06: SA - 00E0.1EA5.BB60 *Mar 7 01:44:06: msg LEN - C1 *Mar 7 01:44:06: DSAP - 0 *Mar 7 01:44:06: SSAP - 0 *Mar 7 01:44:06: control - 03 *Mar 7 01:44:06: version - 01 *Mar 7 01:44:06: type - 02 == UCD *Mar 7 01:44:06: RSVD - 0 *Mar 7 01:44:06: US Channel ID - 1 *Mar 7 01:44:06: Configuration Change Count - 4 *Mar 7 01:44:06: Mini-Slot Size - 8 *Mar 7 01:44:06: DS Channel ID - 1 *Mar 7 01:44:06: Symbol Rate - 8 *Mar 7 01:44:06: Frequency - 20000000 *Mar 7 01:44:06: Preamble Pattern - CC CC CC CC CC CC CC CC CC CC CC CC CC CC 0D 0D *Mar 7 01:44:06: Burst Descriptor 0 *Mar 7 01:44:06: Interval Usage Code - 1 *Mar 7 01:44:06: Modulation Type - 1 == QPSK *Mar 7 01:44:06: Differential Encoding - 2 == OFF *Mar 7 01:44:06: Preamble Length - 64 *Mar 7 01:44:06: Preamble Value Offset - 56 *Mar 7 01:44:06: FEC Error Correction - 0 *Mar 7 01:44:06: FEC Codeword Info Bytes - 16 *Mar 7 01:44:06: Scrambler Seed - 0x0152 *Mar 7 01:44:06: Maximum Burst Size - 1 *Mar 7 01:44:06: Guard Time Size - 8 *Mar 7 01:44:06: Last Codeword Length - 1 == FIXED *Mar 7 01:44:06: Scrambler on/off - 1 == ON *Mar 7 01:44:06: Burst Descriptor 1 *Mar 7 01:44:06: Interval Usage Code - 3 *Mar 7 01:44:06: Modulation Type - 1 == QPSK *Mar 7 01:44:06: Differential Encoding - 2 == OFF *Mar 7 01:44:06: Preamble Length - 128 *Mar 7 01:44:06: Preamble Value Offset - 0 *Mar 7 01:44:06: FEC Error Correction - 5 *Mar 7 01:44:06: FEC Codeword Info Bytes - 34 *Mar 7 01:44:06: Scrambler Seed - 0x0152 *Mar 7 01:44:06: Maximum Burst Size - 0 *Mar 7 01:44:06: Guard Time Size - 48 *Mar 7 01:44:06: Last Codeword Length - 1 == FIXED *Mar 7 01:44:06: Scrambler on/off - 1 == ON *Mar 7 01:44:06: Burst Descriptor 2 *Mar 7 01:44:06: Interval Usage Code - 4 *Mar 7 01:44:06: Modulation Type - 1 == QPSK *Mar 7 01:44:06: Differential Encoding - 2 == OFF *Mar 7 01:44:06: Preamble Length - 128 *Mar 7 01:44:06: Preamble Value Offset - 0 *Mar 7 01:44:06: FEC Error Correction - 5 *Mar 7 01:44:06: FEC Codeword Info Bytes - 34 *Mar 7 01:44:06: Scrambler Seed - 0x0152 *Mar 7 01:44:06: Maximum Burst Size - 0 *Mar 7 01:44:06: Guard Time Size - 48 *Mar 7 01:44:06: Last Codeword Length - 1 == FIXED *Mar 7 01:44:06: Scrambler on/off - 1 == ON *Mar 7 01:44:06: Burst Descriptor 3 *Mar 7 01:44:06: Interval Usage Code - 5 *Mar 7 01:44:06: Modulation Type - 1 == QPSK *Mar 7 01:44:06: Differential Encoding - 2 == OFF *Mar 7 01:44:06: Preamble Length - 72 *Mar 7 01:44:06: Preamble Value Offset - 48 *Mar 7 01:44:06: FEC Error Correction - 5 *Mar 7 01:44:06: FEC Codeword Info Bytes - 75 *Mar 7 01:44:06: Scrambler Seed - 0x0152 *Mar 7 01:44:06: Maximum Burst Size - 0 *Mar 7 01:44:06: Guard Time Size - 8 *Mar 7 01:44:06: Last Codeword Length - 1 == FIXED *Mar 7 01:44:06: Scrambler on/off - 1 == ON *Mar 7 01:44:06: *Mar 7 01:44:06: *Mar 7 01:44:06: MAP MESSAGE *Mar 7 01:44:06: ----------- *Mar 7 01:44:06: FRAME HEADER *Mar 7 01:44:06: FC - 0xC3 == MAC Management with Extended Header *Mar 7 01:44:06: MAC_PARM - 0x02 *Mar 7 01:44:06: LEN - 0x42 *Mar 7 01:44:06: EHDR - 0x00 0x00 *Mar 7 01:44:06: MAC MANAGEMENT MESSAGE HEADER *Mar 7 01:44:06: DA - 01E0.2F00.0001 . . . *Mar 7 01:44:17: RNG-RSP MESSAGE *Mar 7 01:44:17: --------------- *Mar 7 01:44:17: FRAME HEADER *Mar 7 01:44:17: FC - 0xC2 == MAC Management *Mar 7 01:44:17: MAC_PARM - 0x00 *Mar 7 01:44:17: LEN - 0x2B *Mar 7 01:44:17: MAC MANAGEMENT MESSAGE HEADER *Mar 7 01:44:17: DA - 00F0.1EB2.BB61 . . . *Mar 7 01:44:20: REG-REQ MESSAGE *Mar 7 01:44:20: --------------- *Mar 7 01:44:20: C20000A5 000000E0 1EA5BB60 00F01EB2 *Mar 7 01:44:20: BB610093 00000301 06000004 03010104 *Mar 7 01:44:20: 1F010101 0204003D 09000304 001E8480 *Mar 7 01:44:20: 04010705 04000186 A0060200 0C070101 *Mar 7 01:44:20: 080300F0 1E112A01 04000000 0A020400 *Mar 7 01:44:20: 00000A03 04000002 58040400 00000105 *Mar 7 01:44:20: 04000000 01060400 00025807 04000000 *Mar 7 01:44:20: 3C2B0563 6973636F 06105E4F C908C655 *Mar 7 01:44:20: 61086FD5 5C9D756F 7B730710 434D5453 *Mar 7 01:44:20: 204D4943 202D2D2D 2D2D2D2D 0C040000 *Mar 7 01:44:20: 00000503 010100 *Mar 7 01:44:20: *Mar 7 01:44:20: *Mar 7 01:44:20: REG-RSP MESSAGE *Mar 7 01:44:20: --------------- *Mar 7 01:44:20: FRAME HEADER *Mar 7 01:44:20: FC - 0xC2 == MAC Management *Mar 7 01:44:20: MAC_PARM - 0x00 *Mar 7 01:44:20: LEN - 0x29 *Mar 7 01:44:20: MAC MANAGEMENT MESSAGE HEADER *Mar 7 01:44:20: DA - 00F0.1EB2.BB61 .
debug cable-modem bpkm
debug cable-modem bridge
debug cable-modem error
debug cable-modem interrupts
debug cable-modem map
Use the debug cable-modem map command in privileged EXEC mode to display the timing from MAP messages to sync messages and the timing between MAP messages. The no form of this command disables debugging output.
[no] debug cable-modem mapThis command has no keywords or arguments.
Privileged EXEC
This command first appeared in Cisco IOS Release 11.3 NA.
Figure 11 shows display output for the debug cable map Privileged EXEC command.
uBR904# debug cable-modem map Cable Modem MAP debugging is on uBR904# *Mar 7 20:12:08: 595322.942: Min MAP to sync=72 *Mar 7 20:12:08: 595322.944: Max map to map time is 40 *Mar 7 20:12:08: 595322.982: Min MAP to sync=63 *Mar 7 20:12:08: 595323.110: Max map to map time is 41 *Mar 7 20:12:08: 595323.262: Min MAP to sync=59 *Mar 7 20:12:08: 595323.440: Max map to map time is 46 *Mar 7 20:12:09: 595323.872: Min MAP to sync=58
debug cable-modem bpkm
debug cable-modem bridge
debug cable-modem error
debug cable-modem interrupts
debug cable-modem mac
For more troubleshooting tips, see the chapter "Troubleshooting the Installation" in the Cisco Cable Modem Installation and Configuration Guide.
Posted: Tue Feb 1 17:46:25 PST 2000
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