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September 27, 1999
These release notes for the Cisco uBR7200 series universal broadband routers describe the enhancements provided in Cisco IOS Release 12.0(6)SC, which is an early deployment release based on Cisco IOS Release 12.0(5)T. These release notes are updated as needed to describe memory requirements, new features, new hardware support, software platform deferrals, and related documents.
For a list of the software caveats that apply to Release 12.0(6)SC, see "Caveats for Release 12.0(6)SC" section.
Use these release notes with Cross-Platform Release Notes for Cisco IOS Release 12.0 located on Cisco Connection Online ( CCO) and the Documentation CD-ROM.
These release notes describe the following topics:
The Cisco uBR7200 series universal broadband routers---the Cisco uBR7223 and the Cisco uBR7246---are based on the Data Over Cable Service Interface Specification (DOCSIS) standards. Each is designed to be installed at a cable operator's headend facility or distribution hub and to function as the cable modem termination system (CMTS) for subscriber-end devices such as Cisco uBR904 and Cisco uBR924 cable access routers, and other DOCSIS-compliant cable modems.
Cisco uBR7200 series universal broadband routers allow two-way transmission of digital data and Voice over IP (VoIP) traffic over a hybrid fiber coaxial (HFC) network. For cable plants not fully upgraded to support two-way cable transmission, the routers support DOCSIS-compliant telco return, where the cable modem's return path to the CMTS is via a dial-up telephone line connection instead of an upstream channel over the coaxial cable.
These routers support IP routing with a wide variety of protocols and combinations of Ethernet, Fast Ethernet, serial, High-Speed Serial Interface (HSSI), Packet-over-Sonet (POS) OC-3, and Asynchronous Transfer Mode (ATM) media.
The Cisco uBR7246 features an I/O controller, up to two network interface port adapters, up to four cable modem cards, a network processing engine, and up to two removable power supplies. (The two power supplies in the Cisco uBR7246 provide load-sharing and redundancy capabilities.) The Cisco uBR7246 provides two PCMCIA slots that allow for software upgrades through the use of Flash memory cards.
Based on the Cisco uBR7246, the Cisco uBR7223 features an I/O controller, one network interface port adapter, up to two cable modem cards, a network processing engine, and a removable power supply. (The Cisco uBR7223 does not feature load-sharing and redundant power supply capability like the Cisco uBR7246.) The Cisco uBR7223 provides two PCMCIA slots that allow for software upgrades through the use of Flash memory cards.
The Cisco uBR7223 is a cost-effective, scalable interface between subscriber cable modems and the backbone data network, and is designed specifically for small- to medium-sized network installations.
These release notes describe the Cisco uBR7200 universal broadband series routers for Cisco IOS Release 12.0(6)SC. Release 12.0 SC is an early deployment (ED) release based on Release 12.0(5)T that contains fixes to software caveats. Other early deployment releases of the Cisco uBR7200 series routers are shown in Table 1.
| ED Release | Additional Software Features1 | Additional Hardware Features | Availability |
|---|---|---|---|
Release 11.3(11)NA | None | None | Now |
Release 12.0(4)XI2 |
|
| Now |
Release 12.0(5)T1 |
|
| Now |
Release 12.0(6)SC | None |
| Now |
| 1Only major features are listed. See the Release Notes for each particular release for a comprehensive feature list. |
This section describes the system requirements for Release 12.0 SC:
Table 2 displays the memory requirements of the Cisco IOS feature sets for the Cisco uBR7200 series universal broadband routers for Cisco IOS Release 12.0(6)SC. Cisco uBR7200 series universal broadband routers are available with a 16- or 20-MB Type II PCMCIA Flash memory card.
| Feature Set | Image Name | Required Flash Memory | Required DRAM Memory | Runs From | Feature History |
|---|---|---|---|---|---|
DOCSIS Two-Way | ubr7200-p-mz | 16 MB Flash | 64 MB DRAM | RAM | Added in Release 11.3(1)T and 12.0(1)T |
DOCSIS Two-Way with Baseline Privacy | ubr7200-klp-mz | 16 MB Flash | 64 MB DRAM | RAM | Added in Release 12.0(4)XI and 12.0(5)T |
The image subset legend for Table 2 is as follows:
This section clarifies the operation of certain features in the Cisco uBR7200 series universal broadband routers:
Cisco IOS Release 12.0(6)SC supports the following Cisco uBR7200 series universal broadband routers:
Cisco IOS Release 12.0(6)SC also supports the following currently available cable modem cards:
Table 3 lists and describes the port adapters supported by Cisco uBR7200 series routers in Cisco IOS Release 12.0(6)SC.
| Product Number1 | Description | Platforms Supported | In2 |
|---|---|---|---|
| ATM | |||
1-port ATM OC-3c/STM-1 single-mode intermediate reach port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
1-port ATM OC-3c/STM-1 multimode port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
5-port ATM CES3 (4 E1 120-ohm CBR4 ports and 1 OC-3 ATM single-mode port) port adapter | Cisco uBR7246 only | 12.0(3)T and later 12.0 T releases | |
5-port ATM CES3 (4 E1 120-ohm CBR4 ports and 1 E3 ATM port) port adapter | Cisco uBR7246 only | 12.0(3)T and later 12.0 T releases | |
5-port ATM CES3 (4 T1 CBR4 ports and 1 OC-3 ATM single-mode port) port adapter | Cisco uBR7246 only | 12.0(3)T and later 12.0 T releases | |
5-port ATM CES3 (4 T1 CBR4 ports and 1 T3 ATM port) port adapter | Cisco uBR7246 only | 12.0(3)T and later 12.0 T releases | |
1-port E3 ATM, PCI-based port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1-port T3 ATM, PCI-based port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1-port OC-3c/STM-1 multimode port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1-port OC-3c/STM-1 single-mode, intermediate reach port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1-port OC-3c/STM-1 single-mode, long reach port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
| Ethernet | |||
4-port Ethernet 10BaseT port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
8-port Ethernet 10BaseT port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
1-port 100BaseTX Fast Ethernet port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
1-port 100BaseFX Fast Ethernet port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
2-port 100BaseTX Fast Ethernet port adapter with Inter-Switch Link (ISL) support | Cisco uBR7200 series routers | 12.0(5)T and later 12.0 T releases | |
2-port 100BaseFX Fast Ethernet port adapter with Inter-Switch Link (ISL) support | Cisco uBR7200 series routers | 12.0(5)T and later 12.0 T releases | |
12-port 10BaseT and 2-port 10/100BaseTX port adapter | Cisco uBR7246 only | 12.0(5)T and later 12.0 T releases | |
| High-Speed Serial Interfaces (HSSI) | |||
1-port HSSI port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
2-port HSSI port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
| Packet-Over-SONET (POS) | |||
1-port POS OC-3 (STM-3c,STM-1/SDH) single-mode, long reach port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1-port POS OC3 (STM-3c,STM-1/SDH) single-mode, intermediate reach port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1-port POS OC3 (STM-3c,STM-1/SDH) multimode port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
| Serial | |||
4-port synchronous serial port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
8-port EIA/TIA-232 synchronous serial port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
8-port V.35 synchronous serial port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
8-port X.21 synchronous serial port adapter | Cisco uBR7200 series routers | 11.3(8)NA and later 11.3 NA releases | |
4-port unbalanced (75-ohm) E1-G.703/G.704 synchronous serial port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
4-port balanced (120-ohm) E1-G.703/G.704 synchronous serial port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1-port E3 serial port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1-port T3 serial port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
2-port E3 serial port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
2-port T3 serial port adapter | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1 multichannel E3, medium-speed serial interface | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1 multichannel T3 interface with BNC connectors | Cisco uBR7200 series routers | 12.0(3)T and later 12.0 T releases | |
1 multichannel DS1/PRI with 4 T1 interfaces (RJ-48C connectors) | Cisco uBR7200 series routers | 12.0(5)T and later 12.0 T releases | |
1 multichannel DS1/PRI with 8 T1 interfaces (RJ-48C connectors) | Cisco uBR7200 series routers | 12.0(5)T and later 12.0 T releases | |
1 multichannel DS1/PRI with DS1 DSU functionality and DS0 channel support | Cisco uBR7200 series routers | 12.0(5)T and later 12.0 T releases | |
1 multichannel E1/PRI with 8 E1 interfaces (RJ-48C connectors) | Cisco uBR7200 series routers | 12.0(5)T and later 12.0 T releases | |
| 1Refer to the Documentation CD-ROM or http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com for the most current list of supported port adapters. 2The number in the "In" column indicates the Cisco IOS release when the interface was first introduced. 3CES = circuit emulation services. 4CBR = constant bit rate. |
To determine the version of Cisco IOS software running on the Cisco uBR7200 series universal broadband router, log in to the router and enter the show version EXEC command:
router> show version Cisco Internetwork Operating System Software IOS (tm) ubr7200 Software (ubr7200-p-mz), Version 12.0(6)SC, RELEASE SOFTWARE
The output includes additional information such as processor revision numbers, memory amounts, and partition information.
For information on upgrading to a new software release, see the Cisco IOS Software Release 12.0(5)S Ordering Procedures product bulletin located on CCO at:
Service & Support: Product Bulletins: Software
Under Cisco IOS 12.0, click Cisco IOS Software Release 12.0(5)S Ordering Procedures (#935: 6/99). This document can also be found on CCO at http://www.cisco.com/warp/public/cc/cisco/mkt/ios/rel/120/prodlit/935_pb.htm. (You must have an account on CCO to access this URL.)
Cisco IOS software is packaged in software images consisting of feature sets---depending on the platform. Each feature set contains a specific set of Cisco IOS features.
 | Caution Cisco IOS images with strong encryption (including, but not limited to, 56-bit data encryption feature sets) are subject to United States government export controls and limited distribution. Images to be installed outside the United States require an export license. Customer orders may be denied or subject to delay because of United States government regulations, which can change without advance notice. Contact your sales representative or distributor for more information, or send an e-mail to export@cisco.com. |
Table 4 lists the features and feature sets supported by the Cisco uBR7200 series in Cisco IOS Release 12.0 SC and uses the following conventions:
| Feature | Feature Set | ||
|---|---|---|---|
| In1 | DOCSIS Two-Way | DOCSIS Two-Way, Baseline Privacy | |
| Internet | |||
| (3) | Yes | Yes |
| IP Routing | |||
| (3) | Yes | Yes |
| (4) | Yes | Yes |
| (3) | Yes | Yes |
| (4)XI1 | Yes | Yes |
| Management | |||
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| (5)NA | Yes | Yes |
| (3) | Yes | Yes |
| Spectrum Management Enhancements | |||
| (3) | Yes | Yes |
| Multimedia | |||
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| Quality of Service | |||
| (5)NA | Yes | Yes |
| (9)NA1 | Yes | Yes |
| (9)NA1 | Yes | Yes |
| (5)NA | Yes | Yes |
| (5)NA | Yes | Yes |
| (9)NA1 | Yes | Yes |
| (3) | Yes | Yes |
| (4)XI1 | Yes | Yes |
| Security | |||
| (3) | Yes | Yes |
| (5)NA | No | No |
| (5)NA | No | Yes |
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| (8)NA | Yes | Yes |
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| Switching | |||
| (3) | Yes | Yes |
| WAN Optimization | |||
| (3) | Yes | Yes |
| WAN Services | |||
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| (3) | Yes | Yes |
| (3) | Yes | Yes |
|
| Yes | Yes |
| (3) | Yes | Yes |
The following sections list the new hardware and software features supported by the Cisco uBR7200 series routers for Cisco IOS Release 12.0(6)SC. For a complete list of hardware and software features, listed by the release in which they first appeared, see Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.0 T.
The following new hardware features are supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(6)SC.
The software for the MC12C and MC14C cable modem cards is a driver running on the Cisco uBR7200 series universal broadband routers. Using a Protocol Control Information (PCI) interface, the universal broadband router line card software interacts with the cable modem card. Data is passed back and forth, as direct memory access (DMA) transfers, from the Cisco uBR7200's memory to the cable modem card.
Additionally, the MC12C and MC14C cable modem cards support universal broadband router line card management and control with the modem card Management Information Bases (MIBs), Media Access Control (MAC) control software and logical link management software based on DOCSIS standards, and minimized security.
For more information, refer to the Cisco uBR7200 Series Cable Modem Card Installation and Configuration publication.
There are no new hardware or software features supported by the Cisco uBR7200 series in Cisco IOS Release 12.0(6)SC.
The following new hardware features are supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(5)T.
The software for the MC16C cable modem card is a driver running on the Cisco uBR7200 series universal broadband routers. Using a Protocol Control Information (PCI) interface, the universal broadband router line card software interacts with the MC16C cable modem card. Data is passed back and forth, as Direct Memory Access (DMA) transfers, from the Cisco uBR7200's memory to the MC16C cable modem card.
Additionally, the MC16C cable modem card supports line card management and control with the MC16C MIB, Media Access Control (MAC) control software and logical link management software based on DOCSIS standards, and minimized security.
For more information, refer to the Cisco uBR7200 Series Cable Modem Card Installation and Configuration and Update to the Cisco uBR7200 Series Cable Modem Card Installation and Configuration for the MC16C Cards publications.
The multichannel DS1/PRI port adapter (PA-MC-4T1 and PA-MC-8T1 versions) is a single-wide module that integrates channel service unit (CSU) functionality, data service unit (DSU) functionality, and DS0 channel support into Cisco uBR7200 series routers. The PA-8DSX-1 version integrates DS1 data service unit (DSU) functionality and DS0 channel support into the Cisco uBR7200 series routers.
The multichannel DS1/PRI port adapter provides four or eight independent T1 (100-ohm) connections via RJ-48C connectors. Each multichannel DS1/PRI port adapter can provide up to 128 separate full-duplex HDLC DS0, fractional, or full T1 channels.
The multichannel E1/PRI port adapter (PA-MC-8E1/120) is a single-wide module that integrates DSU functionality and E1 channel support into Cisco uBR7200 series routers. The multichannel E1/PRI port adapter provides eight independent E1 (120-ohm) connections via RJ-48C connectors. Each multichannel E1/PRI port adapter can provide up to 128 separate full-duplex HDLC channelized E1, fractional E1, full E1, or unframed E1 interfaces.
The following new software features are supported by the Cisco uBR7200 series universal broadband routers in Cisco IOS Release 12.0(5)T.
This feature provides support for a basic wiretap facility for VoIP calls, as required by the United States Federal Communications Assistance for Law Enforcement Act (CALEA). The wiretap facility is based on the MAC address of the cable modem, so it can be used for either data or digitized voice connections.
The feature is controlled by the new interface command, cable intercept, which requires a MAC address, an IP address, and a UDP port number as its parameters. When activated, the Cisco uBR7200 series universal broadband router examines each packet for the desired MAC address; when a matching MAC address is found (for either the origination or destination endpoint), a copy of the packet is encapsulated into a UDP packet, which is then sent to the specified server at the given IP address and port.
Cisco uBR7200 series universal broadband routers support the Cisco IOS firewall feature, which is available in selected Cisco IOS Release 12.0(5)T and higher images. This feature set includes Network Address Translation (NAT) and is designed to prevent unauthorized, external access to your internal network, blocking attacks on your network while still allowing authorized users to access network resources. This feature is described in detail in the Cisco IOS feature set feature module, available on the Documentation CD-ROM and CCO.
This feature allows Cisco uBR7200 series universal broadband routers to change the downstream frequency for any or all cable modems, overriding the DOCSIS configuration file settings.
The Cisco uBR7200 series universal broadband routers contain the following additional or changed show commands:
The Automated Double Authentication feature enhances the existing double authentication feature. Previously, with the existing double authentication feature, a second level of user authentication was achieved when the user telnets to the network access server or router and enters a username and password. Now, with automated double authentication, the user does not have to use Telnet but instead responds to a dialog box that requests a username and password or PIN.
For each modulation/burst profile configuration, Cisco uBR7200 series universal broadband routers will support burst profile number, burst profile interval usage code, burst type, preamble length and unique word length, differential encoding enable/disable, forward error correction (FEC) correctable bytes value, FEC code word length, scrambler seed value, maximum burst size, guard time size, last code word shortened/lengthened, and scrambler enable/disable.
As an enhancement to baseline privacy, Cisco uBR7200 series universal broadband routers can be configured for cable modem and multicast authentication using the Remote Authentication Dial-In User Service (RADIUS) protocol, an access server authentication, authorization, and accounting protocol originally developed by Livingston, Inc. This release also introduces support for additional vendor-proprietary RADIUS attributes.
When a cable modem comes online or when an access request is sent through a multicast data stream, the Cisco uBR7200 series universal broadband routers send relevant information to RADIUS servers for cable modem/host authentication. This feature can be configured on a per-interface basis.
An Internet Engineering Task Force (IETF) draft standard, RFC 2138, defines the RADIUS protocol. RFC 2139 defines the corresponding RADIUS accounting protocol. Additional RFC drafts define vendor-proprietary attributes and MIBs that can be used with an SNMP manager.
This feature---also known as the Customer Premises Equipment (CPE) Limitation---allows Cisco uBR7200 series universal broadband routers to report and limit the number of CPEs that can use the cable modem to access the cable network.
This feature---also known as Cable Modem and Host Subnet Addressing---allows the Cisco uBR7200 series universal broadband router to set the GIADDR field of DHCPDISCOVER packets with a Relay IP Address to help automate the provisioning of cable modems on systems that use multiple IP subnets. The cable dhcp-giaddr [policy | primary] command enables this feature on a per-interface basis.
The Cisco uBR7200 series universal broadband routers support quality of service (QoS) as defined by the DOCSIS 1.0 specification. Service class profiles can be configured through the command-line interface to support the QoS profile number, traffic priority, maximum upstream bandwidth, guaranteed upstream bandwidth, maximum downstream bandwidth, maximum transmit burst length, baseline privacy enable/disable, and type of service (ToS) overwrite byte.
QoS Profile Enforcement allows CMTS operators to control the QoS to eliminate any interference from improper local-rate limiting implemented on the cable modem. The CMTS provisions a registering cable modem with a default DOCSIS 1.0 service class assigned by the operator, overriding any service class that previously existed on the modem. This service class has no upstream or downstream rate limits, so that the CMTS can do traffic shaping based on the QoS profile enforced by the operator.
As part of this support, Cisco uBR7200 series universal broadband routers support multiple service classes per cable modem by providing multiple QoS service identifiers (SIDs). This allows the Cisco uBR7200 series cable modem termination system (CMTS) to dynamically allocate and delete service flows for voice and fax transmissions.
The following commands are available on Cisco uBR7200 series universal broadband routers to update the QoS table:
This feature allows all cable modems in an HFC network to identify themselves via unique downstream channel IDs instead of their downstream frequencies.
Cisco uBR7200 series routers support downstream data rate shaping on a per modem basis. The ToS bits in the IP packet header can be set to specify that packet's class of service, allowing packets for certain traffic flows (such as VoIP) to be given precedence over packets for other flows (such as data).
Downstream rate shaping with ToS bits allows you to configure multiple data rates for a given modem. Also, by specifying a maximum data rate for a particular ToS, you can override the common maximum downstream data rate. Packets that contain ToS bytes that have not been configured for downstream data rates continue to use the common data rate limits.
Prior releases set the ToS bits to zero; however, with the advent of virtual private network (VPN) and QoS applications, it is desirable to copy the ToS bits when the router encapsulates the packets using generic routing encapsulation (GRE). Thus, intermediate routers between tunnel endpoints can also take advantage of QoS features such as weighted fair queuing (WFQ) and weighted random early detection (WRED).
Baseline privacy extensions permit the encryption of data transferred between the cable modem and the Cisco uBR7200 universal broadband router. The key management protocol defined by baseline privacy allows Cisco uBR7200 series universal broadband routers to provide two types of keys to cable modems. The Key Exchange Key (KEK) decrypts the Traffic Exchange Keys (TEK). The TEK is the key used to encrypt and decrypt data packets.
Extensive command-line interface enhancements include user configuration using the command-line interface, SNMP, and HTTP. All methods will provide essentially the same set of configuration objects.
Cisco uBR7200 series universal broadband routers are now able to respond to RFC 868 time-of-day (TOD) queries from cable modems during the registration process.
Cisco uBR7200 series routers support the Inter-Switch Link (ISL) feature, a Cisco protocol for interconnecting multiple routers and switches. The ISL protocol maintains Virtual Local Area Network (VLAN) information as traffic passes between routers and switches.
The Management Information Base (MIB) support in the Cisco uBR7200 series universal broadband routers provides much of the same ability to configure the router as using CLI commands at the router's console port. Additionally, the Radio Frequency (RF) Interface MIB has changed to improve the object support for traps and to add the following QoS and service class support:
The Parse Bookmarks feature quickly processes consecutive similar commands, such as access lists and prefix lists, up to five times faster than usual. This feature reduces boot and load time for large configurations with many similar consecutive commands. This feature is an enhancement to the parsing algorithm, so no configuration changes are needed to take advantage of it.
This feature---also known as Per-Modem and Per-Host Access Lists---allows Cisco uBR7200 series universal broadband routers to filter incoming packets from individual hosts or cable modems based on the source MAC or IP address. This allows access lists to be specified on a per-interface or a per-direction basis.
The Service Assurance (SA) Agent is both an enhancement to and a new name for the Response Time Reporter (RTR) feature that was introduced in Cisco IOS Release 11.2. This feature allows you to monitor network performance by measuring key Service Level Agreement metrics such as response time, network resources, availability, jitter, connect time, packet loss, and application performance.
With Cisco IOS Release 12.0(5)T, the SA Agent provides new capabilities that enable you to:
The following spectrum management enhancements are available in the Cisco uBR7200 series universal broadband routers:
This feature prevents the spoofing of IP addresses by verifying the IP address against the cable modem's MAC address. The cable source-verify [ dhcp ] cable interface command specifies that DHCP lease query requests are sent to verify any unknown source IP address found in upstream data packets. This feature requires a DHCP server which supports the new LEASEQUERY message type.
This feature was first introduced in Cisco IOS Release 11.3(9)NA1. The Cisco uBR7200 series universal broadband router supports buffering both upstream and downstream grants to cable modems that are exceeding their allocated bandwidth. This strategy helps to avoid the TCP timeouts and the retransmission of the associated packets which would further degrade overall throughput.
Previously, whenever a cable modem was found to be exceeding its configured peak upstream or downstream rate, the Cisco uBR7200 series universal broadband router would simply drop the bandwidth requests from that cable modem until it could be allowed to send more data.
The cable downstream port number rate-limit token-bucket shaping and cable upstream port number rate-limit token-bucket shaping commands configure the Cisco uBR7200 series universal broadband router to perform rate shaping by buffering the grants for rate-exceeded modems.
The following new hardware feature is supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(3)T.
The MC16B ca ble modem card is available for the Cisco uBR7200 series universal broadband router. The software for the MC16B modem card is a driver running on the router and interacts with the card using a PCI interface. Data is passed back and forth, using direct memory access (DMA) transfers, from the Cisco uBR7200 memory to the MC16B card.
Additionally, the MC16B card supports universal broadband router line card management and control with the MC16 MIB, MAC control software and logical link management software based on MCNS standards, and minimized security.
For more information, refer to the Update to the Cisco uBR7200 Series Cable Modem Card Installation and Configuration for the MC16B EFT Card publication.
The following new software features are supported by the Cisco uBR7200 series universal broadband routers in Cisco IOS Release 12.0(3)T.
The Cisco uBR7200 series universal broadband router can use Committed Access Rate (CAR) policies to control the traffic exceeding its allocated bandwidth. This feature uses token bucket filters to measure the traffic load and limit sources, at either the network ingress or egress, to the allocated bandwidth.
Cisco IOS Release 12.0(3)T implements the latest revision (version 3) of the S imple Network Management Protocol (SNMPv3), which builds on top of the previous SNMPv1 and SNMPv2 versions of the protocol to provide a much more secure network environment. SNMPv3 also improves the remote configuration of the SNMP entities, which makes the remote administration of SNMP agents, such as cable modems, a much simpler task.
SNMPv3 uses the concept of an engine to link specific applications and security features with a group of SNMP entities. Each SNMP entity has an EngineID identifier, and SNMP communication is possible only when an SNMP entity knows the EngineID identity of its peer SNMP device.
SNMPv3 provides for synchronization between SNMP entities so that any management requests that appear outside of the synchronization windows are rejected. Security is also enhanced by the use of a user-based security model (USM) that provides message encryption to protect against the following types of attacks on the network:
The SNMPv3 protocol is defined by the Request for Comment (RFC) specifications RFC 2570, RFC 2571, RFC 2572, RFC 2573, RFC 2574, and RFC 2575.
The Cisco uBR7200 series universal broadband router offers an integrated Dynamic Host Configuration Protocol (DHCP) server to simplify provisioning of cable modems.
IP policy routing now works with Cisco Express Forwarding (CEF), Distributed CEF (DCEF), NetFlow, and NetFlow with flow acceleration. IP policy routing was formerly supported only in fast-switching and process-switching. Now that policy routing is integrated into CEF, you can deploy policy routing on wide-scale and high-speed interfaces.
The addition of the CISCO-PROCESS-MIB and changes to the CISCO-MEMORY-POOL-MIB will allow you to retrieve more CPU and memory statistics.
The Resource Reservation Protocol (RSVP) works together with Weighted Fair Queuing (WFQ) to give priority to packets that fall into a reservation within RSVP so that the packets enter the output queue and cable network before other packets.
Support for both version 1 and version 2 of the Web Cache Control Protocol (WCCP and WCCPv2). See the Cisco Cache Engine User Guide , Version 2.0.0 on CCO and the Documentation CD-ROM for more information about WCCP and WCCPv2. (Previous releases of Cisco IOS Release 12.0 supported only version 2 (WCCPv2) and previous releases of Cisco IOS Release 11.3NA supported only version 1 (WCCP) of the protocol.)
The Weighted Random Early Detection (WRED) feature enhances the Random Early Detection (RED) algorithm of handling congestion conditions by allowing the administrator to specify preferential traffic handling for higher priority traffic (as defined by the IP precedence bits). Administrators can define the minimum and maximum queue depth thresholds and drop probabilities for each class of service.
The Weighted Fair Queuing (WFQ) feature performs priority output queuing and custom queuing to grant resources to important sessions when the network bandwidth is saturated; for example, priority could be given to digitized voice traffic to minimize delays. WFQ provides expeditious handling of high priority traffic while fairly sharing the remaining bandwidth between the lower priority traffic.
Cisco IOS Release 12.0(6)SC for the Cisco uBR7200 series universal broadband routers contains the following limitations and restrictions. Unless otherwise indicated, these limitations and restrictions apply to all previous software releases as well.
The Signal-Noise Ratio (SNR) output in the cable show controller command is supported only on the MC11C, MC12C, MC14C, and MC16C cable modem cards. Although this command might display SNR statistics for some versions of the MC16B cable modem card, that output should be disregarded.
The following sections contain important notes about Cisco IOS Release 12.0(6)SC that apply to Cisco uBR7200 series universal broadband routers.
Be aware that when configuring a routing protocol on a Cisco uBR7200 series cable interface, the Cisco IOS software must reset the interface to enable the change. This in turn causes all cable modems on that particular downstream to reinitialize, potentially interfering with data transmission on that downstream. Therefore you should use the interface configuration commands, such as router rip, on a cable interface only when a minimum of subscribers would be affected.
Cisco uBR7200 series routers running Cisco IOS Release 12.0 use the global configuration command [no] ip dhcp relay information option to insert DHCP relay-agent option fields. (Previously, routers running Cisco IOS Release 11.3NA used the cable relay-agent-option command, which is no longer supported, for this purpose.)
Because of changes in handling the MAC address between Cisco IOS Software Releases 11.x and 12.0, you must clear the Address Resolution Protocol (ARP) tables after upgrading from Cisco IOS Software Release 11.x to Release 12.0(6)SC. Failure to do this could cause cable modem registration to fail during time of day (ToD) provisioning. Clearing the ARP tables must be done on all routers and ToD servers connected to the Cisco uBR7200 series cable router.
When the Cisco uBR7223 or Cisco uBR7246 router first powers on, messages similar to the following can appear immediately after the boot image loads and initializes:
%PA-2-UNDEFPA: Undefined Port Adapter type 248 in bay 3 %PA-2-UNDEFPA: Undefined Port Adapter type 248 in bay 4 %PA-2-UNDEFPA: Undefined Port Adapter type 243 in bay 5 %PA-3-DEACTIVATED: port adapter in bay [3] powered off. %PA-3-DEACTIVATED: port adapter in bay [4] powered off. %PA-3-DEACTIVATED: port adapter in bay [5] powered off. %SYS-6-BOOT_MESSAGES: Messages above this line are from the boot loader.
The exact number of messages depends on the number of port adapters and cable modem cards installed in the CiscouBR7200 series chassis. The messages about undefined port adapters can be safely ignored because the boot loader is not expected to recognize the cable modem cards. Instead, the cable modem cards are activated by the Cisco IOS software image, which the boot loader loads immediately after displaying the above messages.
Certain Cisco MIBs are scheduled to be replaced in a future release. The functionality of the OLD-CISCO-* MIBS has already been incorporated into more scalable, standardized MIBs, without affecting existing Cisco IOS products or NMS applications. You should update your network management applications and scripts by changing the deprecated MIBs to the replacement MIBs as shown in Table 5:
| Deprecated MIB | Replacement |
|---|---|
OLD-CISCO-APPLETALK-MIB | RFC1243-MIB |
OLD-CISCO-CHASSIS-MIB | ENTITY-MIB |
OLD-CISCO-CPUK-MIB | In Development |
OLD-CISCO-DECNET-MIB |
|
OLD-CISCO-ENV-MIB | CISCO-ENVMON-MIB |
OLD-CISCO-FLASH-MIB | CISCO-FLASH-MIB |
OLD-CISCO-INTERFACES-MIB | IF-MIB CISCO-QUEUE-MIB |
OLD-CISCO-IP-MIB |
|
OLD-CISCO-MEMORY-MIB | CISCO-MEMORY-POOL-MIB |
OLD-CISCO-NOVELL-MIB | NOVELL-IPX-MIB |
OLD-CISCO-SYS-MIB | (Compilation of other OLD* MIBS) |
OLD-CISCO-SYSTEM-MIB | CISCO-CONFIG-COPY-MIB |
OLD-CISCO-TCP-MIB | CISCO-TCP-MIB |
OLD-CISCO-TS-MIB |
|
OLD-CISCO-VINES-MIB | CISCO-VINES-MIB |
OLD-CISCO-XNS-MIB |
|
This section lists the caveats that describe potentially unexpected behavior in Cisco IOS Release 12.0(6)SC. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious.
For information on additional caveats in Cisco IOS Release 12.0 T, see Caveats for Cisco IOS Release 12.0 T document.
All caveats in Release 12.0 are also in Release 12.0 T. For information on caveats in Cisco IOS Release 12.0, see Caveats for Cisco IOS Release 12.0 document.
This section describes possibly unexpected behavior by Release 12.0(6)SC. Unless otherwise noted, these caveats apply to all 12.0 releases up to and including 12.0(6)SC.
This section describes possibly unexpected behavior by Release 12.0(5)S. Unless otherwise noted, these caveats apply to all 12.0 releases up to and including 12.0(5)S. For additional caveats applicable to Cisco IOS Release 12.0(5)S, see the caveats sections for newer 12.0 releases. The caveats for newer releases precede this section.
All the caveats listed in this section are resolved in Release 12.0(6)SC.
The following sections describe the documentation available for the Cisco uBR7200 series universal broadband routers. These documents consist of hardware and software installation guides, Cisco IOS configuration and command references, system error messages, feature modules, and other documents.
Documentation is available as printed manuals or electronic documents, except for feature modules, which are available online on CCO and the Documentation CD-ROM.
Use these release notes with these documents:
The following documents are specific to Release 12.0 and are located on CCO and the Documentation CD-ROM:
These documents are available for the Cisco uBR7200 series universal broadband routers on CCO and the Documentation CD-ROM:
On CCO:
Service & Support: Documentation Home Page: Broadband/Cable Solutions: Cisco uBR7200 Series Universal Broadband Routers
On the Documentation CD-ROM:
Broadband/Cable Solutions: Cisco uBR7200 Series Universal Broadband Routers
Feature modules describe new features supported by Cisco IOS Release 12.0 T and are updates to the Cisco IOS documentation set. A feature module consists of a brief overview of the feature, benefits, configuration tasks, and a command reference. As updates, the feature modules are available online only. Feature module information is incorporated in the next printing of the Cisco IOS documentation set.
On CCO:
Service & Support: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation: New Features in Release 12.0 T
On the Documentation CD-ROM:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation: New Features in Release 12.0 T
The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS command references, and several other supporting documents, which are shipped with your order in electronic form on the Documentation CD-ROM---unless you specifically order the printed versions.
Each module in the Cisco IOS documentation set consists of two books: a configuration guide and a corresponding command reference. Chapters in a configuration guide describe protocols, configuration tasks, and Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference.
On CCO and the Documentation CD-ROM, two master hot-linked documents provide information for the Cisco IOS software documentation set: configuration guides and command references.
On CCO:
Service & Support: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides and Command References: Cisco IOS Interface Configuration Guide or Cisco IOS Interface Command Reference
On the Documentation CD-ROM:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides and Command References: Cisco IOS Interface Configuration Guide or Cisco IOS Interface Command Reference
Table 6 describes the contents of the Cisco IOS Release 12.0 software documentation set, which is available in electronic form, and also in printed form upon request.
On CCO:
Service & Support: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides and Command References
On the Documentation CD-ROM:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides and Command References
| Books | Chapter Topics |
|---|---|
| Configuration Fundamentals Overview |
| Transparent Bridging |
| Dial-In Port Setup |
| Interface Configuration Overview |
| IP Addressing |
| AppleTalk |
| Apollo Domain |
| AAA Security Services |
| Switching Paths for IP Networks |
| ATM |
| Voice over IP |
| Classification |
|
|
For service and support for a product purchased from a reseller, contact the reseller, who offers a wide variety of Cisco service and support programs described in "Service and Support" of Cisco Information Packet shipped with your product.
For service and support for a product purchased directly from Cisco, use CCO.
If you have a CCO login account, you can access the following URL, which contains links and helpful tips on configuring your Cisco products:
http://www.cisco.com/kobayashi/serv_tips.shtml
This URL is subject to change without notice. If it changes, point your web browser to CCO and click on this path: Products & Technologies: Products: Technical Tips.
The following sections are provided from the Technical Tips page:
Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Maintenance customers and partners can self-register on CCO to obtain additional information and services.
Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco's customers and business partners. CCO services include product information, product documentation, software updates, release notes, technical tips, the Bug Navigator, configuration notes, brochures, descriptions of service offerings, and download access to public and authorized files.
CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously: a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, figures, graphics, and video, as well as hyperlinks to related information.
You can reach CCO in the following ways:
For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.
Cisco documentation and additional literature are available in a CD-ROM package that ships with your product. The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly. Therefore, it might be more current than printed documentation. To order additional copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or as an annual subscription. You can also access Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.
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Posted: Mon Sep 27 10:50:14 PDT 1999
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