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The enhancements to the Cisco uBR7246 cable router extend and improve the command line interface (CLI). They support burst profile, quality of service (QoS), improved parameter configuration, the MC11 modem card, and the MC16 modem card.
Downstream QoS handling is compliant with Multimedia Cable Network System (MCNS) requirements, and upstream QoS handling and Spectrum Management have been improved.
The Cisco uBR7246 now supports multicast authentication via RADIUS, and security has been enhanced for baseline privacy, including MCNS Data Over Cable System Interface Specification (DOCSIS) compliance. Also, this cable router now supports Dynamic Host Configuration Protocol (DHCP) Relay Subscriber ID Insertion.
These enhancements to the Cisco uBR7246 cable router bring value to the digital broadband network by:
This feature is supported on the Cisco uBR7246 router only.
Before configuring the feature enhancements, complete the basic configuration of the Cisco uBR7246 as described in the Cisco uBR7246 Universal Broadband Router Installation and Configuration Guide and the Voice, Video, and Home Applications Configuration Guide.
The Cisco uBR7246 feature enhancements support the Radio Frequency (RF) Interface Management Information Base (MIB). For descriptions of supported MIBs and how to use MIBs, see Cisco's MIB website on Cisco Connection Online (CCO) at the following URL: http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
No RFCs are supported by this feature.
Amplifier---Used on coaxial segments of a Community Antenna Television (CATV) plant to restore signal levels lost due to attenuation through distance. Unfortunately, amplifiers amplify noise as well as signal.
Branch Line---A coaxial cable that runs from a trunk line to a subscriber drop point. A branch line is also known as "Feeder Cable."
Cable Modem---Any device that modulates and demodulates digital data onto a CATV plant.
Cable Line Card---Modem front-end card of the cable router headend unit, plugged into the midplane. Each Cable Line Card provides a number of radio frequency (RF) channels as external interfaces.
Cable Router---A modular chassis-based router optimized for the data-over-CATV hybrid fiber-coaxial (HFC) application.
CATV---Originally Community Antenna Television. Now used to refer to any cable-based (coaxial/fiber) system provision of television services.
CDM---Cable Data Modem.
CDMTS, CMTS---Cable (Data) Modem Termination System.
Channel---A specific frequency allocation and bandwidth. Downstream channels used for television in the US are 6 MHz wide. In Europe, downstream channel width is 8 MHz.
CLI---Command line interface.
Combiner Group---The return paths of several fiber nodes can be combined at a single point to form one RF domain. This single point is called a combiner group. See also Spectrum Group.
CPE---Customer Premises Equipment. In the Cable Router application, this will usually be one or multiple PCs located at the customer side.
Distribution Hub---A smaller or remote headend distribution point for a CATV system. Video signals are received here from another site (headend), and redistributed. Sometimes a small number of locally originated signals are added. Such signals can be city information channels, HFC cable modem signals, and so forth.
Downstream---Set of frequencies used to send data from a headend to a subscriber.
Drop---A subscriber access point. The actual coaxial connection in the subscriber's home.
Fiber Node, Node---An optical node located in the outside plant distribution system which terminates the fiber-based downstream signal as an electrical signal onto a coaxial RF cable. Each fiber node is defined to support a certain serving area, either defined by number of homes passed or total amplifier cascade (number of active amplifiers in the longest line from the node to the end of the line).
Headend---Central distribution point for a CATV system. Video signals are received here from satellite (either co-located or remote), and the frequency is converted to the appropriate channels. Channels are then combined with locally originated signals, and rebroadcast onto the hybrid fiber-coaxial (HFC) plant. For a CATV data system, the headend is the typical place to link the HFC system and any external data networks.
HFC---Hybrid fiber-coaxial. 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.
Homes Passed---Number of homes or offices potentially serviceable by a cable system either on a per node or per system basis.
Midsplit---A frequency allocation plan where 5 to 108 MHz is used for upstream data and 178+ MHz is used for downstream data.
Optical Node---A device used to convert broadband RF (for example, television signals) to and from a fiber optic signal. An optical node is typically located in the outside field.
Predator---Code name for the Cisco 7200 class of modular routers that accept PCI bus-based port adapters.
QAM---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. Number of bits per symbol can be computed by 2(number of bits/symbol) = number of code points.
QPSK---Modulation scheme used in the upstream direction. Supports two data bits per symbol.
Spectrum Group---A combiner group can be associated with a frequency hop table. This frequency hop table associated with a combiner group is the spectrum group, as opposed to the RF topology point, which is the combiner group. See also Combiner Group.
Subsplit---A frequency allocation plan where 0 to 42 MHz is used for upstream data and 50+ MHz is used for downstream data.
Tap---A passive device that divides the signal between the trunk or feeder lines and splits the signal into ports for subscriber drop access.
Telephony Return---A variant of a cable data system where the return path from the subscriber cable modem is routed over a dialup (or ISDN) connection instead of over an upstream channel.
Trunk Line---A CATV backbone coaxial cable. This runs from an Optical Node and through a specific neighborhood or serving area.
Upstream---The set of frequencies used to send data from a subscriber to the headend.
The basic configuration tasks required by this version of the Cisco uBR7246 cable router are the same as those described in the Cisco uBR7246 Universal Broadband Router Installation and Configuration Guide and the Voice, Video, and Home Applications Configuration Guide.
Additional configuration tasks are:
You can configure upstream frequency hop tables using cable spectrum-group commands. Start by determining which upstream ports are assigned to a combiner group. Then apply the following steps to configure a spectrum group:
| Step | Command | Purpose |
|---|---|---|
| 1 | router(config)# cable spectrum-group n frequency y | Create the frequency hop table under Cisco IOS global configuration mode. |
| 2 | router(config-if)# cable n spectrum-group y | Assign the upstream port to the frequency hop table under Cisco IOS interface configuration mode. |
To configure frequency hopping, apply the following steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | router(config)# cable spectrum-group 1 frequency 20800000 router(config)# cable spectrum-group 1 frequency 22400000 router(config)# cable spectrum-group 1 frequency 24000000 | Configure spectrum groups.
|
| 2 | router(config)# interface c3/0 | Assign the upstream ports to the frequency hop tables for interface. |
| 3 | router(config-if)# cable spectrum-group 1 router(config-if)# no cable upstream 0 shutdown | Assign members to spectrum groups |
| 4 | router(config-if)# cable upstream 2 spectrum-group 1 router(config-if)# no cable upstream 2 shutdown | If you have an MC16 card, upstreams can be assigned individually. |
| 5 | router(config-if)# exit router# test cable hop c3/0 router# test cable hop c3/0 | Exit configuration mode and force the system to hop. |
After you have established basic operation, inject a tone to the upstream port. For example, if the upstream frequency is currently 22.4 MHz, inject a 22.4 MHz tone at approximately the same power level as the modem. (If the power level at the modem is 40 dBmV, set the tone power to 40 dBmV.) The interfering carrier should shut down the channel and cause the frequency to change to the next configured value. In this example, it would be 24.0 MHz.
If you do not have an RF tone generator, use another line card and modem that caries traffic. Connect the upstream to the same combiner group, and use the data carrier as an interfering signal by setting it to the same frequency. For example, to test frequency hopping on c3/0, install c4/0 and connect both upstreams together using a combiner. If the upstream frequency of c3/0 is currently 22.4 Mhz, set c4/0 to 22.4 Mhz while c4/0 is carrying traffic. This should force c3/0 to change the frequency to the next configured value.
The verification tasks required by this version of the Cisco uBR7246 cable router are the same as those described in the Cisco uBR7246 Universal Broadband Router Installation and Configuration Guide and the Voice, Video, and Home Applications Configuration Guide.
Note the following:
To illustrate configuring spectrum groups, assume that an MC16 card is in slot 3 and is named cable3/0. Its upstream ports are named U0 through U5. You want ports U0 through U3 to belong to one combiner group, and ports U4 and U5 to belong to a different combiner group because of higher subscriber penetration. In both combiner groups, the allocated spectrum should be three 3.2 MHz slots centered at 21.6, 24.8, and 28.0 MHz. The allocated spectrum is 20.0 to 29.6 MHz. From global configuration mode, enter the configure terminal command. Then enter:
router(config)# cable spectrum-group 1 frequency 21600000 router(config)# cable spectrum-group 1 frequency 24800000 router(config)# cable spectrum-group 1 frequency 28000000 router(config)# cable spectrum-group 2 shared router(config)# cable spectrum-group 2 frequency 21600000 router(config)# cable spectrum-group 2 frequency 24800000 router(config)# cable spectrum-group 2 frequency 28000000
Spectrum group 1 will be used for ports U0 through U3. Spectrum group 2 will be used for ports U4 and U5. Because ports U4 and U5 belong to the same combiner group, spectrum group 2 is configured as shared. The shared keyword prevents frequency collision.
To assign the upstream ports to the frequency hop tables for slot 3, enter:
router(config)# interface Cable3/0
Then enter:
router(config-if)# cable u0 spectrum-group 1 router(config-if)# cable u1 spectrum-group 1 router(config-if)# cable u2 spectrum-group 1 router(config-if)# cable u3 spectrum-group 1 router(config-if)# cable u4 spectrum-group 2 router(config-if)# cable u5 spectrum-group 2
The upstream ports are assigned frequencies from their respective spectrum groups. Ports U0 through U3 will be set to 21.6 MHz. Ports U4 and U5 will be set to 21.6 and 24.8 MHz, respectively.
For additional configuration examples, refer to the Cisco uBR7246 Universal Broadband Router Installation and Configuration Guide and the Voice, Video, and Home Applications Configuration Guide.
This section documents new or modified commands. All other commands used with this feature are documented in the Cisco IOS Release 11.3 command references.
64qam | Modulation is 6 bits per downstream symbol rate. |
256qam | Modulation is 8 bits per downstream symbol rate. |
64qam
Cable interface configuration
| Release | Modification |
|---|---|
11.3 XA | This command was first introduced. |
Downstream modulation defines the modulation type used for downstream traffic. Specifying the symbol rate indirectly influences the interface speed; at 64qam, the interface speed is 6xx bits/second. Specifying 256qam sets the interface speed to 8xx bits/second.
The following example sets the downstream modulation:
Router(config)# interface cable 6/0 Router(config-if)# cable downstream modulation 256qam
To enable Data Over Cable Services Interface Specification (DOCSIS) rate limiting on downstream traffic, use the cable downstream rate-limit interface configuration command. Use the no form of this command to disable DOCSIS rate-limiting on downstream traffic.
cable downstream rate-limit [token-bucket | weighted-discard] [exp-weight]
token-bucket | (Optional) Specifies the token bucket filter algorithm. |
weighted-discard | (Optional) Specifies the weighted discard algorithm. |
exp-weight | (Optional) Specifies the weight for the exponential moving average of loss rate. Valid values are from 1 to 4. |
cable downstream rate-limit, which enforces strict DOCSIS-complaint rate limiting.
Interface configuration
| Release | Modification |
|---|---|
11.3(6)NA | This command was first introduced. |
When you enter this command without an option, it enables strict DOCSIS-compliant rate limiting, which sets the burst rate to the interface speed.
The following example applies the token bucket filter algorithm:
Router(config-if)# cable downstream rate-limit token-bucket
| Command | Description |
Sets the DOCSIS rate limit for an upstream port. |
To specify the number of days to age the cable modem from the flap-list table, use the cable flap-list aging global configuration command. Use the no form of this command to disable this feature.
cable flap-list aging number of days
number of days | Specifies how many days of cable modem performance is retained in the flap list. Valid values are from 1 to 60. |
No default behavior or values.
Global configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
A flap list is a table maintained by the Cisco uBR7246 for every modem (active or not) that is having communication difficulties. The cable flap list tracks the cable modem MAC address up and down transitions, registration events, missed periodic ranging packets, upstream power adjustments, and the CMTS physical interface. (Flapping refers to the rapid disconnecting and reconnecting of a cable modem that is having problems holding a connection.) The flap list contains modem MAC addresses and logs the time of the most recent activity. You can configure the size and entry thresholds for the flap list.
The following example specifies that the flap-list table retain two days of performance for this cable modem:
Router(config)# cable flap-list aging 2
| Command | Description |
Sets the insertion time interval. | |
Specifies the power-adjustment threshold for recording a flap-list event. | |
Specifies the maximum number of modems that can be reported to the flap-list table. | |
Resets the flap-list table. |
To set the insertion time interval, use the cable flap-list insertion-time global configuration command. Use the no form of this command to disable insertion time.
cable flap-list insertion-time seconds
seconds | Insertion time interval in seconds. Valid values are from 60 to 86400. |
No default behavior or values.
Global configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
This command controls the operation of a flapping modem detector. When the link establishment rate of a modem is shorter than the period defined by this command, the modem is placed in the flap list.
The following example sets the insertion time interval to 62 seconds:
Router(config)# cable flap-list insertion-time 62
| Command | Description |
Specifies when a modem's entry in the flap-list table will be deleted. | |
Specifies the power-adjustment threshold for recording a flap-list event. | |
Specifies the maximum number of modems that can be reported to the flap-list table. | |
Resets the flap-list table. |
To specify the power-adjust threshold for recording a flap-list event, use the cable flap-list power-adjust threshold global configuration command. Use the no form of this command to disable power-adjust thresholds.
cable flap-list power-adjust threshold dBmV
dBmV | Decibels per millivolt. Valid values are from 1 to 10. |
No default behavior or values.
Global configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
This command controls the operation of a flapping modem detector. When the power adjustment of a modem exceeds the threshold, the modem is placed in the flap list.
The following example shows the power-adjust threshold to 1:
Router(config)# cable flap-list power-adjust threshold 1
| Command | Description |
Specifies when a modem's entry in the flap-list table will be deleted. | |
Sets the insertion time interval. | |
Specifies the maximum number of modems that can be reported to the flap-list table. | |
Resets the flap-list table. |
To specify the maximum number of modems reported in the flap-list table, use the cable flap-list size global configuration command. Use the no form of this command to specify the default flap-list table size.
cable flap-list size number
number | Specifies the number of modems that report flap performance to the flap-list table. Valid values are from 1 to 8191. |
The default cable flap-list size is 8192.
Global configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example limits the flap-list table size to no more than 2 modems:
Router(config)# cable flap-list size 2
| Command | Description |
Specifies when a modem's entry in the flap-list table will be deleted. | |
Sets the insertion time interval. | |
Specifies the power-adjustment threshold for recording a flap-list event. | |
Resets the flap-list table. |
To specify a destination address for User Datagram Protocol (UDP) broadcast (DHCP) packets, use the cable helper-address interface configuration command. Use the no form of this command to disable this feature.
cable helper-address IP-address {cable-modem | host}
IP-address | The IP address of a DHCP server. |
cable-modem | Specifies that only cable modem UDP broadcasts are forwarded. |
host | Specifies that only host UDP broadcasts are forwarded. |
No default behavior or values.
Interface configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
If you specify a secondary interface address, the giaddr field in the DHCP requests will be sent to the primary address for DHCP requests received from cable modems, and to the secondary IP address for DHCP requests received from hosts.
The following example forwards UDP broadcasts from cable modems to the DHCP server at 172.23.66.44:
Router(config-if)# cable helper-address 172.23.66.44 cable-modem
The following example forwards UDP broadcasts from hosts to the DHCP server at 172.23.66.44:
Router(config-if)# cable helper-address 172.23.66.44 host
To set the time between opportunities for cable modems to request a connection from the Cisco uBR7246, use the cable insertion-interval interface configuration command. Use the no form of this command to use the automatic setting and ignore any minimum or maximum time settings.
cable insertion-interval [automatic] [min | max]
automatic | Causes the Cisco uBR7246 MAC scheduler for each upstream modem to vary the frequency of initial ranging slots used by new modems joining the network. |
min | Minimum time in milliseconds that the cable modem termination system (CMTS) is allowed to vary the initial ranging slot time. Valid values are from 25 to 200. Default is 50 milliseconds. |
max | Maximum time in milliseconds that the CMTS is allowed to vary the initial ranging slot time. Valid values are from 500 to 2000. Default is 2000 milliseconds (that is, 2 seconds). |
automatic (dynamically varying the frequency of initial ranging upstream slots between 50 milliseconds to 2 seconds).
Interface configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
Use this command to configure the frequency at which the initial maintenance interval is to appear in MAP messages. MAP messages define the precise time intervals during which modems can transmit.
Use the automatic keyword with this command when you have to bring a lot of modems on line quickly (for example, after a major power failure). Override the automatic keyword by specifying an insertion interval.
The following example specifies the automatic setting:
Router(config-if)# cable insertion-interval automatic
| Command | Description |
Sets the time interval that a modem must wait after a failed attempt to connect to the uBR7246. |
To specify that IP multicast streams be encrypted, use the cable match address interface configuration command. Use the no form of this command if you do not want to use encryption.
cable match address access-list
access-list | Specifies that the IP multicast streams defined by the access list be encrypted. Access lists can be IP access list numbers or an IP access list name. Valid access list numbers are from 100 to 199. |
No default behavior or values.
Interface configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
Configure the access list using the ip access-list command.
The following example specifies that the multicast stream defined by the access list named reno be encrypted:
Router(config-if)# cable match address reno
The following example specifies that the multicast stream defined by the access list number 102 be encrypted:
Router(config-if)# cable match address 102
| Command | Description |
ip access-list | Defines an IP access list by name. |
To define the modulation profile, use the cable modulation-profile global configuration command. Use the no form of this command to remove the specified modulation profile.
cable modulation-profile profile iuc fec-tbytes fec-len burst-len guard-t mod scrambler seed diff pre-len last-cw uw-len
profile | Modulation profile number. |
iuc | Interval usage code. Valid entries are: initial, long, request, short, or station. |
fec-tbytes | The number of bytes that can be corrected per FEC code word. Valid values are from 0 to 10, where 0 means no FEC. |
fec-len | FEC code word length. Valid values are from 16 to 253. |
burst-len | Maximum burst length in minislots. Valid values are from 0 to 255, where 0 means no limit. |
guard-t | Guard time in symbols. The time between successive bursts. |
mod | Modulation. Valid entries are 16qam and qpsk. |
scrambler | Enable or disable scrambler. Valid entries are scrambler and no-scrambler. |
seed | Scrambler seed in hexidecimal format. Valid values are from 0x0000 to 0x7FFF. |
diff | Enable or disable differential encoding. Valid entries are diff and no-diff. |
pre-len | Preamble length in bits. Valid values are from 2 to 128. |
last-cw | Handling of FEC for last code word. Valid entries are fixed for fixed code word length and shortened for shortened last code word. |
uw-len | Upstream unique word length. Enter uw8 for 8-bit unique words or uw16 for 16-bit unique code words. |
No default behavior or values.
Global configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
You can use the no form of this command to remove all modulation profiles except modulation profile 1. In the case of modulation profile 1, the no form of this command sets all of the parameters in a burst to default values.
 | Caution Changes to modulation profiles causes changes to the physical layer. Because changing physical layer characteristics affects router performance and function, this task should be reserved for expert users. |
The following example defines the burst parameters for profile 2 as follows:
The request burst is defined to have 0 fec-tbytes, 16 kbytes fec-len, a burst-len of 1, a guard time of 8, a mod value of qpsk, scrambler enabled with a seed value of 152, differential encoding disabled, a preamble length of 64 bits, a fixed code word length, and 8-bit unique words for upstream unique word length. The remaining initial, station, short, and long bursts are defined in similar fashion for profile 2.
Router(config)# cable modulation-profile 2 request 0 16 1 8 qpsk scrambler 152 no-diff 64 fixed uw8 Router(config)# cable modulation-profile 2 initial 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed uw16 Router(config)# cable modulation-profile 2 station 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed uw16 Router(config)# cable modulation-profile 2 short 6 75 6 8 16qam scrambler 152 no-diff 144 fixed uw8 Router(config)# cable modulation-profile 2 long 8 220 0 8 16qam scrambler 152 no-diff 160 fixed uw8
See the show cable modulation-profile command for a description of the output display fields.
| Command | Description |
Assigns a modulation profile to an interface. | |
Displays a modulation profile group's information. |
To enable privacy in the system, use the cable privacy interface configuration command. Use the no form of this command to disable privacy.
cable privacy [mandatory | authenticate-modem | authorize-multicast]
mandatory | (Optional) Enforce Baseline Privacy for all modems. |
authenticate-modem | (Optional) Use AAA protocols to authenticate all modems during BPI initialization. |
authorize-multicast | (Optional) Use AAA protocols to authorize all multicast stream (IGMP) join requests. |
mandatory
Interface configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
While the default for this command is to enable privacy, it is not mandatory.
The following example displays the options available with this command:
Router(config-if)# cable privacy ? authenticate-modem turn on BPI modem authentication authorize-multicast turn on BPI multicast authorization kek KEK Key Parms mandatory force privacy be mandatory tek TEK Key Parms
The following example forces Baseline Privacy to be used for all modems:
Router(config-if)# cable privacy mandatory
The following example turns on BPI modem authentication:
Router(config-if)# cable privacy authenticate-modem
The following example turns on BPI muticast authorization:
Router(config-if)# cable privacy authorize-multicast
| Command | Description |
Reports the on line status of the specified cable modem. |
To specify permission for updating the QoS table, use the cable qos permission global configuration command. Use the no form of this command to remove a previously enabled permission.
cable qos permission {create-snmp | modems | update-snmp}
create-snmp | Permits creation of QoS table entries by Simple Network Management Protocol (SNMP). |
modems | Permits creation of QoS table entries by modem registration requests. |
update-snmp | Permits dynamic update of QoS table entries by SNMP. |
Enable by modem and SNMP.
Global configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example enables modems to request arbitrary QoS parameters:
Router(config)# cable qos permission modems
| Command | Description |
Configures a quality of service (QoS) profile. | |
Displays the status of the QoS table permissions. | |
Displays QoS profiles. |
To configure a QoS profile, use the cable qos profile global configuration command. Use the no form of this command to either set default values for profile group numbers 1 or 2, or remove the QoS profile if no specific parameters remain.
cable qos profile {groupnum | guaranteed-upstream | max-burst | max-upstream | max-downstream | priority | tos-overwrite | value}
groupnum | QoS profile group number. Qos profiles 1 and 2 are required by the system. QoS profile 1 is used during registration, and QoS profile 2 is the default QoS profile. Both profiles are preconfigured and cannot be removed. However, you can modify these profiles. |
guaranteed-upstream | Guaranteed minimum upstream rate in kilobytes per second. Valid values are from 0 to 100000. Default value is 0 (no reserved rate). |
max-burst | Maximum upstream transmit burst size in bytes that the modem can send for any single transmit burst. Valid values are from 0 to 255. Default value is 0 (no limit). |
max-upstream | Maximum upstream data rate in kilobytes per second that a modem using this QoS profile will receive. Valid values are from 0 to 255. Default value is 0 (no upstream rate limit). |
max-downstream | Maximum downstream data rate in kilobytes per second that a modem using this QoS profile will receive. Valid values are from 0 to 255. Default value is 0 (no downstream rate limit). |
priority | Relative priority number assigned to upstream traffic by this QoS profile. Valid values are from 0 to 7, with 7 being the highest priority. Default value is 0. |
tos-overwrite | Overwrite the Type of Service (TOS) field in the IP datagrams received on the upstream before forwarding them downstream (or IP backbone). This parameter sets the hexadecimal mask bits to a hexadecimal value. This helps the CMTS identify datagrams for QoS on the backbone. |
value | The value substituted for the TOS value. See tos_overwrite. |
No default behavior or values.
Global configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example configures QoS profile 4 with guaranteed upstream of 2 kbps, maximum transmission burst of 2, maximum downstream rate of 3 kbps, with a priority of 4, cable baseline privacy set, and a tos-overwrite mask and value byte (in hex) of 0x2:
Router(config)# cable qos profile 4 guaranteed-upstream 2 Router(config)# cable qos profile 4 max-burst 2 Router(config)# cable qos profile 4 max-downstream 3 Router(config)# cable qos profile 4 priority 4 Router(config)# cable qos profile 4 tos-overwrite 0x2
| Command | Description |
Configures permissions for updating the QoS table. | |
Displays QoS profiles. |
To enable the system to insert the cable modem MAC address into a DHCP packet received from a modem or host and forward the packet to a DHCP server, use the cable relay-agent-option interface configuration command. Use the no form of this command to disable insertion.
cable relay-agent-optionThis command has no keywords or arguments.
no cable relay-agent-option
Interface configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
This functionality enables a DHCP server to identify the user (cable modem) sending the request and initiate appropriate action based on this information.
The following example enables the insertion of DHCP relay agent information into DHCP packets:
Router(config-if)# cable relay-agent-option
To configure authentication and data privacy parameters, use the cable shared-secret interface configuration command. Use the no form of this command to disable authentication during the modem's registration phase.
cable shared-secret [0 | 7] authentication-key
0 | (Optional) Specifies that an unencrypted message will follow. |
7 | (Optional) Specifies that an encrypted message will follow. |
authentication-key | Text string is a shared secret string. When you enable the service password-encryption option, the password is stored in encrypted form. The text string is a 64-character authentication key. |
no cable shared-secret
Interface configuration
| Release | Modification |
|---|---|
11.3 XA | This command was first introduced. |
The following example activates cable modem authentication, using "3344912349988...sf" as the shared secret key and indicating that an encrypted message follows:
router(if-config)# cable shared-secret 7 3344912349988cisco@xapowenaspasdpuy230jhm...sf
To configure a continuous band setting for a spectrum group, use the cable spectrum-group band global configuration command. Use the no form of this command to delete the band settings for a spectrum group.
cable spectrum-group group-number [time day hh:mm:ss] [delete] band start-freq-hz end-freq-hz [power-level-dbmv]
group-number | Spectrum group number. Valid values are from 1 to 32. |
time day hh:mm:ss | (Optional) For scheduled spectrum groups, makes the band setting available at the specified time in hours (hh), minutes (mm), and seconds (ss). |
delete | (Optional) Removes the band setting from use at the specified time. |
band | Specifies that a continuous band setting be used in this group. |
start-freq-hz | Lower boundary of the frequency band. |
end-freq-hz | Upper boundary of the frequency band. |
power-level-dbmv | (Optional) Nominal input power level in decibels per millivolt (dBmV). Valid values are from -10 to +10. Some cable plants might want to change only the input power level and not frequency on a daily time schedule. |
No default behavior or values.
Global configuration
| Release | Modification |
|---|---|
11.3 XA1 | This command was first introduced. |
This command specifies that a continuous band setting be used as a unit of allocated spectrum within this spectrum group. Cable plants can choose to set up a daily schedule that changes the input power level and not the frequency.
The following example specifies that all the upstream ports for spectrum-group 4 share the same spectrum from 5000004 Hz to 40000000 Hz with a power level of 5 dBmV on Mondays at noon:
Router(config)# cable spectrum-group 4 time Monday 12:00:00 band 5000004 40000000 5
The following example deletes the frequency band created in the previous example:
Router(config)# cable spectrum-group 4 time Monday 12:00:00 delete band 5000004 40000000 5
To configure a spectrum group to use a center frequency, use the cable spectrum-group frequency global configuration command. Use the no form of this command to delete the configured frequency setting for this spectrum group.
cable spectrum-group groupnum [time day hh:mm:ss] [delete] frequency freq-hz [dBmV]
groupnum | Spectrum group number. Valid values are from 1 to 32. |
time day hh:mm:ss | (Optional) Makes the frequency setting available at the specified time in hours (hh), minutes (mm), and seconds (ss). |
delete | (Optional) Removes the frequency setting from use at the specified time. |
frequency | Specifies that a center frequency setting should be used in this group. |
freq-hz | Upstream center frequency in Hertz. Valid values are from 5,000,000 to 42,000,000. Half of the upstream carrier energy is distributed above and half is distributed below the specified frequency. |
dBmV | (Optional) Nominal input power level in decibels per millivolt (dBmV). Valid values are from -10 to +10. |
No default behavior or values.
Global configuration
| Release | Modification |
|---|---|
11.3 XA1 | This command was first introduced. |
A spectrum group allows the upstream frequency and input power level to change whenever noise impairs upstream traffic.
Cable plants can choose to set up a daily schedule that changes the input power level and not the frequency.
The following example configures spectrum group 4 with an upstream frequency of 5000004 Hz and a power level of 5 dBmV:
Router(config)# cable spectrum-group 4 frequency 5000004 5
To set the frequency-hop period, use the cable spectrum-group hop period global configuration command. Use the no form of this command to delete the frequency hop period for this spectrum group.
cable spectrum-group groupnum hop period seconds
groupnum | Spectrum group number. Valid values are from 1 to 32. |
seconds | Specifies the frequency-hop time period in seconds. Valid values are from 1 to 3600. |
300 seconds
Global configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example sets the frequency-hop period to 60 seconds:
Router(config)# cable spectrum-group hop period 60
| Command | Description |
Sets the hop threshold for a spectrum group. |
To specify a hop threshold for a spectrum group, use the cable spectrum-group hop threshold global configuration command. Use the no form of this command to delete the hop threshold for this spectrum group.
cable spectrum-group groupnum hop threshold [percent]
groupnum | Spectrum group number. Valid values are from 1 to 32. |
percent | (Optional) Specifies the hop threshold in percentage of capacity. Valid range of modems used is 1 to 100. |
100 percent
Global configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example sets the threshold which triggers frequency hop to 20% for
spectrum-group 4:
Router(config)# cable spectrum-group 4 hop threshold 20
| Command | Description |
Defines the frequency-hop period. |
To specify that the upstream ports share the same spectrum, use the cable spectrum-group shared global configuration command. Use the no form of this command to delete the spectrum group.
cable spectrum-group groupnum shared
groupnum | Spectrum group number. Valid values are from 1 to 32. |
Upstream port frequency the same for all ports in the spectrum group.
Global configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
Because this command forces upstream ports to use the same spectrum, do not use this command for overlapping carriers.
The following example specifies that all the upstream ports for spectrum-group 4 share the same spectrum:
Router(config)# cable spectrum-group 4 shared
To specify the percentage overbooking rate, use the cable upstream admission-control interface configuration command. Use the no form of this command to disable upstream admission control.
cable upstream portnum admission-control percentage
portnum | Specifies the upstream port. |
percentage | Specifies the percentage overbooking rate to limit overbooking. Valid values are from 100 to 10000. |
Disabled
Interface Configuration
| Release | Modification |
|---|---|
11.3(6)NA | This command was first introduced. |
The following example limits overbooking on upstream port 4 to 1000%:
Router(config-if)# cable upstream 4 admission-control 1000
To specify an upstream channel width, use the cable upstream channel-width interface configuration command. Use the no form of this command to set the channel width to 1600000 for a port number.
cable upstream portnum channel-width width
portnum | Specifies the port number. |
width | Specifies upstream channel width in hertz (Hz). Valid values are 200000 (160000 symbols/sec), 400000 (320000 symbols/sec), 800000 (640000 symbols/sec), 1600000 (1280000 symbols/sec), and 3200000 (2560000 symbols/sec). |
1600000
Interface configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example configures port 2 with a channel width of 200,000 Hz (which is equivalent to a symbol rate of 160 ksym/s):
Router(config-if)# cable upstream 2 channel-width 200000
To specify automatic or fixed start and stop values for data backoff, use the cable upstream data-backoff interface configuration command. Use the no form of this command to use the default data backoff values.
cable upstream portnum data-backoff {automatic | start end}
portnum | Specifies the port number. |
automatic | Specifies automatic data backoff start and stop values. |
start | Specifies the start value. Valid values are from 0 to 15. |
end | Specifies the end value. Valid values are from 0 to 15. |
0 (start), 4 (end)
Interface configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
Cisco recommends that you use this automatic setting.
The following example sets the automatic values for port 2:
Router(config-if)# cable upstream 2 data-backoff automatic
To specify a minislot size, use the cable upstream minislot-size interface configuration command. Use the no form of this command to set the default minislot size of 8 if this is valid for the current channel width setting.
cable upstream portnum minislot-size size
portnum | Specifies the upstream port. |
size | Specifies the minislot size in number of time ticks. Valid minislot sizes are 2 (32 symbols), 4 (64 symbols), 8 (128 symbols), 16 (256 symbols), 32 (512 symbols), 64 (1024 symbols), and 128 (2048 symbols). |
8
Interface configuration
| Release | Modification |
|---|---|
11.3(6)NA | This command was first introduced. |
| Caution Using values of 64 or 128 for higher symbol rates such as 1280 Ksymb/sec or 2560 Ksymb/sec can cause performance problems. Depending on your current setting's symbol rate, you should select the minislot size (in ticks) that yields a minislot size of 32 or 64 symbols. |
The following example sets the minislot size on upstream port 4 to 16 (or 256 symbols):
Router(config-if)# cable upstream 4 minislot-size 16
To assign a modulation profile to an interface, use the cable upstream modulation-profile interface configuration command. Use the no form of this command to assign modulation profile 1 to the interface.
cable upstream portnum modulation-profile profile
portnum | Specifies the port number. |
profile | Assigns the modulation profile to the specified interface. |
Modulation profile 1
Interface configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example assigns modulation profile 8 to port (interface) 2:
Router(config-if)# cable upstream 2 modulation-profile 8
| Command | Description |
Defines the modulation profile. |
To specify automatic or configured initial ranging backoff calculation, use the cable upstream range-backoff interface configuration command. Use the no form of this command to set default values.
cable upstream portnum range-backoff {automatic | start end}
portnum | Specifies the port number. |
automatic | Specifies the fixed data backoff start and end values. |
start | Binary exponential algorithm. Sets the start value for data backoff. Valid values are from 0 to 15. |
end | Binary exponential algorithm. Sets the end value for data backoff. Valid values are from 0 to 15. |
0 (start), 4 (end)
Interface configuration
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example sets the range backoff to automatic for port 2:
Router(config-if)# cable upstream 2 range-backoff automatic
To set DOCSIS rate limiting for an upstream port on a cable modem card, use the cable upstream rate-limit interface configuration command. Use the no form of this command to disable DOCSIS rate limiting for an upstream port on a cable modem card.
cable upstream portnum rate-limit [token-bucket]
portnum | Specifies the upstream port. |
token-bucket | (Optional) Applies the token bucket filter algorithm. |
The rate limit of the cable upstream port.
Interface configuration
| Release | Modification |
|---|---|
11.3(6)NA | This command was first introduced. |
Use of the default value (the upstream port's rate limit) enforces strict DOCSIS-compliant rate limiting.
The following example uses the token bucket filter algorithm for upstream port 4:
Router(config-if)# cable upstream 4 rate-limit token-bucket
| Command | Description |
Enables DOCSIS rate limiting on downstream traffic. |
To reset the flap-list table, use the clear cable flap-list privileged EXEC configuration command.
clear cable flap-list [mac-addr | all]
mac-addr | (Optional) MAC address. Specify the 48-bit hardware address of an individual cable modem. |
all | (Optional) Remove all modems from the flap-list table. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example removes all the modems from the flap-list table:
Router# clear cable flap-list all
| Command | Description |
Specifies when a modem's entry in the flap-list table will be deleted. | |
Sets the insertion time interval. | |
Specifies the power-adjustment threshold for recording a flap-list event. | |
Specifies the maximum number of modems that can be reported to the flap-list table. |
To reset a cable modem's flapping counters to zero, use the clear cable modem counters privileged EXEC configuration command.
clear cable modem {mac-addr | ip-addr | all} counters
mac-addr | MAC address. Specify the 48-bit hardware address of an individual cable modem. |
ip-addr | IP address. Specify the IP address of an individual cable modem. |
all | Resets the flapping data for all modems. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example clears the counters for the modem at IP address 172.00.00.00:
Router# clear cable modem 172.00.00.00 counters
| Command | Description |
Removes the specified modem from the Station Maintenance List and resets the modem. |
To remove a modem from the Station Maintenance List and reset the modem, use the clear cable modem reset privileged EXEC configuration command.
clear cable modem {mac-addr | ip-addr | all} reset
mac-addr | MAC address. Specify the 48-bit hardware address of an individual cable modem. |
ip-addr | IP address. Specify the IP address of an individual cable modem. |
all | Removes all the cable modems from the Station Maintenance List. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
This command causes the link to the modem to drop. The modem responds by resetting itself. It can take up to 30 seconds for the modem to start the reset sequence.
The following example removes the cable modem at 172.00.00.00 from the Station Maintenance List:
Router# clear cable modem 172.00.00.00 reset
| Command | Description |
Clears the flapping counters for the specified modem. |
To determine whether a specific cable modem is on line, use the ping cable-modem privileged EXEC configuration command.
ping cable-modem mac-addr
mac-addr | Cable modem IP address. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
This ping is a MAC layer ping that uses extra keep-alive poll messages. It also uses smaller data units than a standard IP ping, which reduces the overhead. It will work even if the IP layer in the modem is down or not fully registered.
The following example confirms that the cable modem at 172.00.00.00 is connected to the network and is operational:
Router# ping cable-modem 172.00.00.00 172.00.00.00 is alive
To display the cable flap-list, use the show cable flap-list privileged EXEC configuration command.
show cable flap-list [sort-flap | sort-time]
sort-flap | (Optional) Sort by number of times the cable modem has flapped. |
sort-time | (Optional) Sort most recent time the cable modem is detected to have flapped. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following displays show the return for flap-list tables sorted by MAC address, by time, and by a specific upstream interface:
router# show cable flap-list sort-flap Mac Address Upstream Ins Hit Miss CRC P-Adj Flap Time .1eab.2c0b C6/0 U0 108 318 27 0 0 108 Sep 10 15:26:56 .1eb2.bb07 C6/0 U0 0 293 31 1 1 1 Sep 10 15:15:49 .7b6b.71cd C6/0 U0 1 288 32 0 0 1 Sep 10 15:12:13 .1eb2.bb8f C6/0 U0 1 295 30 0 0 1 Sep 10 15:11:44 router# Router# show cable flap-list sort-time Mac Address Upstream Ins Hit Miss CRC P-Adj Flap Time 00e0.2222.2202 C4/0 U0 464 2069 242 0 421 885 Oct 16 22:47:23 0010.7b6b.57e1 C4/0 U0 0 2475 43 0 1041 1041 Oct 16 22:47:04 router# router# show cable flap cable 3/0 MAC Address Upstream Ins Hit Miss CRC P-Adj Flap Time 0050.7366.1803 Cable3/0/U0 1787 3645 19861 0 !4 3578 Jan 17 03:28:35 0050.7366.17ab Cable3/0/U0 1785 3718 19817 0 !3 3573 Jan 17 03:28:29 0050.7366.1801 Cable3/0/U0 1785 3628 19781 0 !3 3573 Jan 17 03:28:25 0050.7366.17d3 Cable3/0/U0 1675 3934 19492 0 !35 3385 Jan 17 03:28:37 00d0.bad3.c459 Cable3/0/U0 407 8293 3450 0 0 796 Jan 17 03:28:25 0090.8330.0214 Cable3/0/U0 174 659 2657 0 0 348 Jan 17 03:28:31 0090.8330.020f Cable3/0/U0 173 624 2662 0 0 347 Jan 17 03:27:08 0090.8330.0213 Cable3/0/U0 173 648 2655 0 0 346 Jan 17 03:26:42 0090.8330.0211 Cable3/0/U0 173 579 2653 0 0 346 Jan 17 03:27:08
| Field | Description |
|---|---|
Mac Address | The customer account or street address. |
Upstream | The upstream port. |
Ins | The number of times the modem comes up and inserts itself into the network. This count is the number of times the RF link was reestablished more frequently than the time period configured in the cable flap-list insertion time command. It can indicate intermittent downstream sync loss or DHCP or modem registration problems. Each time this count increments, the flap count also increments. |
Hit | The number of times the modem responds to MAC layer keep alive messages. (The minimum hit rate is once per 30 seconds. It can indicate intermittent upstream, laser clipping, or common-path distortion. This count should be much higher than the Miss count. If this is not the case, the modem is having trouble maintaining the link because of an upstream problem. The flap count increments each time the system transitions from a Hit to a Miss. |
Miss | The number of times the modem misses the MAC layer keep-alive message. An 8% miss rate is normal for the MC11 card. It can indicate intermittent upstream, laser clipping, or common-path distortion. |
CRC | The number of upstream Cyclic Redundancy Check errors per modem. It can indicate intermittent upstream, laser clipping, or common-path distortion. |
P-Adj | The number of times the headend instructed the modem to adjust transmit (TX) power more than the threshold configured with the cable flap-list power-adjust threshold command. It can indicate amplifier degradation, poor connections, or thermal sensitivity. Each time this counter increments, the flap count increments. |
Flap | The sum of P-Adj and Ins values. Modems with high flap counts will have high SIDs and might not register. |
Time | The most recent time that the modem dropped the connection. |
To view configuration settings on the Cisco uBR7246, use the show cable EXEC command.
show cable modem [ip-address | mac-address]
ip-address | (Optional) Specify the IP address of the modem. |
mac-address | (Optional) Specify the MAC address of the modem. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 XA | This command was first introduced. |
This command displays information on all cable modems or a particular cable modem on the network.
The following are sample outputs from the show cable modem command:
router# show cable modem
Interface SID Online Timing Receive QoS IP address MAC address
State Offset Power
Cable6/0/U0 1 online 3046 -2.00 4 10.30.128.35 0010.7b6b.7213
Cable6/0/U0 2 online 3047 0.00 4 10.30.128.34 0010.7bb3.fbdd
Cable6/0/U0 3 offline 3033 6.75 2 0.0.0.0 0020.4001.3e66
Table 2 describes the fields shown in the show cable modem display.
| Field | Description |
|---|---|
Interface | The interface on which the cable modem has an active connection and the upstream port on the interface that is being used by the cable modem. |
SID | The service identifier assigned to the modem. |
Online State | The status of the cable modem. |
Timing offset | The cable modem's current timing adjustment in units of the 10.24 MHz time base tick. |
Receiver Power | The receive power level of the modem. |
QoS | The service class assigned to the modem. |
IP address | IP address of the modem. |
MAC address | Media access layer address. |
| Command | Description |
show cable burst-profile | Displays the upstream data burst profiles used to configure the upstream PHY. |
Defines modulation profile group information. | |
Enables system-wide privacy. | |
Configures permissions for updating the QoS table. | |
Configures QoS profiles. | |
Configures a continuous band setting for a spectrum group. | |
Configures a spectrum group to use a specified frequency. | |
Configures the frequency-hop period. | |
Defines a hop threshold for the specified spectrum group. | |
Configures upstream ports to share the same spectrum. |
profile | (Optional) Profile number. Valid values are from 1 to 8. |
iuc-code | (Optional) Internal usage code. Valid options are: initial Initial Ranging Burst |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 XA | This command was first introduced. |
This command displays modulation profile group information. A modulation profile is a collection of six burst profiles that are sent out in an upstream channel descriptors (UCD) message to configure a modem's transmit parameters for the following upstream message types: request, initial maintenance, station maintenance, short grant, and long grant.
The following is sample output from the show cable modulation-profile command:
router# show cable modulation-profile 1Mo IUC Type Preamb Diff FEC FEC Scrambl Max Guard Last Scrambl Preamb
length enco T CW seed B time CW offset
bytes size size size short1 request qpsk 64 no 0x0 0x10 0x152 1 8 no yes 56
1 initial qpsk 128 no 0x5 0x22 0x152 0 48 no yes 0
1 station qpsk 128 no 0x5 0x22 0x152 0 48 no yes 0
1 short qpsk 72 no 0x5 0x4B 0x152 0 8 no yes 48
Table 3 describes the fields shown in the show cable modulation-profile display.
.
| Field | Description |
|---|---|
Mo | Modulation profile group number. A modulation profile group is the set of burst profiles that define upstream transmit characteristics for the various types of upstream transmission classes. |
IUC | Interval usage code. Each upstream transmit burst belongs to a class which is given a number called the IUC. Bandwidth maps messages (MAP) by IUC codes used to allocate upstream time slots. The following types are currently defined:
|
Type | Modulation type. |
Preamb length | Preamble length. |
Diff enco | Differential encoding enabled (yes) or not enabled (no). |
FEC T bytes | Number of bytes that can be corrected for each FEC code word. |
FEC CW size | Size, in bytes, of the FEC codeword. |
Scrambl seed | Scrambler seed value in hex format. |
Max B size | Maximum burst size. |
Guard time size | Time between successive bursts measured in symbols. |
Last CW short | Handling of FEC for shortened last code word. |
Scrambl | Scrambler enabled (yes) or not enabled (no). |
Preamb offset | The bits to be used for the preamble value. |
| Command | Description |
show cable burst-profile | Displays the upstream data burst profiles used to configure the upstream PHY. |
Displays configuration settings for the specified cable modem. | |
Enables system-wide privacy. | |
Configures permissions for updating the QoS table. | |
Configures QoS profiles. | |
Configures a continuous band setting for a spectrum group. | |
Configures a spectrum group to use a specified frequency. | |
Configures the frequency-hop period. | |
Defines a hop threshold for the specified spectrum group. | |
Configures upstream ports to share the same spectrum. |
To display the status of permissions for changing QoS tables, use the show cable qos permission privileged EXEC configuration command.
cable qos permissionThis command has no keywords or arguments.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example displays the output of the show cable qos permission command:
Router# show cable qos permission Create by SNMP Update by SNMP Create by modems yes yes yes
Table 4 describes the fields shown in the show cable qos permission displays.
| Field | Description |
|---|---|
Create by SNMP | Indicates permission setting for creation of QoS table entries by Simple Network Management Protocol (SNMP). |
Update by SNMP | Indicates permission setting for creation of QoS table entries by modem registration requests. |
Create by modems | Indicates permission setting for dynamic updating of QoS table entries by Simple Network Management Protocol (SNMP). |
| Command | Description |
Configures permissions for updating the QoS table. | |
Configures QoS profiles. | |
Displays QoS profiles. |
To display QoS profiles, use the show cable qos profile privileged EXEC configuration command.
show cable qos profile service class
service class | Displays cable QoS table. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example displays the QoS tables for profiles 1, 2, 3, and 4:
Router# show cable qos profile
Service Prio Max Guarantee Max Max tx TOS TOS Create B
class upstream upstream downstream burst mask value by priv
bandwidth bandwidth bandwidth enab
1 0 0 0 0 0 0x0 0x0 cmts no
2 0 64000 0 1000000 0 0x0 0x0 cmts no
3 0 1000 0 1000 0 0x0 0x0 cmts no
4 7 2000000 100000 4000000 0 0x0 0x0 cm yes
Table 5 describes the fields shown in the show cable qos profile displays.
| Field | Description |
|---|---|
Service Class | Profile number. |
Prio | Priority level. |
Max upstream bandwidth | Maximum upstream bandwidth. |
Guarantee upstream bandwidth | Guaranteed minimum upstream bandwidth. |
Max downstream bandwidth | Maximum downstream bandwidth. |
Max tx burst | Maximum transmit burst size in bytes. Valid range is from 0 to the largest 16-bit integer. Default is 0. |
Tos mask | Hex value of the mask bits. |
Tos value | Value of the mask byte. |
Create by | Identity of the profile creator. |
B priv enab | Reports yes if Baseline Privacy is enabled for this QoS profile. Reports no if Baseline Privacy is not enabled for this Qos profile. |
| Command | Description |
Configures permissions for updating the QoS table. | |
Displays QoS profiles. | |
Displays the status of permissions for changing QoS tables. |
To display information about spectrum groups, use the show cable spectrum-group privileged EXEC configuration command.
show cable spectrum-group [groupnum]
groupnum | (Optional) Displays information about the specified group number. If no group number is specified, information for all spectrum groups is displayed. |
All spectrum groups
Privileged EXEC
| Release | Modification |
|---|---|
11.3 XA | This command was first introduced. |
The following are sample outputs from the show cable spectrum-group command for the upstream spectrum group named sales:
Router# show cable spectrum-group sales Spectrum Frequency Band Upstream Time Time Input Shared Group (MHz) Port Available Delete PowerLevel Topology 4 5.000-40.000 5 N 4 5.000 5 N 4 5.000-40.000 Mon 12:00:00 Mon 12:00:00 5 N 4 5.000 Mon 12:00:00 5 N
Table 6 describes the fields shown in the show cable spectrum-group displays.
| Field | Description |
|---|---|
Spectrum-Group | Identifies the spectrum group. |
Frequency Band (MHz) | Identifies the upper and lower ranges of the frequency for this spectrum group. |
Upstream Port | Identifies the upstream port number. |
Time Available | Identifies the day and time of day when this group is available. |
Time Delete | Identifies the day and time of day when this group will be deleted. |
Input PowerLevel | Identifies the assigned decibels per millivolt (dBmV) input level. |
Shared Topology | Indicates if upstreams are physically combined (share the same combiner group). Y or yes values indicate that upstreams which are members of the spectrum group are combined and cannot be assigned overlapping frequency bands. N or no values indicate that upstreams which are members of the of the spectrum group are not combined and can be assigned overlapping frequency bands. |
| Command | Description |
show cable burst-profile | Displays the upstream data burst profiles used to configure the upstream PHY. |
Displays configuration settings for the specified cable modem. | |
Displays modulation profile group information. | |
Enables system-wide privacy. | |
Configures permissions for updating the QoS table. | |
Displays QoS profiles. |
slot/port | Slot number/port number indicating the location of the Cisco MC11 cable modem card. |
upstream | (Optional) Displays upstream interface status. |
port | (Optional) Selects specific upstream port. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 XA | This command was first introduced. |
12.0(2)XC | This command was modified. |
The following is sample output from the show controllers cable upstream command for the modem located in slot 4, port 0:
Router# show controllers cable 4/0 upstream 2 Cable4/0 Upstream 2 is administratively down Frequency 5.008 MHz, Channel Width 0.200 MHz, QPSK Symbol Rate 0.160 Msps Spectrum Group 4 Nominal Input Power Level 5 dBmV, Tx Timing Offset 0 Ranging Backoff Start 16, Ranging Backoff End 16, Tx Backoff Start 16 Tx Backoff End 16, Modulation Profile Group 1 part_id=0x3137, rev_id=0x01, rev2_id=0xFF nb_agc_thr=0x0000, nb_agc_nom=0x0000 Range Load Reg Size=0x58 Request Load Reg Size=0x0E Minislot Size in number of Timebase Ticks is = 8 Minislot Size in Symbols =8 Bandwidth Requests = 0x0 Piggyback Requests = 0x0 Invalid BW Requests= 0x0 Minislots Requested= 0x0 Minislots Granted = 0x0 Minislot Size in Bytes = 2 UCD Count = 0 DES Ctrl Reg#0 = C00C0C43, Reg#1 = 0
Table 7 describes the fields shown in the show controllers cable upstream display.
| Field | Description |
|---|---|
Cable | Slot number/port number indicating the location of the Cisco MC11 cable modem card. |
Upstream is administratively down | Indicates the RF upstream interface is disabled. |
Frequency | Transmission frequency of the RF upstream channel. |
Channel Width | Indicates the width of the RF upstream channel. |
QPSK Symbol Rate | Indicates the modulation technique for upstream transmission. |
Spectrum Group 4 | Indicates the spectrum group associated with this slot and port. |
Nominal Input Power level | Indicates the desired power level coming into the receiver. |
Tx Timing Offset | Indicates the current ranging offset on the channel. |
Ranging Backoff Start | Indicates how many ranging slots to backoff before resending the ranging bursts after an upstream collision. Expressed as exponents of 2. See Ranging Backoff End. |
Ranging Backoff End | Indicates how many ranging slots to backoff before resending the ranging bursts after an upstream collision. Expressed as exponents of 2. See Ranging Backoff Start. |
Tx Backoff Start | Indicates the starting exponential backoff value for data collisions. |
Tx Backoff End | Indicates the ending exponential backoff value for data collisions. |
Modulation Profile Group | A set of burst profiles defining an upstream range. |
part_id= | The part number of the Phy chip. |
rev_id= | The Phy chip revision number. |
rev2_id= | The Phy chip sub-revision number. |
nb_agc_thr= | Threshold used to control gain. |
nb_agc_nom= | Used to accelerate convergence of input power level. |
Range Load Reg Size= | Size, indicated by number of symbols, for range request bursts. |
Request Load Reg Size= | Size, indicated by number of symbols, for request bursts. |
Minislot Size in number of Timebase Ticks is | Size in tick units of upstream minislot. A tick is 6.25 microseconds. |
Minislot Size in Symbols | Size in symbols of the upstream minislot. |
Bandwidth Requests | Number of successful bandwidth requests received in the contention minislots. |
Piggyback Requests | Number of successful bandwidth requests piggybacked with regular data transmissions. |
Invalid BW Requests | Number of invalid bandwidth (BW) requests. (An example of an invalid bandwidth request is a modem using a non-existent SID to request bandwidth. |
Minislots Requested | Total number of minislots requested. |
Minislots Granted | Total number of minislots granted. |
Minislot Size in Bytes | Size in bytes of the minislot. |
UCD Count | Number of UCDs sent for this upstream. |
DES Ctrl Reg # = | Interval DES controller register dump. |
| Command | Description |
Displays interface controllers information about the specified cable modem card slot. |
To display cable interface information, use the show interface cable privileged EXEC command.
show interface cable slot/port [downstream | upstream]
slot/port | Identifies the Cisco uBR7200 chassis slot number and downstream port number. Valid values are from 3 to 6. |
downstream | (Optional) Displays cable downstream port information for a cable modem. |
upstream | (Optional) Displays cable upstream port information for a cable modem. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 XA | This command was first introduced. |
The following is sample output for the cable modem located in slot 6/port 0 from the show interface cable command:
router# show interface cable 6/0
Cable6/0 is up, line protocol is up
Hardware is BCM3210 FPGA, address is 00e0.1e5f.7a60 (bia 00e0.1e5f.7a60)
Internet address is 1.1.1.3/24
MTU 1500 bytes, BW 27000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation, loopback not set, keepalive not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 4d07h, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
10908 packets input, 855000 bytes, 0 no buffer
Received 3699 broadcasts, 0 runts, 0 giants, 0 throttles
3 input errors, 3 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
5412 packets output, 646488 bytes, 0 underruns
0 output errors, 0 collisions, 13082 interface resets
0 output buffer failures, 0 output buffers swapped out
Table 8 describes the fields shown in the show interface cable display.
| Field | Description |
|---|---|
Cable slot/port is up/...administratively down | Indicates whether the interface hardware is currently active or taken down by the administrator. |
line protocol is up/...administratively down | Indicates whether the software processes that handle the line protocol believe the interface is usable or if it has been taken down by the administrator. |
hardware | Hardware type and address. |
Internet address | Internet address followed by subnet mask. |
MTU | Maximum Transmission Unit (MTU) of the interface. |
BW | Bandwidth of the interface in kilobits per second. |
DLY | Delay of the interface in microseconds. |
rely | Reliability of the interface as a fraction of 255, calculated as an exponential average over 5 minutes. (For example, 255/255 is 100% reliability.) |
load | Load on the interface as a fraction of 255, calculated as an exponential average over 5 minutes. (For example, 255/255 is complete saturation.) |
Encapsulation | Encapsulation method assigned to this interface. |
ARP type | Type of Address Resolution Protocol (ARP) and timeout value assigned. |
Last input | Number of hours, minutes, and seconds since the last packet was successfully received by an interface. |
output | Number of hours, minutes, and seconds since the last packet was successfully transmitted by an interface. |
Last clearing of "show interface" counters | Time at which the counters that measure cumulative statistics (such as number of bytes transmitted and received) were last reset to zero. |
Queueing strategy | Displays the type of queueing configured for this interface. In the following example output, the type of queueing configured is First In First Out (FIFO). |
Output queue | Number of packets in the output queue. The format of this number is A/B, where A indicates the number of packets in the queue, and B indicates the maximum number of packets allowed in the queue. |
drops | Indicates the number of packets dropped due to a full queue. |
input queue/drops | Number of packets in the input queue. The format of this number is A/B, where A indicates the number of packets in the queue, and B indicates the maximum number of packets allowed in the queue. |
drops | Indicates the number of packets dropped due to a full queue. |
Five minute input rate | Average number of bits and packets transmitted per second in the last five minutes. |
packets input | Total number of error-free packets received by the system. |
bytes input | Total number of bytes, including data and MAC encapsulation, in the error-free packets received by the system. |
no buffer | Number of received packets discarded because there was no buffer space in the main system. |
Received broadcast | Total number of broadcast or multicast packets received by the interface. |
runts | Number of packets that are discarded because they are smaller than the medium's minimum packet size. |
giants | Number of packets that are discarded because they exceed the medium's maximum packet size. |
input errors | Includes runts, giants, no buffers, CRC, frame, overrun, and ignored counts. |
CRC | Indicates the number of times the cyclic redundancy checksum generated by the originating LAN station or far-end device does not match the checksum calculated from the data received. |
frame | Number of packets received incorrectly having a CRC error and a non-integer number of octets. |
overrun | Number of times the receiver hardware was unable to forward received data to a hardware buffer because the input rate exceeded the receiver's ability to handle the data. |
ignored | Number of received packets ignored by the interface because the interface hardware ran low on internal buffers. |
packets output | Total number of messages transmitted by the system. |
bytes | Total number of bytes, including data and MAC encapsulation, transmitted by the system. |
underruns | Number of times the transmitter has been running faster than the receiving device can handle. |
output errors | Sum of all errors that prevented the final transmission of packets out of the interface being examined. |
collisions | Not applicable to the Cisco uBR7246. |
interface resets | Number of times an interface has been completely reset. |
output buffer failures | Number of times the output buffer has failed. |
output buffer swapped out | Number of times the output buffer has been swapped out. |
The following is sample output for the downstream cable interface of slot 6 on port 0 from the show interface cable downstream command:
router# show interface cable 6/0 downstream
Cable6/0: Downstream is up
111947771 packets output, 1579682655 bytes, 0 discarded
0 output errors
Table 9 describes the fields shown in the show interface cable downstream display.
| Field | Description |
|---|---|
Cable | Indicates the location of the downstream interface. |
Downstream is up/...administratively down | Indicates the administrative state of the interface. |
packets output | Total number of packets transmitted out of this interface. |
bytes | Total number of bytes transmitted out of this interface. |
discarded | Total number of packets discarded. |
output errors | Sum of all errors that prevented downstream transmission of packets out of this interface. |
The following is sample output for the upstream cable interface located in slot 6/port 0 from the show interface cable upstream command:
router# show interface cable 6/0 upstream Cable6/0: Upstream 0 is upReceived 3699 broadcasts, 0 multicasts, 28586 unicasts 0 discards, 0 errors, 0 unknown protocol 21817 packets input, 0 corrected, 0 uncorrectable 0 noise, 0 microreflections Guaranteed-rate service queue depth:0 Best-effort service queue depth:0 Total Modems On This Upstream Channel:3 (3 active) Current Total Bandwidth Reserved:192000 bps Current Admission Control Status: ENFORCED Percentage of Oversubscription: 200% Reservation Limit (with Oversubscription):5120000 bps Last Minislot Stamp (current_time_base):190026 FLAG:1 Last Minislot Stamp (scheduler_time_base):200706 FLAG:1
Table 10 describes the fields shown in the show interface cable upstream display.
| Field | Description |
|---|---|
Cable | Indicates the location of the upstream interface. |
Upstream is up/...administratively down | Indicates the administrative state of the upstream interface. |
Received broadcasts | Number of broadcast packets received through this upstream interface. |
multicasts | Number of multicast packets received through this upstream interface. |
unicasts | Number of unicast packets received through this interface. |
discards | Number of packets discarded by this interface. |
errors | Sum of all errors that prevented upstream transmission of packets through this interface. |
unknown protocol | Number of packets received that were generated using a protocol unknown to the Cisco uBR7246. |
packets input | Number of packets received through this upstream interface that were free from errors. |
corrected | Number of error packets received through this upstream interface that were corrected. |
uncorrectable | Number of error packets received through this upstream interface that could not be corrected. |
noise | Number of upstream packets corrupted by line noise. |
microreflections | Number of upstream packets corrupted by microreflections. |
Guaranteed-rate service queue depth | Number of bandwidth requests queued up in the Guarantee-rate queue. This queue is only available to modems that have a reserved minimum upstream rate in their Class of Service. |
Best-effort service queue depth | Number of bandwidth requests queued up in the Best-effort queue. This queue is available to all modems that do not have any reserved rate on the upstream. |
Total Modems On This Upstream Channel | Number of cable modems currently sharing this upstream channel. This field also shows how many of these modems are active. |
Current Total Bandwidth Reserved | Total amount of bandwidth reserved by all modems sharing this upstream channel that require bandwidth reservation. The Class of Service for these modems specifies some non-zero value for the guaranteed-upstream rate. When one of these modems is admitted on the upstream, this field value is incremented by this guaranteed-upstream rate value. |
Current Admission Control Status | Indicates the status of admission control on the upstream channel. ENFORCED status allows users to enable admission control on a per port basis. This controls how limited bandwidth is allocated. NOT ENFORCED status indicates that there is no admission control. Every modem that registers with a class of service specifying a minimum upstream rate will be admitted by the CMTS regardless of how much aggregate bandwidth is actually available. Users enable admission control via the admission control CLI. |
Percentage of Oversubscription | Amount of oversubscription to allow on this upstream channel. Oversubscription is expressed as a percentage of the raw capacity of the channel. In the example shown, an oversubscription rate of 200% on a 2.56 Mbps channel allows the cumulative bandwidth reservation on this channel to reach 5.12 Mbps before modems configured with non-zero reserved upstream rates are denied service. |
Reservation Limit (with Oversubscription) | Maximum cumulative bandwidth reservation allowable before rejecting new modems. In the example shown, this reservation limit with oversubscription is 5.12 Mbps. |
Last Minislot Stamp (current_time_base) | Indicates the current minislot count at the CMTS. FLAG indicates the timebase reference. This field is used only by developers. |
Last Minislot Stamp (scheduler_time_base) | Indicates the furthest minislot count allocated at the indicated time. FLAG indicates the timebase reference. This field is used by developers. |
| Command | Description |
Displays the service identifier information for each cable modem on the network. | |
Displays signal quality information for the specified slot. |
slot/port | Identifies the Cisco uBR7200 chassis slot number and downstream port number. Valid values are from 3 to 6. |
sid-number | (Optional) Identifies the service identification number. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 XA | This command was first introduced. |
Data transport over the RF link uses the registered SID address rather than the Ethernet address. This allows multiple hosts to access the network via a single cable modem.
The following are sample outputs from two uses of the show interface cable sid command:
router# show interface cable 6/0 sid SID Status QoS Creattime Inoctets Inpackets IP address MAC address 1 enable 2 57 80139964 101336 1.1.1.5 00e0.1eab.2c0b 2 enable 2 57 49132 649 1.1.1.7 00e0.1eb2.bb07 3 enable 2 58 80042891 100555 1.1.1.2 00e0.1eab.2c29 router# show interface cable 6/0 sid 1 SID Status QoS Creattime Inoctets Inpackets IP address MAC address 1 enable 2 57 80140204 101340 1.1.1.5 00e0.1eab.2c0b
If the value for the QoS group in the display appears as 0, it indicates that a temporary SID has been assigned to a cable modem that is in the process of connecting to the network:
router# show interface cable 6/0 sid SID Status QoS Creattime Inoctets Inpackets IP address MAC address 1 enable 0 57 80140204 101340 1.1.1.5 00e0.1eab.2c0b
If there are no cable modems connected to the cable interface you have selected, the display will appear as follows:
router# show interface cable 6/0 sid SID Status QoS Creattime Inoctets Inpackets IP address MAC address 1 Not in use
Table 11 describes the fields shown in the output for the show interface cable sid displays.
| Field | Description |
|---|---|
SID | Service identification number. |
Status | "Disable" means that the SID has been administratively disabled. "Enable" is the normal state. |
QoS | Quality of service. |
Creattime | When the SID was created, number of seconds since system booted. |
Inoctets | Number of octets received using this SID. |
Inpackets | Number of packets received using this SID. |
IP address | IP address of the modem owning this SID. |
MAC address | MAC address of the modem owning this SID. |
| Command | Description |
Displays signal quality information for the specified slot. |
slot/port | Identifies the Cisco uBR7200 chassis slot number and downstream port number. Valid values are from 3 to 6. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 XA | This command was first introduced. |
The following is sample output from the show interface signal quality command:
router# show interface cable 6/0 signal-quality Cable6/0: Upstream 0 is up includes contention intervals: TRUE
Table 12 describes the fields shown in the show controllers cable upstream display.
| Field | Description |
|---|---|
Cable | Interface name. |
Upstream is up includes contention intervals | States whether this statement is true. |
| Command | Description |
show interface | Displays information for all configured interfaces for the specified slot. |
Displays cable interface information for the specified slot. | |
Displays the service identifier information for each cable modem on the network. |
To run the acceptance test procedure on a port, use the test cable atp cable privileged EXEC configuration command.
test cable atp cable slot/port MAC-address category test-id
slot/port | Specifies upstream cable interface by slot and port number. |
MAC-address | Specifies the MAC address of the cable modem. |
category | Specifies the test category as being mac for MAC tests or mp for MAC-PHY tests. Valid MAC tests are 1 through 15. Valid MAC-PHY tests are 4 through 7. These categories of tests are described in the ATP documentation. |
test-id | Identifies a test specified in the automatic test procedure (ATP) documentation. The ATP documentation describes the collection of tests and the categories into which these tests are divided. |
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3(6)NA | This command was first introduced. |
You should read and understand the ATP documentation before using this command.
The ATP tests are organized into categories such as PHY, MP, MAC, and so forth. Tests within each category are labeled MP01, MP02, ..., MAC01, MAC02, and so forth. If you run a test from the CLI, you can omit the leading zero in the test ID.
In this release, Cisco supports only a subset of all of the tests.
The following example tests the upstream cable interface located in slot 2/port 0 at MAC address 1.1.1. The test specified is MAC-PHY test 4 (MP-04).
Router# test cable atp cable 2/0 1.1.1 mp 4 Running Upstream Channel Change (MP-04) Testing MP_04_UCD_FREQ_CHANGE Setting the upstream to 30MHz through UCD. Waiting 30 seconds for new frequency to be effective. 05:18:46: %UBR7200-5-USFREQCHG: Interface Cable2/0 Port U-1, frequency changed to 30.000 MHz Conducting connectivity test.
Some tests, such as the one shown below, produce volumious output:
Router#test cable atp c6/0 0010.7b43.aab9 8 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds: .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 8/8/8 ms *** 1-1. Normal TLV order UCD test started. Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/26/100 ms *** 1-1. Normal TLV order UCD test passed. Continue to next step?[confirm] *** 1-2. Reversed TLV order UCD test started. Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds: !!!!! ... !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/27/104 ms *** 2-6. negative burst descriptor(type 129, len 1; in Request msg) test passed. Continue to next step?[confirm] *** 2-7. undefined burst descriptor(type 12; in Short Data msg) test started. Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/26/100 ms *** 2-7. undefined burst descriptor(type 12; in Short Data msg) test passed. Continue to next step?[confirm] *** 2-8. Null burst descriptor(len 0, type 12; in Short Data msg) test started. Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/27/104 ms *** 2-8. Null burst descriptor(len 0, type 12; in Short Data msg) test passed. Continue to next step?[confirm] *** 2-9. negative burst descriptor(type 129, len 1; in Short Data msg) test started. Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/26/100 ms *** 2-9. negative burst descriptor(type 129, len 1; in Short Data msg) test passed. Continue to next step?[confirm] *** 3-1. Number of burst profiles test(#burst desc.in UCD > # burst profiles in MAP) started. Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds: !!!!! ... !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/26/100 ms *** 4-1. Long Grant without max. burst size test(Short Grant size=1) passed. Continue to next step?[confirm] *** 5-6. UCD count less than MAP change count test started. UCD count:19, next MAP change count:20 Station maintenance req failed UCD count:19, next MAP change count restored:19 *** 5-6. UCD count less than MAP change count test passed. Continue to next step?[confirm] *** 5-7. Stopping UCD test started. CM T1 timeout and reset (y/n)?[confirm] wait for CM to come up again. Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds: .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 8/34/112 ms *** 5-7. Stopping UCD test passed. Continue to next step?[confirm] ...
The following debug cable commands have been added to or modified in this release of the Cisco uBR7246 and are available to help you troubleshoot the cable interfaces:
For information on other debug cable commands, refer to the Voice, Video, and Home Applications Configuration Guide.
Use the debug cable mac EXEC command to display MAC-layer information for the specified cable modem. The no form of this command disables debugging output.
debug cable macThis command has no keywords or arguments.
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example shows the return for the MAC layer:
router# debug cable mac19:46:27: Ranging Modem with Sid 1 on i/f : Cable6/0/U019:46:27: Got a ranging request19:46:27: SID value is 1 on Interface Cable6/0/U019:46:27: CM mac address 00:E0:1E:B2:BB:0719:46:27: Timing offset is 019:46:27: Power value is FE0, or 0 dB19:46:27: Freq Error = 0, Freq offset is 019:46:27: Ranging has been successful for SID 1 on Interface Cable6/0/U019:46:29: Ranging Modem with Sid 2 on i/f : Cable6/0/U019:46:29: Got a ranging request19:46:29: SID value is 2 on Interface Cable6/0/U019:46:29: CM mac address 00:E0:1E:B2:BB:8F19:46:29: Timing offset is 119:46:29: Power value is 1350, or 0 dB19:46:29: Freq Error = 0, Freq offset is 019:46:29: Ranging has been successful for SID 2 on Interface Cable6/0/U019:46:32: Ranging Modem with Sid 3 on i/f : Cable6/0/U019:46:32: Got a ranging request19:46:32: SID value is 3 on Interface Cable6/0/U019:46:32: CM mac address 00:E0:1E:B2:BB:B119:46:32: Timing offset is FFFFFFFF19:46:32: Power value is 1890, or -1 dB19:46:32: Freq Error = 0, Freq offset is 019:46:32: Ranging has been successful for SID 3 on Interface Cable6/0/U019:46:34: Ranging Modem with Sid 5 on i/f : Cable6/0/U0
| Field | Description |
|---|---|
SID value is.... | Reports the service ID of the modem. The range is from 1 through 891. The information on this line should agree with the first line of the return (that is, Ranging Modem with Sid...). |
CM mac address.... | The MAC address of the specified cable modem. |
Timing offset is.... | The time by which to offset the frame transmission upstream so the frame arrives at the expected minislot time at the CMTS. |
Power value is FE0, or 0 dB | The raw value derived from the 3137 Broadcom chip. Alternately, the dB value specifies the relative change in the transmission power level that the cable modem needs to make so transmissions arrive at the CMTS at the desired power level. This desired power level is usually 0, but you can use the CLI to change it via the cable power-level command. |
Freq Error = .... | The raw value derived from the 3137 Broadcom chip. |
Freq offset is .... | Specifies the relative change in the transmission frequency that the cable modem will make to match the CMTS. |
| Command | Description |
Displays interface controller information for the specified slot. |
Use the debug cable map EXEC command to display map debugging messages. The no form of this command disables debugging output.
debug cable mapThis command has no keywords or arguments.
No default behavior or values.
Privileged EXEC
| Release | Modification |
|---|---|
11.3 NA | This command was first introduced. |
The following example displays all the MAP messages with and without data grants:
router# debug cable map 19:41:53: On interface Cable6/0, sent 5000 MAPs, 1321 MAPs had grant(s)Long Grants 13256993, Total Short Grants 223 A sample Map without any data grant ------------------ MAP MSG -------------------- us_ch_id: 1 ucd_count: 5 num_elems: 9 reserved: 0 Alloc Start Time: 33792 Ack Time: 33618 Rng_bkoff_start: 0 Rng_bkoff_end: 2 Data_bkoff_start: 1 Data_bkoff_end: 3: sid:16383 iuc:1 mslot_offset:0 sid:0 iuc:7 mslot_offset:40 A sample Map with data grant(s) ------------------ MAP MSG --------------------- us_ch_id: 1 ucd_count: 5 num_elems: 7 reserved: 0 Alloc Start Time: 33712 Ack Time: 33578 Rng_bkoff_start: 0 Rng_bkoff_end: 2 Data_bkoff_start: 1 Data_bkoff_end: 3 sid:2 iuc:6 mslot_offset:0 sid:16383 iuc:1 mslot_offset:16 sid:0 iuc:7 mslot_offset:40
| Field | Description |
|---|---|
sent 5000 MAPs | Total number of maps transmitted. |
MAPs had grant(s) Long Grants | Total number of grants considered long sized by CMTS. |
Total Short Grants | Total number of grants considered short sized by CMTS. |
us_ch_id | Identifies the upstream channel ID for this message. |
ucd_count | Number of upstream channel descriptors (UCDs). |
num_elems | Number of information elements in the map. |
reserved | Reserved for alignment. |
Alloc Start Time | Start time from CMTS initialization (in minislots) for assignments in this map. |
Ack Time | Latest time from CMTS initialization (in minislots) processed in upstream. The cable modems use this time for collision detection. |
Rng_bkoff_start | Initial backoff window for initial ranging contention, expressed as a power of 2. Valid values are from 0 to 15. |
Rng_bkoff_end | Final backoff window for initial ranging contention, expressed as a power of 2. Valid values are from 0 to 15. |
Data_bkoff_start | Initial backoff window for contention data and requests, expressed as a power of 2. Valid values are from 0 to 15. |
Data_bkoff_end | Final backoff window for contention data and requests, expressed as a power of 2. Valid values are from 0 to 15. |
sid | Service ID. |
iuc | Interval usage code (IUC) value. |
mslot_offset | Minislot offset. |
| Command | Description |
Displays interface controller information for the specified slot. |
For more information on the Cisco uBR7246, refer to the Voice, Video, and Home Applications Configuration Guide.
For instructions on the advanced configuration of the port adapters installed in your Cisco uBR7246, refer to the respective installation documents that shipped with each port adapter. This documentation is also available on the Cisco Documentation CD-ROM and on Cisco Connection Online (CCO).
For instructions on the advanced configuration of the cable modem cards, refer to the document Cisco uBR7246 Universal Broadband Router Cable Modem Card Installation and Configuration This document accompanies every Cisco cable modem card that is shipped from the factory as an installed item in a Cisco uBR7246 or as a field replaceable unit (FRU). The document is also available on the Cisco Documentation CD-ROM and on CCO.
Posted: Tue Dec 21 16:03:42 PST 1999
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