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Table of Contents

Release Notes for Cisco uBR7200 Series
for Cisco IOS Release 12.0(7)T

Release Notes for Cisco uBR7200 Series
for Cisco IOS Release 12.0(7)T

December 13, 1999

These release notes for the Cisco uBR7200 series universal broadband routers describe the enhancements provided in Cisco IOS Release 12.0(7)T, which is an early deployment release based on Cisco IOS Release 12.0 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(7)T, see the "Caveats for Release 12.0(7)T" section, the Caveats for Cisco IOS Release 12.0 document, and the Caveats for Cisco  IOS Release 12.0 T document. The caveats documents are updated for every maintenance release and are on Cisco Connection Online ( CCO) and the Documentation CD-ROM.

Use these release notes with Cross-Platform Release Notes for Cisco IOS Release 12.0 , located on CCO and the Documentation CD-ROM.

Contents

These release notes describe the following topics:

Introduction

The Cisco uBR7200 series universal broadband routers---the Cisco uBR7223, the Cisco uBR7246, and the Cisco uBR7246 VXR---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 and set-top boxes (STBs).

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, Gigabit Ethernet, serial, High-Speed Serial Interface (HSSI), Packet over SONET (POS) OC-3 and OC-12c, and Asynchronous Transfer Mode (ATM) media. Additional protocols and media may be added as they become available for the Cisco uBR7200 series routers.

Cisco uBR7246 VXR Universal Broadband Router

The Cisco uBR7246 features an I/O controller, up to two network interface port adapters, up to four cable modem cards, a high-performance network processing engine, and up to two removable power supplies, providing load-sharing and redundancy capabilities. The Cisco uBR7246 VXR provides two PCMCIA slots that allow for software upgrades through the use of Flash memory cards.

Note The Cisco uBR7246 VXR chassis does not support the MC11-FPGA cable modem card.

Cisco uBR7246 Universal Broadband Router

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, providing load-sharing and redundancy capabilities. The Cisco uBR7246 provides two PCMCIA slots that allow for software upgrades through the use of Flash memory cards.

Cisco uBR7223 Universal Broadband Router

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 and Cisco uBR7246 VXR.) 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 network installations.

Early Deployment Releases

These release notes describe the Cisco uBR7200 series universal broadband routers for Cisco IOS Release 12.0(7)T. Release 12.0 T is an early deployment (ED) release based on Release 12.0; early deployment releases contain fixes to software caveats as well as support for new Cisco hardware and software features. Table 1 shows recent early deployment releases of the Cisco uBR7200 series routers:


Table 1: Early Deployment Releases for the Cisco uBR7200 Series
ED Release Additional Software Features1 Additional Hardware Features Availability

Release 11.3(11)NA

None

None

Now

Release 12.0(4)XI2

  • Encrypted Baseline Privacy Key Exchange

  • Multiple ISDN Switch Types

  • Named Method Lists for AAA Authorization and Accounting, and Automated Double Authentication

  • Quality of Service Enhancements

  • RADIUS Authentication with Vendor-Proprietary Attributes

  • Spectrum Management Enhancements

  • Upstream Traffic Shaping

  • Telco Return

  • MC11-FPGA Cable Modem Card

  • MC16B Cable Modem Card

Now

Release 12.0(5)T1

  • Release 12.0(4)XI2 features

  • Downstream Rate Shaping with ToS Bits

  • Enhanced RADIUS support

  • Inter-Switch Link (ISL) Support for non-cable interfaces

  • Integrated ToD Server

  • Static Multiple SID Support

  • MC11C Cable Modem Card

  • MC16C Cable Modem Card

  • Multichannel DS1/PRI Port Adapter

  • Multichannel E1/PRI Port Adapter

Now

Release 12.0(6)SC

None (no Telco Return, RADIUS, Multiple SID, or DOCSIS QoS extensions support)

  • MC12C Cable Modem Card

  • MC14C Cable Modem Card

Now

Release 12.0(7)SC

None (no Telco Return, RADIUS, Multiple SID, or DOCSIS QoS extensions support)

  • OC-12c Dynamic Packet Transport Port Adapter

  • IEEE 802.3z Gigabit Ethernet Port Adapter

  • NPE-300 Network Processing Engine

  • uBR7246 VXR Chassis

Now

12/1999

1/2000

1/2000

Release 12.0(7)XR

  • Baseline Privacy Interface (BPI) MIB

  • Cable Interface Bundling

  • DOCSIS Quality of Service Enhancements

  • Enhanced Modem Status Display

  • Firewall Enhancements

  • Interface Command Enhancements

  • Redirect-Number Support for RADIUS and TACACS+ Servers

  • SubInterface Support for Virtual Private Networks

  • Upstream Address Verification Enhancement

  • R12.0(6)SC and R12.0(7)SC hardware features except that OC-12c DPT port adapters are not supported

  • WT2700 Wireless Technology Suite, which includes the Wireless Modem Card

  • MC16E Cable Modem Card

  • MC16S Cable Modem Card

  • 12/1999


  • 12/1999

  • 2/2000

  • 2/2000

Release 12.0(7)T2

  • Baseline Privacy MIB

  • Enhanced Modem Status Display

  • Firewall Enhancements

  • Interface Command Enhancements

  • Redirect-Number Support for RADIUS and TACACS+ Servers

  • Upstream Address Verification Enhancement

  • MC12C Cable Modem Card

  • MC14C Cable Modem Card

  • MC16E Cable Modem Card

  • IEEE 802.3z Gigabit Ethernet Port Adapter

  • NPE-300 Network Processing Engine

  • OC-12c Dynamic Packet Transport Port Adapter

  • Cisco uBR7246 VXR Chassis

  • Now

  • Now

  • 2/2000


  • 1/2000

  • Now

  • 1/2000

1Only major features are listed. See the Release Notes for each particular release for a comprehensive feature list.
2The 12.0 T releases do not automatically incorporate features from other early deployment releases, such as the SC and XR releases. Features in those other releases should not be considered part of Release 12.0(7)T unless specifically listed.

System Requirements

This section describes the system requirements for Release 12.0(7)T:

Memory Requirements

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(7)T. Cisco uBR7200 series universal broadband routers are available with a 16- or 20-MB Type II PCMCIA Flash memory card.


Table 2: Memory Requirements for the Cisco uBR7200 Series Universal Broadband Routers, Release 12.0(7)T Feature Sets
Feature Set Image Name Required
Flash
Memory 		Required
DRAM
Memory 		Runs
From 		Feature
History

DOCSIS Two-Way IP Plus with BPI

uBR7200-ik1s-mz

16 MB Flash

64 MB DRAM

RAM

Added in Release 12.0(4)XII and 12.0(5)T1

DOCSIS Two-Way IP Plus Telco-Return with BPI

uBR7200-ik1st-mz

16 MB Flash

64 MB DRAM

RAM

Added in Release 12.0(4)XII and 12.0(5)T1

DOCSIS Two-Way IP Plus

uBR7200-is-mz

16 MB Flash

64 MB DRAM

RAM

Added in Release 12.0(4)XII and 12.0(5)T1

DOCSIS Two-Way IP Plus Telco-Return

uBR7200-ist-mz

16 MB Flash

64 MB DRAM

RAM

Added in Release 12.0(4)XII and 12.0(5)T1

DOCSIS Two-Way with BPI

uBR7200-k1p-mz

16 MB Flash

64 MB DRAM

RAM

Added in Release 12.0(4)XII and 12.0(5)T1

DOCSIS Two-Way

uBR7200-p-mz

16 MB Flash

64 MB DRAM

RAM

Added in Release 12.0(4)XII and 12.0(5)T1

The image subset legend for Table 2 is as follows:

Note All Cisco IOS Release 12.0(7)T images require 64 MB of DRAM.

System Interoperability

This section clarifies the operation of certain features in the Cisco uBR7200 series universal broadband routers:

The H.323v2 protocol is integrated in Cisco gatekeeper/gateway products such as the Cisco 2500 series, 2600 series, and 3600 series routers, using Cisco IOS Release 12.0(5)T or higher interim images. The gatekeeper must be running Cisco IOS Release 12.0(5)T or higher in order to support registration of the full E.164 address for each cable modem port.
DOCSIS configuration files can contain multiple classes of service (CoS) to support voice. The first CoS is used for data (and voice if no other CoS is defined), and a second CoS can be defined to give higher priority for voice traffic. Lower-priority traffic can then be fragmented to avoid interfering with the timeslots allocated for voice traffic. Multiple SIDs are used to support the traffic flows that use different classes of service.
However, multiple classes of service might not guarantee a higher priority for voice calls when the Cisco uBR7200 series router supports a network containing both DOCSIS 1.0 and 1.1 cable modems. Because the DOCSIS 1.0 cable modems do not support the fragmentation of request messages, the voice and data traffic is mixed, and voice traffic is transmitted on a best-effort basis. This can cause some delay and jitter in the voice calls, resulting in poorer voice quality and lower throughput on the VoIP network.
However, the Cisco uBR7200 series router uses advanced flow scheduling algorithms in its MAC scheduler to address much of this problem, so that the maximum jitter is almost undetectable on upstream channels with 1.6 Mbps and greater bandwidth. In this case, the maximum jitter is approximately 5 milliseconds for an upstream channel using the QPSK symbol rate and only 1 millisecond when using 16-QAM or higher symbol rates. (These are worst-case scenarios that would require an unfragmented maximum-sized 1500-byte upstream packet appearing immediately before the assigned time slot for a voice grant, which is highly unlikely to occur in normal networking operations.)
Note If DOCSIS 1.0 and 1.1 cable modems must be mixed on upstream channels with less than 1.6 Mbps bandwidth, jitter can be minimized by configuring the end-user's CPE devices for an MTU of 512 bytes or less.

Hardware Supported

Cisco IOS Release 12.0(7)T supports the following Cisco uBR7200 series universal broadband routers:

Network Processing Engines

In addition to the currently supported network processing engines (NPE), Cisco IOS Release 12.0(7)T also supports the NPE-300 card, which has an R7000 microprocessor that operates at an internal clock speed of 262 MHz (supported only on the Cisco uBR7426 VXR).

Cable Modem Cards

Cisco IOS Release 12.0(7)T supports the following cable modem cards:

Note Installation and configuration of the cable modem cards is documented on CCO and the Documentation CDROM in the Broadband/Cable section on the Cisco uBR7200 Series Configuration Notes page.

Port Adapter Cards

Table 3 lists and describes the port adapters supported by Cisco uBR7200 series routers in Cisco IOS Release 12.0(7)T.

Note Not all Cisco uBR7200 series universal broadband routers support all port adapters. Also, some port adapters must be at certain revision levels to be used in the Cisco uBR7246 VXR router. See "Port Adapter Support for Cisco uBR7246 VXR" section for more details.


Table 3: Supported Interfaces on the Cisco uBR7200 Series Universal Broadband Routers
Product Number1 Description Platforms Supported In2
ATM

PA-A1-OC3SMI

1-port ATM OC-3c/STM-1 single-mode intermediate reach port adapter

Cisco uBR7223, uBR7246

11.3(1)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-A1-OC3MM

1-port ATM OC-3c/STM-1 multimode port adapter

Cisco uBR7223, uBR7246

11.3(1)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-A2-4E1XC-OC 3SM

5-port ATM CES3 (4 E1 120-ohm CBR4 ports and 1 OC-3 ATM single-mode port) port adapter

Cisco uBR7246

11.3(5)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-A2-4E1XC-E3ATM

5-port ATM CES3 (4 E1 120-ohm CBR4 ports and 1 E3 ATM port) port adapter

Cisco uBR7246

11.3(5)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-A2-4T1C-OC3SM

5-port ATM CES3 (4 T1 CBR4 ports and 1 OC-3 ATM single-mode port) port adapter

Cisco uBR7246

11.3(5)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-A2-4T1C-T3ATM

5-port ATM CES3 (4 T1 CBR4 ports and 1 T3 ATM port) port adapter

Cisco uBR7246

11.3(5)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-A3-E3

1-port E3 ATM, PCI5-based port adapter

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

PA-A3-T3

1-port T3 ATM, PCI-based port adapter

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

PA-A3-OC3MM

1-port OC-3c/STM-1 multimode port adapter

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

PA-A3-OC3SMI

1-port OC-3c/STM-1 single-mode, intermediate reach port adapter

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

PA-A3-OC3SML

1-port OC-3c/STM-1 single-mode, long reach port adapter

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

Ethernet

PA-4E

4-port Ethernet 10BaseT port adapter

Cisco uBR7200 series routers

11.3(1)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-8E

8-port Ethernet 10BaseT port adapter

Cisco uBR7200 series routers

11.3(1)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-FE-TX

1-port 100BaseTX Fast Ethernet port adapter

Cisco uBR7200 series routers

11.3(1)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-FE-FX

1-port 100BaseFX Fast Ethernet port adapter

Cisco uBR7200 series routers

11.3(1)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-2FEISL-TX

2-port 100BaseTX Fast Ethernet port adapter with token-ring Inter-Switch Link (ISL) support

Cisco uBR7200 series routers

12.0(5)T and later 12.0 T releases

PA-2FEISL-FX

2-port 100BaseFX Fast Ethernet port adapter with token-ring Inter-Switch Link (ISL) support

Cisco uBR7200 series routers

12.0(5)T and later 12.0 T releases

PA-12E/2FE

12-port 10BaseT and 2-port 10/100BaseTX port adapter

Cisco uBR7246

12.0(5)T and later 12.0 T releases

PA-GE

1-port IEEE 802.3z Gigabit Ethernet port adapter

Cisco uBR7246 VXR only

12.0(7)SC, 12.0(7)XR, 12.0(7)T, and later releases

High-Speed Serial Interfaces (HSSI)

PA-H

1-port HSSI port adapter

Cisco uBR7200 series routers

11.3(1)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-2H

2-port HSSI port adapter

Cisco uBR7200 series routers

12.0(3)T and later 12.0 T releases

Packet over SONET (POS)

PA-POS-OC3SML

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

PA-POS-OC3SMI

1-port POS OC-3 (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

PA-POS-OC3MM

1-port POS OC-3 (STM-3c,STM-1/SDH) multimode port adapter

Cisco uBR7200 series routers

12.0(3)T and later 12.0 T releases

Dynamic Packet Transport (DPT)

PA-SRP-OC12SML

2-port OC-12c (STM4c) single-mode fiber, long reach DPT port adapter

Cisco uBR7246, uBR7246 VXR

12.0(7)SC and later 12.0 SC releases
12.0(7)T and later 12.0 T releases

PA -SRP-OC12SMI

2-port OC-12c (STM4c) single-mode fiber, intermediate reach DPT port adapter

Cisco uBR7246, uBR7246 VXR

12.0(7)SC and later 12.0 SC releases
12.0(7)T and later 12.0 T releases

PA -SRP-OC12MM

2-port OC-12c (STM4c) multimode fiber DPT port adapter

Cisco uBR7246, uBR7246 VXR

12.0(7)SC and later 12.0 SC releases
12.0(7)T and later 12.0 T releases

Serial

PA-4T+

4-port synchronous serial port adapter

Cisco uBR7223, uBR7246

11.3(4)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-8T-232

8-port EIA/TIA-232 synchronous serial port adapter

Cisco uBR7223, uBR7246

11.3(4)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-8T-V35

8-port V.35 synchronous serial port adapter

Cisco uBR7223, uBR7246

11.3(4)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-8T-X21

8-port X.21 synchronous serial port adapter

Cisco uBR7223, uBR7246

11.3(4)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-4E1G/75

4-port unbalanced (75-ohm) E1-G.703/G.704 synchronous serial port adapter

Cisco uBR7223, uBR7246

11.3(4)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-4E1G/120

4-port balanced (120-ohm) E1-G.703/G.704 synchronous serial port adapter

Cisco uBR7223, uBR7246

11.3(4)NA and later 11.3 NA releases
12.0(3)T and later 12.0 T releases

PA-E3

1-port E3 serial port adapter

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

PA-T3

1-port T3 serial port adapter

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

PA-2E3

2-port E3 serial port adapter

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

PA-2T3

2-port T3 serial port adapter

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

PA-MC-E3

1 multichannel E3, medium-speed serial interface

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

PA-MC-T3

1 multichannel T3 interface with BNC connectors

Cisco uBR7223, uBR7246

12.0(3)T and later 12.0 T releases

PA-MC-4T1

1 multichannel DS1/PRI with 4 T1 interfaces (RJ-48C connectors)

Cisco uBR7223, uBR7246

12.0(5)T and later 12.0 T releases

PA-MC-8T1

1 multichannel DS1/PRI with 8 T1 interfaces (RJ-48C connectors)

Cisco uBR7223, uBR7246

12.0(5)T and later 12.0 T releases

PA-MC-8E1/120

1 multichannel E1/PRI with 8 E1 interfaces (RJ-48C connectors)

Cisco uBR7223, uBR7246

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.
5PCI = Peripheral Component Interconnect.

Determining Your Software Release

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(7)T, RELEASE SOFTWARE

Upgrading to a New Software Release

Cisco IOS Software Release 12.0(7)T is derived from the 12.0 T release train. For information on upgrading to a new software release, see the Cisco IOS Software Release 12.0 T Upgrade product bulletin located on CCO at:

Service & Support: Software Center: Cisco IOS Software: Product Bulletins: Software

Under Cisco IOS 12.0, click Cisco IOS Software Release 12.0T (#819:0999). This document can also be found on CCO at http://www.cisco.com/warp/public/cc/cisco/mkt/ios/rel/120/prodlit/819_pp.htm. (You must have an account on CCO to access this URL.)

Note Because of changes in handling the MAC address between Cisco IOS Releases 11 and 12.0, you must clear the Address Resolution Protocol (ARP) table on the routers connected to the Cisco uBR7200 series cable router after upgrading from Cisco IOS Release 11 to Release 12.0(7)T. See "Upgrading to a New Software Release" section for more information.

Feature Set Tables

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, 168-bit [3DES] data encryption feature sets) are subject to United States government export controls and have limited distribution. Strong encryption images to be installed outside the United States may require an export license. Customer orders may be denied or subject to delay due to United States government regulations. When applicable, the purchaser or user must obtain local import and use authorizations for all encryption strengths. 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(7)T and uses the following conventions:

Note This feature set table only contains a selected list of features. This table is not cumulative nor does it list all the features in each image. Features that are not listed are in all images.


Table 4: Feature List by Feature Sets for Cisco uBR7200 Series Universal Broadband Routers
Feature Feature Set
In1 DOCSIS Two-way DOCSIS Two-way with Baseline Privacy DOCSIS Two-way, IP Plus DOCSIS Two-way, IP Plus, Telco Return DOCSIS Two-way, IP Plus with BPI DOCSIS Two-way, IP Plus, Telco Return with BPI
Internet
Dynamic Host Configuration Protocol (DHCP) Server

(4)XI2

(5)T1

Yes

Yes

Yes

Yes

Yes

Yes

DRP Server Agent

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Telco-Return

(4)XI2
(5)T1

No

No

No

Yes

No

Yes

Time of Day (ToD) Server

(4)XI2

(5)T1

Yes

Yes

Yes

Yes

Yes

Yes

IP Routing
Easy IP (Phase 1)

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Hot Standby Router Protocol (HSRP) over ISL in Virtual LAN Configurations

(3)

No

No

Yes

Yes

Yes

Yes

IP Type of Service and Precedence for GRE Tunnels

(4)

Yes

Yes

Yes

Yes

Yes

Yes

IP Enhanced IGRP Route Authentication

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Per-Modem Filters

(4)XI2
(5)T1

Yes

Yes

Yes

Yes

Yes

Yes

Management
Cisco Call History MIB Command Line Interface

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Cisco IOS Internationalization

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Entity MIB, Phase 1

(3)

Yes

Yes

Yes

Yes

Yes

Yes

MIB Enhancements

(5)NA

Yes

Yes

Yes

Yes

Yes

Yes

SNMPv2C and SNMPv3

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Multimedia

IP Multicast Load Splitting across Equal-Cost Paths

(3)

Yes

Yes

Yes

Yes

Yes

Yes

IP Multicast over ATM Point-to-Multipoint Virtual Circuits

(3)

Yes

Yes

Yes

Yes

Yes

Yes

IP Multicast over Token Ring LANs

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Stub IP Multicast Routing

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Quality of Service
Downstream QoS Handling

(5)NA

Yes

Yes

Yes

Yes

Yes

Yes

Downstream Traffic Shaping

(9)NA1
(4)XI2
(5)T1

Yes

Yes

Yes

Yes

Yes

Yes

Upstream Traffic Shaping

(9)NA1
(4)XI2
(5)T1

Yes

Yes

Yes

Yes

Yes

Yes

Improved Upstream QoS

(5)NA

Yes

Yes

Yes

Yes

Yes

Yes

QoS Configuration

(5)NA

Yes

Yes

Yes

Yes

Yes

Yes

QoS Profile Enforcement

(9)NA1

Yes

Yes

Yes

Yes

Yes

Yes

Read/Create Implementation of QoS

(5)NA

No

Yes

Yes

Yes

Yes

Yes

RTP Header Compression

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Multiple SID Support (static only)

(4)XI2
(5)T1

Yes

Yes

Yes

Yes

Yes

Yes

Security
Automated Double Authentication

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Cable Modem and Multicast Authentication using RADIUS

(5)NA

No

Yes

No

No

Yes

Yes

Baseline Privacy Interface (BPI) Encryption

(5)NA

No

Yes

No

No

Yes

Yes

HTTP Security

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Named Method Lists for AAA Authorization & Accounting

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Per-Modem and Per-Host Access List Support

(8)NA

Yes

Yes

Yes

Yes

Yes

Yes

Per-User Configuration

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Reflexive Access Lists

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Vendor-Proprietary RADIUS Attributes

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Switching
Fast-Switched Policy Routing

(3)

Yes

Yes

Yes
Yes
Yes
Yes
WAN Optimization

PAD Subaddressing

(3)

Yes

Yes

Yes

Yes

Yes

Yes

WAN Services
Bandwidth Allocation Control Protocol (BACP)

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Enhanced Local Management Interface (ELMI)

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Frame Relay Enhancements

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Frame Relay MIB Extensions

(3)

Yes

Yes

Yes

Yes

Yes

Yes

Frame Relay Router ForeSight

(3)

Yes

Yes

Yes

Yes

Yes

Yes

ISDN Advice of Charge

 

Yes

Yes

Yes

Yes

Yes

Yes

ISDN Caller ID Callback

 

Yes

Yes

Yes

Yes

Yes

Yes

ISDN Multiple Switch Type

 

Yes

Yes

Yes

Yes

Yes

Yes

ISDN NFAS

 

Yes

Yes

Yes

Yes

Yes

Yes

MPPC

 

Yes

Yes

Yes

Yes

Yes

Yes

National ISDN Switch Types for BRI and PRI

(3)

Yes

Yes

Yes

Yes

Yes

Yes

VPDN MIB and Syslog Facility

(3)

Yes

Yes

Yes

Yes

Yes

Yes

X.25 Enhancements

 

Yes

Yes

Yes

Yes

Yes

Yes

X.25 Switching between PVCs and SVCs

(3)

Yes

Yes

Yes

Yes

Yes

Yes

1This column indicates the maintenance release in which the feature was introduced. For example, (3) means a feature is introduced in 12.0(3)T, and (6)NA means a feature was introduced in 11.3(6)NA. If this cell in this column is empty, this feature was introduced in the base release.

New and Changed Information

The following sections list the new hardware and software features supported by the Cisco uBR7200 series routers for Cisco IOS Release 12.0(7)T. 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.

Note The installation and configuration documentation for the Cisco uBR7223, Cisco uBR7246, and Cisco uBR7246 VXR routers has been consolidated into the single document Cisco uBR7200 Series Universal Broadband Router Installation and Configuration Guide , available on CCO and the Documentation CD-ROM. Refer to this document for the most current installation and configuration information about Cisco uBR7200 series universal broadband routers.

New Hardware Features in Release 12.0(7)T

The following new hardware features are supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(7)T.

Cable Modem Cards (MC12C and MC14C)

The software for the MC12C and MC14C cable modem cards is a driver running on the Cisco uBR7200 series universal broadband routers. Using a 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.

For more information, see the Cisco uBR7200 Series Cable Modem Card Installation and Configuration .

Cable Modem Card (MC16E)

The MC16E cable modem card provides one downstream and six upstream connections to the cable network, similar to the MC16C cable modem card, except that it supports the ITU J.83 Annex A physical layer and the proposed EuroDOCSIS (Annex A) standard (Cable Labs ECR RFI-R-98036). The MC16E card has the following differences with the current MC16C card:

All cable interface commands have been updated for the MC16E cable modem card.

IEEE 802.3z Gigabit Ethernet Port Adapter

The IEEE 802.3z Gigabit Ethernet Port Adapter (PA-GE) is a single-port adapter that provides a full-duplex, IEEE 802.3z compliant Gigabit Ethernet (GE) interface. The PA-GE is supported on the Cisco uBR7246 VXR universal broadband router; it is not supported on the Cisco uBR7223 and Cisco uBR7246 routers.

The PA-GE port adapter supports the following IEEE 802.3z interfaces:

Note The GE-PA requires optical fiber cable and a Gigabit Interface Converter (GBIC) appropriate to the interface being used.

Network Processing Engines (NPE-300)

In addition to the previously supported network processing engines (NPE), Cisco IOS Release 12.0(7)T supports the NPE-300 card. The NPE-300 has an RM7000 RISC microprocessor that operates at an internal clock speed of 262 MHz. The microprocessor has three levels of cache: a primary cache (32 KB, divided equally between instruction and data) and a secondary unified cache (256 KB, used for both data and instructions) that are internal to the microprocessor, and a third external cache (2 MB) that provides additional high-speed storage for both data and instructions.

The NPE-300 uses SDRAM (64 MB to 256 MB) for code, data, and packet storage. The card boots from its onboard Boot ROM (512 KB), so it does not require an upgrade to the Boot ROM on the I/O controller.

Caution The NPE-300 card is supported only on the Cisco uBR7246 VXR chassis when using a software image that supports it, such as Cisco IOS Release 12.0(7)T. Also, the NPE-300 card does not support the original MC11-FPGA modem card, so you must use the MC11C modem card or other current modem card (see "Cable Modem Cards" section).

For information on replacing the network processing engine, see Network Processing Engine Replacement Instructions , available on CCO and the Cisco Documentation CD-ROM.

OC-12c Dynamic Packet Transport Port Adapter

The OC-12c dynamic packet transport (DPT) port adapter is a dual-width OC-12c port adapter that provides a shared IP over SONET capability. The DPT port adapter is available in three models (multimode fiber; single-mode fiber, intermediate reach; and single-mode fiber, long reach).

The DPT port adapter provides the Cisco uBR7246 universal broadband router with two SC duplex ports. Each SC duplex port provides the physical connection to a device in a SONET OC-12 DPT ring. DPT rings can also be connected to SONET add-drop multiplexers (ADMs), thus allowing for the creation of small or very large DPT rings.

Note The DPT port adapter cannot be used on the Cisco uBR7223 universal broadband router.

uBR7246 VXR Chassis

Cisco IOS Release 12.0(7)T supports the uBR7246 VXR chassis, a high-performance platform that contains four slots for cable modem cards, two port adapter slots (supporting either two single-width or one dual-width port adapter), one slot for an input/output (I/O) controller card, and one slot for the NPE-300 high-performance network processing engine (NPE). An additional slot is available for a national clock card (which is not yet released). The Cisco uBR7246 VXR also supports dual power supplies; the second power supply is optional but provides redundancy and load-sharing capabilities.

Note The Cisco uBR7246 VXR router does not support the original MC11-FPGA cable modem card or the NPE-150 and NPE-200 processor cards.

New Software Features in Release 12.0(7)T

The following new software features are supported by the Cisco uBR7200 series universal broadband routers in Cisco IOS Release 12.0(7)T.

Baseline Privacy Interface MIB

Cisco uBR7200 series universal broadband routers now include support for the DOCSIS Baseline Privacy Interface (BPI) MIB. This allows an SNMP manager to monitor and manage the router's BPI configuration, including whether BPI is enabled, status of current authorization keys, current timeout values, real-time status counters, and additional information about authorization errors.

Note The SNMP manager must load the DOCS-BPI-MIB.my MIB to access the BPI attributes.

Enhanced Modem Status Display

The Cisco uBR7200 series universal broadband router supports polling of the cable modems to obtain parameter and status information on an ongoing basis. Two new Cisco IOS commands are added to support this feature.

The cable modem remote command configures the router for the polling interval; the no version of this command disables the status polling. The show cable modem remote-query command displays the collected information:

Firewall Enhancements

Cisco IOS Release 12.0(7)T enhances the Cisco IOS Firewall feature set with the Cisco IOS Firewall Phase II set of features:

For general information, see the description of the Cisco IOS Firewall Feature Set in the Cisco Product Catalog. For detailed information, see the Cisco IOS Firewall Feature Set documentation set, as well as the sections on Traffic Filtering and Firewalls in the Security Configuration Guide and Security Command Reference (available on the Documentation CD-ROM and CCO).

Interface Command Enhancements

A number of Cisco IOS cable interface commands have been enhanced:

The previous cable downstream if-output command has not changed and continues to output a standard modulated signal. The no cable downstream if-output command also has not changed---it stops all signal output and shuts down the interface.

Upstream Address Verification Enhancement

This feature prevents the spoofing of IP addresses by verifying that each upstream data packet comes from the cable modem known to be associated with the source IP address in the packet. 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 that supports the new LEASEQUERY message type.

Note Cisco Network Registrar (CNR) supports the LEASEQUERY message type in software release 3.01(T) and greater.

No New Features in Release 12.0(6)T

There are no new hardware or software features supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(6)T, which was not officially released.

New Hardware Features in Release 12.0(5)T

The following new hardware features are supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(5)T.

Cable Modem Card (MC16C)

The software for the MC16C cable modem card is a driver running on the Cisco uBR7200 series universal broadband routers. Using a 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.

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.

Multichannel DS1/PRI Port Adapter

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.

Multichannel E1/PRI Port Adapter

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 universal broadband 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.

New Software Features in Release 12.0(5)T

The following new software features are supported by the Cisco uBR7200 series universal broadband routers in Cisco IOS Release 12.0(5)T.

Basic Wiretap Support

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 IOS Firewall

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 offers 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 Firewall Feature Set feature module, available on the Documentation CD-ROM and CCO.

Downstream Frequency Override

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.

Note The following features are new to the Cisco IOS Release 12.0 T release train, but were first introduced in the Cisco IOS Release 12.0(4)XI1 early deployment images.

Additional or Changed Show Commands

The Cisco uBR7200 series universal broadband routers contain the following additional or changed show commands:

Automated Double Authentication

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 connects to the network access server or router using Telnet 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.

Burst Profile Configuration

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.

Note Multiple burst profiles are supported on the MC11C, MC12C, MC14C, MC16B, and MC16C cable modem cards. Only one profile is supported on the original MC11-FPGA card.

Cable Modem and Multicast Authentication Using RADIUS

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.

DHCP Client ID/Remote ID Options

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.

Note This feature is separate from the cable modem's ability to support multiple CPE devices. For example, depending on the Cisco IOS software release being used, Cisco's uBR900 series cable access routers can support a maximum of either 3 or 254 CPE devices. Also, by default, a DOCSIS-compliant cable modem supports one CPE device, but this can be changed by modifying the MAX CPE parameter in the modem's DOCSIS configuration file.

DHCP Cable Modem Host ID

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 and DHCPREQUEST 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.

DOCSIS 1.0 Quality of Service

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 cable modem termination system (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 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:

Downstream Channel ID

This feature allows all cable modems in an HFC network to identify themselves via unique downstream channel IDs instead of their downstream frequencies.

Downstream Rate Shaping with IP Type of Service Bits

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).

Encrypted Baseline Privacy Key Exchange

Baseline privacy extensions permit the encryption of data transferred between the cable modem and the Cisco uBR7200 series 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.

Note For Cisco Systems to be able to provide non-export-controlled images, the standard image (uBR7200-p-mz) will no longer support baseline privacy. Only new images explicitly identified as encryption images (uBR7200-k1p-mz) will support baseline privacy.

Improved and Extended Command-Line Interface

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.

Integrated Time-of-Day Server

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.

Inter-Switch Link Support for Non-Cable Interfaces

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.

Note The ISL feature is supported only on Fast Ethernet port adapters when using an "IP Plus" image (see Table 2).

Management Information Base Enhancements

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:

Parse Bookmarks

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.

Per-Modem Filters

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-address basis.

Service Assurance Agent

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:

Spectrum Management Enhancements

The following spectrum management enhancements are available in the Cisco uBR7200 series universal broadband routers:

Upstream Address Verification

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 that supports the new LEASEQUERY message type.

Upstream and Downstream Traffic Shaping

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.

New Hardware Features in Release 12.0(3)T

The following new hardware feature is supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(3)T.

Cable Modem Card (MC16B)

The MC16B cable 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.

For more information, refer to the Update to the Cisco uBR7200 Series Cable Modem Card Installation and Configuration for the MC16B EFT Card publication.

New Software Features in Release 12.0(3)T

The following new software features are supported by the Cisco uBR7200 series universal broadband routers in Cisco IOS Release 12.0(3)T.

Committed Access Rate

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 SNMPv3

Cisco IOS Release 12.0(3)T implements the latest revision (version 3) of the Simple 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 RFC 2570, RFC 2571, RFC 2572, RFC 2573, RFC 2574, and RFC 2575.

Integrated DHCP Server

The Cisco uBR7200 series universal broadband router offers an integrated Dynamic Host Configuration Protocol (DHCP) server to simplify provisioning of cable modems.

NetFlow Policy Routing

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.

Netflow Switching

NetFlow switching is a high-performance, network-layer switching path that provides network administrators with access to "call detail recording" information from their data networks; this information includes details such as user, protocol, port, type of service information, and the duration of the communication. This data can be used for a variety of purposes, including billing, enterprise accounting, network planning and performance analysis, quality of service (QoS) bandwidth management, security policies, and data warehousing/mining for marketing purposes.

The collected NetFlow data is sent out via UDP packets to a workstation running the Netflow Flowcollector server, which can collect data from multiple routers for later analysis by a user running the Netflow Flowanalyzer application. Through the NetFlow Data Export feature, traffic information can also be passed to external applications that perform functions such as billing or network performance analysis.

NetFlow also provides a highly efficient mechanism that can process security access lists without incurring the same performance penalty as other available switching methods. In conventional switching at the network layer, each incoming packet is handled on an individual basis with a series of functions to perform access list checks, capture accounting data, and switch the packet. In contrast, after NetFlow switching identifies a flow and processes the access list for the flow's first packet, all subsequent packets are handled on a "connection-oriented" basis as part of the flow. This avoids further access list checks on the flow, and packet switching and statistics capture are performed in tandem.

Note A network flow is identified as a unidirectional stream of packets between a given source and destination that has a unique combination of the following fields: source IP address, destination IP address, source port number, destination port number, protocol type, type of service, and input interface.

Use the ip flow-cache, ip flow-export, and ip route-cache commands to configure Netflow Switching. See the Cisco IOS Release 12.0 Cisco IOS Switching Services Configuration Guide on the Documentation CD-ROM and CCO for more details.

Process MIB

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.

Resource Reservation Protocol

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.

Tag Switching

Tag Switching is a Cisco-developed technology that implements a next-generation architecture for the Internet backbone and large intranets. Tags placed on the fronts of packets contain forwarding information used for making switching decisions and applying network services.

Tag Switching has become the foundation for flexible Layer 3 virtual private networks (VPNs), QoS handling, and traffic engineering. It also forms the basis for the emerging IETF standard for Multiprotocol Label Switching (MPLS).

A Tag Switching infrastructure combines with advanced routing protocol capabilities to define IP VPNs by selectively advertising IP reachability information to just those subscribers within the same VPN or extranet, thus keeping different VPN traffic logically separate. The subscribers are then all connected via Tag switch paths (TSPs).

Forwarding is based entirely upon the assigned Tag values (rather than IP destination prefixes), eliminating the requirement for uniqueness in the IP addresses that are used. This feature means subscribers to different VPNs do not have to concern themselves with the problems that would otherwise occur when connecting networks with different subnetworks into an integrated network.

WCCP

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.)

Weighted Random Early Detection

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.

Weighted Fair Queuing

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.

Limitations and Restrictions

Cisco IOS Release 12.0(7)T 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.

Distinguishing Between Cable Modems

Because the DOCSIS-specified Telephony Channel Descriptor (TCD) messages do not distinguish between telco-return and two-way cable modems, CLI commands on the Cisco uBR7200 series router do not distinguish between these two types of cable modems. In addition, the MC16E cable modem card cannot distinguish between EuroDOCSIS cable modems and set-top boxes (STBs).

Online Insertion and Removal of Cable Modem Cards

When replacing a cable modem card using online insertion and removal (OIR), Cisco recommends that you use the shutdown interface command on the card's interfaces before removing the card. After inserting the replacement card, use the no shutdown command to reenable the card's interfaces.

This is especially important when replacing the cable modem card that supplies the MAP timer. If you remove this cable modem card without using the shutdown command, it disables the MAP timer and causes all cable modems attached to the Cisco uBR7200 series router to go offline. The shutdown command, however, transfers the MAP timer function to the next available cable modem card, so that the cable modems attached to the other interfaces are not affected by the OIR of this particular cable modem card.

Note Use the show controller command to display which cable modem card is supplying the MAP timer.

Port Adapter Support for Cisco uBR7246 VXR

The port adapters shown in Table 5 must be at the indicated hardware revision levels to be used in the Cisco uBR7246 VXR router. If an earlier revision level of one of these port adapters is installed in a Cisco uBR7246 VXR router, the port adapter is disabled and the following error message is displayed:

%PA-3-REVNOTSUPPORTED: PA in slot x (xxxx) requires base h/w revision of (x.xx) for this chassis


Table 5: Minimum Required Hardware Revision for Port Adapters Installed in the Cisco uBR7246 VXR Router
Port Adapter Required Hardware Revision Minimum Part Number

PA-4E

1.14

800-02070-04

PA-8E

1.14

800-02069-04

PA-H

1.17

800-02747-06

PA-2H

1.3

800-03306-02

PA-A3-E3

2.0

800-02602-04

PA-A3-T3

2.0

800-02600-04

Note The Cisco uBR7223 and Cisco uBR7246 routers are not affected by this note and do not require these revision levels. Port adapters not shown in Table 5 are supported as described in the section "Port Adapter Cards,".

Signal-Noise Ratio Statistics

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.

Using Multiple PCs with a Cable Modem

The MAX CPE parameter in a cable modem's DOCSIS configuration file determines how many PCs (or other CPE devices) are supported by that cable modem. The default value for the MAX CPE parameter is 1, which means only one PC can be connected to the cable modem.

The DOCSIS 1.0 specification states that a CMTS cannot age out MAC addresses for CPE devices, so with the default configuration, the first PC connected to a cable modem is normally the only one the CMTS recognizes as valid. If a subscriber replaces an existing PC or changes its network interface card (NIC) to one with a different MAC address, the CMTS will refuse to let the PC come online because this would exceed the number of CPE devices specified by the MAX CPE parameter.

To allow a subscriber to replace an existing PC or NIC, the following workarounds are possible:

Caution Do not use the clear arp command on the Cisco uBR7200 series router for this purpose as it will terminate connectivity for all PCs serviced by that router until the PC performs a DHCP release/renew request or reboots. (The router must be in source-verify mode; see the cable source-verify command.)

Important Notes

The following sections contain important notes about Cisco IOS Release 12.0(7)T that apply to Cisco uBR7200 series universal broadband routers.

Last Maintenance Release of Cisco IOS Release 12.0 T

Cisco IOS Release 12.0(6)T has been renamed 12.0(7)T to align this release with the 12.0(7) mainline release. The closed caveats for Release 12.0(7)T are identical to the caveats closed in the 12.0(7) mainline release. There was no change in the feature content of the renamed release--the features in 12.0(6)T are the same as 12.0(7)T. Release 12.0(7)T is the last maintenance release of the 12.0 T release train.

Customers needing closure of caveats for the 12.0 T features should migrate to the 12.1mainline release, which has the complete feature content of Release 12.0 T and will eventually reach General Deployment (GD). Release 12.0 T is a super set of the 12.0 mainline release, so all caveats closed in the 12.0 mainline are also closed in 12.0 T.

10-dB Attenuator with Current Modem Cards

The MC11C, MC12C, MC14C, and MC16C modem cards deliver +42 dBmV output power to the IF-to-RF upconverter at the CATV headend, which is 10-dB greater than previously released modem cards. Certain upconverters require a 10-dB attenuator in the downstream signal between one of these modem cards and the upconverter to avoid overloading the upconverter input, which would interfere with downstream transmissions, particularly in the 256-QAM mode. See the Downstream IF Power-Level Adjustment Notice on CCO and the Documentation CD-ROM for more information on which upconverters require installing the attenuator.

Configuring the Routing Protocol Causes a Reset of the Cable Modems

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.

DHCP Relay-Agent Information

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.)

MC11 Support

The original MC11 modem card (MC11-FPGA) is supported only on Cisco uBR7223 and uBR7246 routers that are using the NPE-150 or NPE-200 processor cards. If the router is using a later processor card, such as the NPE-300, the MC11-FPGA is not supported and current modem cards such as the MC11C card must be used instead.

Note The MC11-FPGA modem card is not supported on the Cisco uBR7246 VXR routers.

Minimum 64 MB of DRAM is Required

The Cisco uBR7200 series universal broadband router must have a minimum of 64 MB of DRAM to run all Cisco IOS Release 12.0(7)T images.

Supported MIBs

The Cisco uBR7200 series universal broadband routers support the following categories of MIBs:

The Cable-Specific MIBs and Deprecated MIBs are described in the following sections. For information on the SNMP standard MIBs and Cisco's platform and network-layer enterprise MIBs, see Cisco's MIB website at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.

Cable-Specific MIBs

Table 6 shows the cable-specific MIBs that are supported on the Cisco uBR7200 series universal broadband routers. The table also provides a brief description of each MIB's contents and the Cisco IOS software release in which the MIB was initially functional---earlier releases might have had unsupported prototype versions of the MIB; later releases might have added new attributes and functionality. Because of interdependencies, the MIBs must be loaded in the order given in the table.

Note The names given in Table 6 are the filenames for the MIBs as they exist on Cisco's FTP site (ftp://ftp.cisco.com/pub/mibs/ or http://www.cisco.com/public/mibs). Most MIB s are available in both SNMPv1 and SNMPv2 versions; the SNMPv1 versions have V1SMI as part of their filenames.


Table 6: MIBs Supported on Cisco uBR7200 Series Universal Broadband Routers
MIB Filename Description Release

SNMPv2-SMI.my

SNMPv2-SMI-V1SMI.my

This module specifies the Structure of Management Information (SMI) for SNMPv2, as defined in RFC 1902.

11.3T

SNMPv2-TC.my

SNMPv2-TC-V1SMI.my

This module defines the textual conventions as specified in pages 4, 10-11 of RFC 854.

11.3T

CISCO-SMI.my

CISCO-SMI-V1SMI.my

This module specifies the Structure of Management Information (SMI) for Cisco's enterprise MIBs.

11.3T

CISCO-TC.my

CISCO-TC-V1SMI.my

This module defines the textual conventions used in Cisco's enterprise MIBs.

11.3T

IF-MIB.my

IF-MIB-V1SMI.my

This module describes generic objects for the Layer 3 network interface sublayers. This MIB is an updated version of MIB-II's if table, and incorporates the extensions defined in RFC 1229.

11.3T

CISCO-CABLE-SPECTRUM-MIB.my

CISCO-CABLE-SPECTRUM-MIB-V1SMI.my

This module describes the spectrum management flap-list attributes.

12.0(5)T1

DOCS-IF-MIB.my

DOCS-IF-MIB-V1SMI.my

This module describes the DOCSIS-compliant Radio Frequency (RF) interfaces in cable modems and cable modem termination systems, as defined in RFC 2670.

11.3(4)NA

DOCS-BPI-MIB.my

This module---available in an SNMPv2 version only---describes the attributes for the DOCSIS-specified Baseline Privacy Interface (BPI) on cable modems and the CMTS.

11.3(11)NA
12.0(7)XR
12.0(7)T

CISCO-DOCS-EXT-MIB.my

CISCO-DOCS-EXT-MIB-V1SMI.my

This module extends the DOCSIS standard RFI MIB (DOCS-IF-MIB) with Cisco-specific extensions, such as QoS attributes and connection status and other information regarding the cable modems and CPE devices supported by the CMTS.

11.3(9)NA
12.0(5)T1

Deprecated MIBs

A number of older Cisco-provided MIBs have been replaced with more scalable, standardized MIBs; the MIBs have filenames that start with "OLD" and first appeared in Cisco IOS Release 10.2. The functionality of these MIBs has already been incorporated into replacement MIBs, but the old MIBs are still present to support existing Cisco IOS products or NMS applications. However, because the deprecated MIBs will be removed from support in the future, you should update your network management applications and scripts to refer to the table names and attributes that are found in the replacement MIBs.

Table 7 shows the deprecated MIBs and their replacements. In most cases, SNMPv1 and SNMPv2 replacements are available, but some MIBs are available only in one version. A few of the deprecated MIBs do not have replacement MIBs; support for these MIBs will be discontinued when Cisco IOS software no longer supports the corresponding feature set.


Table 7: Replacements for Deprecated MIBs
Deprecated MIB Replacement MIBs
SNMPv1 MIB SNMPv2 MIB

OLD-CISCO-APPLETALK-MIB

RFC1243-MIB

OLD-CISCO-CHASSIS-MIB

ENTITY-MIB-V1SMI.my

ENTITY-MIB

OLD-CISCO-CPU -MIB

 

CISCO-PROCESS-MIB.my

OLD-CISCO-DECNET-MIB

 

OLD-CISCO-ENV-MIB

CISCO-ENVMON-MIB-V1SMI.my

CISCO-ENVMON-MIB

OLD-CISCO-FLASH-MIB

CISCO-FLASH-MIB-V1SMI.my

CISCO-FLASH-MIB

OLD-CISCO-INTERFACES-MIB

IF-MIB-V1SMI.my
CISCO-QUEUE-MIB-V1SMI.my

IF-MIB
CISCO-QUEUE-MIB

OLD-CISCO-IP-MIB

 

OLD-CISCO-MEMORY-MIB

CISCO-MEMORY-POOL-MIB-V1SMI.my

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-V1SMI.my

CISCO-CONFIG-COPY-MIB

OLD-CISCO-TCP-MIB

CISCO-TCP-MIB-V1SMI.my

CISCO-TCP-MIB

OLD-CISCO-TS-MIB

 

OLD-CISCO-VINES-MIB

CISCO-VINES-MIB-V1SMI.my

CISCO-VINES-MIB

OLD-CISCO-XNS-MIB

 

Note Some of the MIBs listed in Table 7 represent feature sets that are not supported on Cisco uBR7200 series universal broadband routers.

Upgrading from Previous Releases

Because of changes in handling the MAC address between Cisco IOS Releases 11 and 12.0, you must clear the Address Resolution Protocol (ARP) tables after upgrading from Cisco IOS Release 11 to Release 12.0(7)T. 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.

Upgrading from a Previous Version of a Modem Card

Online insertion and removal (OIR) is supported only for the same version and model of a modem card (for example, replacing an MC16C modem card with another MC16C modem card). If you are upgrading from one version of a modem card, hot-swapping does not preserve the card's configuration because the Cisco IOS software recognizes that the new card is not identical to the old one.

You can use OIR to hot-swap an older version of a modem card with a newer one, but you must then reload the card's configuration from NVRAM to restore the modem card to operational status.

Warning Messages During Boot

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.

Caveats for Release 12.0(7)T

This section lists the caveats that describe potentially unexpected behavior in Cisco IOS Release 12.0(7)T. 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.

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 .

Note If you have an account with CCO, you can use Bug Navigator Toolkit to find caveats of any severity for any release. You can reach Bug Navigator on CCO at Software Center: Tools: Software Bug Toolkit: Bug Navigator II or at http://www.cisco.com/support/bugtools.

Open Caveats for Release 12.0(7)T

This section describes possibly unexpected behavior by Release 12.0(7)T. Unless otherwise noted, these caveats apply to all 12.0 releases up to and including 12.0(7)T.

When an existing cable modem is swapped with a new one, such as a field replacement, the MAC address for the PC is still associated with the old cable modem. This can also happen if a PC is moved from one cable modem to another.
The workaround is to enter the clear cable host mac address command on the Cisco uBR7200 series router to remove the PC's MAC address from the router's internal address tables. The PC's MAC address will be rediscovered and associated with the correct cable modem during the next DHCP lease cycle.
Caution Do not use the clear arp command on the Cisco uBR7200 series router for this purpose; it will terminate connectivity for all PCs serviced by that router until the PC performs a DHCP release/renew request or reboots. (The router must be in source-verify mode; see the cable source-verify command.)
A Cisco uBR7246 XVR can crash when IP packets being sent over a Packet over SONET (POS) interface contain a bad IP checksum. The only current workaround is to find the source of the incorrectly sent IP packets and correct the problem at the source.
If a POS interface starts receiving incoming traffic while a Cisco uBR7246 or uBR7246 VXR router is still booting, the router stops booting until the incoming traffic stops. The workaround is to prevent any incoming traffic from coming into a POS interface until the router finishes its bootup process. (This problem can also occur on a Cisco 7200 series router.)
When an MC16C or MC16S cable modem card is configured for a mixed burst profile (station maintenance packets are using QPSK modulation and data packets are using 16-QAM modulation), the MC16S does not hop to a new frequency band when noise interferes with data packets but only at much higher noise levels when station maintenance packets are dropped.
The workaround is to use 16-QAM modulation for all modes (request, initial, station, and data).
Note The enhancements needed to resolve this caveat are being tracked in CSCdm62122.
If the show controller command is entered during online insertion and removal (OIR) of a cable modem line card or port adapter, the Cisco uBR7200 series router can crash and must be reloaded to recover. The workaround is to avoid entering CLI commands when you are physically removing and inserting a cable modem line card or port adapter. (This problem can also occur on other routers.)
When the debug cable command is used to enable debugging on a cable interface, the following message is shown for each cable modem that comes online: "Failed to find CM with mac address 0000.0000.0000". This error message is only cosmetic and can be ignored.
When a Cisco uBR7200 series router (as well as a Cisco 7200 series router) is first being configured or being reloaded, an installed POS port adapter can display the following error message: "Error in encaps setup. Encapsulation not changed."
This error message is cosmetic and can be disregarded.
If a POS port adapter has fair-queuing enabled, it cannot be replaced via online insertion and removal (OIR). If such a POS port adapter is replaced by OIR, it can no longer transmit packets. The router must be reloaded to recover from this error; the only workaround is to disable fair-queuing before replacing a POS port adapter.
When noise with a minimum frequency of 0.2 MHz at an amplitude greater than 20 dBmV occurs on an upstream channel on an MC16S cable modem card, noise can also occur at the center frequency harmonics. This affects the MC16S card's ability to analyze the noise levels on the different upstream channels.
When multiple DHCP servers with different IP addresses are available on a cable interface, the show cable modem command might show a different IP address than the one used for that particular cable modem. The workaround is to use a single DHCP server.
Dual-port Fast Ethernet port adapters report a high input error rate when the traffic reaches 90 kilo packets per second (kpps) or greater on a Cisco uBR7200 series router. This problem does not occur on single-port Fast Ethernet port adapters. There is no workaround.
When acting as the ToD server, the Cisco uBR7200 series router replies to a cable modem's ToD request by creating a packet with a source address that equals the IP address of the cable modem line card providing the downstream interface for that cable modem. This IP address might not match the source address specified by the cable modem in its original request packet (as might be the case in a unicast or forwarded packet), and certain cable modems will reject the ToD reply as a security measure.
The workaround is to specify the cable modem line card's IP address as the ToD server's IP address in the cable modem's DOCSIS configuration file.
When a cable modem card is replaced using online insertion and removal (OIR), the upstream and downstream channel information is missing from the DOCS-IF-MIB MIB for that modem card and all cable modem cards below it.

Caveats for Release 12.0(1)T through 12.0(6)T

This section describes possibly unexpected behavior by Release 12.0(6)T. Unless otherwise noted, these caveats apply to all 12.0 releases up to and including 12.0(6)T. For additional caveats applicable to Cisco IOS Release 12.0 T, 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(7)T.

The latest versions of Smart Modular and Sharp Flash memory cards used to store Diagnostics and Cisco IOS software images can report unrecoverable write errors. Affected Flash cards use a new Sharp (LH28F016SCT) chip set. The original Smart Modular and Intel Flash cards are not affected.
There was no clean workaround; possible suggestions to avoid the problem are to reformat the Flash memory, store fewer images, or try storing images in a different order.
This caveat described situations in which the CPU load on a Cisco uBR7200 series router was thought to be too high, especially when compared to a Cisco 7200 series router in a similar configuration. For example, the CPU load on an idle Cisco uBR7200 series router was found to be 15 percent, while an idle Cisco 7200 series router had a CPU load near zero percent.
The difference in CPU utilization is due to the overhead of maintaining the cable interface, as required by DOCSIS specifications. The majority of this overhead is in maintaining the mini-slot allocation on the upstreams and the sending of MAP messages (such as maintenance and keepalive messages) to cable modems, which must be done even if no actual traffic is being transmitted.
If cable modems transmitted data with an odd MAC header length, DHCP requests were filtered out, causing the modems to be unable to obtain an IP address. Modems were then stuck in their initialization states.
Cable modems from at least two different vendors were known to be affected by this problem. Modems from other vendors might experience the same problem, either always or randomly.
This caveat included two issues:
In accordance with the initial DOCSIS telco-return specification, the cable telco-return radius-realm string command accepted only alphanumeric characters for the string parameter, excluding special characters such as the at-sign (@). This has been changed so that any valid realm domain name can be specified as the string parameter.
A similar problem occurred with the telco-return password string. This has been changed so that passwords can now include special characters such as the dollar sign ($) and number sign (#).
When a telco-return cable modem was moved from one cable interface to another, the ARP table on the Cisco uBR7200 series router contained duplicate entries for the cable modem, one for the old interface and one for the new interface. The workaround is to use the shutdown and no shutdown interface commands on the old cable interface to remove the old ARP entries.
When the G.729 or G.711 QoS profile was modified, the profile could be deleted when not in use. These profiles now remain regardless of whether they are in use.
When a PC or other CPE device serviced by a telco-return cable modem released its IP address through a DHCPRELEASE request, the Cisco uBR7200 series router did not decrease the CPE counter for that modem; this might have prevented additional CPE devices from coming online because the cable modem's MAX CPE limit was reached. The workaround is to clear the old CPE device using the clear cable host command.
The following attributes in the CISCO-CABLE-SPECTRUM-MIB enterprise MIB did not operate as described in the MIB file:
The workaround is to set these attributes using CLI commands.

Related Documentation

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:

Release-Specific Documents

The following documents are specific to Release 12.0 and are located on CCO and the Documentation CD-ROM:

On CCO:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0
On the Documentation CD-ROM:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Release Notes: Cross Platform Release Notes
Technical Documents
As a supplement to the caveats listed in "Caveats for Release 12.0(7)T" in these release notes, see Caveats for Cisco IOS Release 12.0  and Caveats for Cisco IOS Release 12.0 T , which contain caveats applicable to all platforms for all maintenance releases of Release 12.0.
On CCO:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Caveats
On the Documentation CD-ROM:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS 12.0: Caveats
Note If you have an account with CCO, you can use Bug Navigator Toolkit to find caveats of any severity for any release. You can reach Bug Navigator on CCO at Software Center: Tools: Software Bug Toolkit: Bug Navigator II or at http://www.cisco.com/support/bugtools.

Platform-Specific Documents

The following platform-specific documents are available.

Cisco uBR7200 Series Routers

These documents are available for the Cisco uBR7200 series universal broadband routers on CCO and the Documentation CD-ROM:

On CCO:

Technical Documents: Documentation Home Page: Broadband/Cable Solutions: Cisco uBR7200 Series Universal Broadband Routers

On the Documentation CD-ROM:

Cisco Product Documentation: Broadband/Cable Solutions: Cisco uBR7200 Series Universal Broadband Routers

Cisco uBR900 Series Cable Access Routers

The documentation for the Cisco uBR900 series cable access routers are available on CCO and the Documentation CD-ROM at the following locations:

On CCO:

Technical Documents: Documentation Home Page: Broadband/Cable Solutions: Cisco uBR900 Series Cable Access Routers

On the Documentation CD-ROM:

Cisco Product Documentation: Broadband/Cable Solutions: Cisco uBR900 Series Cable Access Routers

Feature Modules

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:

Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation

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

Cisco IOS Software Documentation Set

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.

Documentation Modules

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:

Technical Documents: 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: Cisco IOS Interface Configuration Guide or Cisco IOS Interface Command Reference

Release 12.0 Documentation Set

Table 8 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.

Note You can find the most current Cisco IOS documentation on CCO and the Documentation CD-ROM. These electronic documents may contain updates and modifications made after the paper documents were printed.

On CCO:

Technical Documents: 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


Table 8: Cisco IOS Software Documentation Set for Release 12.0
Books Chapter Topics

  • Configuration Fundamentals Configuration Guide

  • Configuration Fundamentals Command Reference

Configuration Fundamentals Overview
Cisco IOS User Interfaces
File Management
System Management

  • Bridging and IBM Networking Configuration Guide

  • Bridging and IBM Networking Command Reference

Transparent Bridging
Source-Route Bridging
Token Ring Inter-Switch Link
Remote Source-Route Bridging
DLSw+
STUN and BSTUN
LLC2 and SDLC
IBM Network Media Translation
DSPU and SNA Service Point
SNA Frame Relay Access Support
APPN
Cisco Database Connection
NCIA Client/Server Topologies
Cisco Mainframe Channel Connection
Airline Product Set

  • Dial Solutions Configuration Guide

  • Dial Solutions Command Reference

Dial-In Port Setup
Dial-In Terminal Services
Dial-on-Demand Routing (DDR)
Dial Backup
Dial-Out Modem Pooling
Large-Scale Dial Solutions
Cost-Control Solutions
ISDN
X.25 over ISDN
VPDN
Dial Business Solutions and Examples

  • Cisco IOS Interface Configuration Guide

  • Cisco IOS Interface Command Reference

Interface Configuration Overview

  • Network Protocols Configuration Guide, Part 1

  • Network Protocols Command Reference, Part 1

IP Addressing
IP Services
IP Routing Protocols

  • Network Protocols Configuration Guide, Part 2

  • Network Protocols Command Reference, Part 2

AppleTalk
Novell IPX

  • Network Protocols Configuration Guide, Part 3

  • Network Protocols Command Reference, Part 3

Apollo Domain
Banyan VINES
DECnet
ISO CLNS
XNS

  • Security Configuration Guide

  • Security Command Reference

AAA Security Services
Security Server Protocols
Traffic Filtering and Firewalls
IP Security and Encryption
Passwords and Privileges
Neighbor Router Authentication
IP Security Options

  • Cisco IOS Switching Services Configuration Guide

  • Cisco IOS Switching Services Command Reference

Switching Paths for IP Networks
Virtual LAN (VLAN) Switching and Routing

  • Wide-Area Networking Configuration Guide

  • Wide-Area Networking Command Reference

ATM
Frame Relay
SMDS
X.25 and LAPB

  • Voice, Video, and Home Applications Configuration Guide

  • Voice, Video, and Home Applications Command Reference

Voice over IP
Voice over Frame Relay
Voice over ATM
Voice over HDLC
Video Support
Universal Broadband Features

  • Quality of Service Solutions Configuration Guide

  • Quality of Service Solutions Command Reference

Classification
Scheduling
Packet Drop
Traffic Shaping
ATM QoS
SNA QoS
Line Protocols

  • Cisco IOS Software Command Summary

  • Dial Solutions Quick Configuration Guide

  • System Error Messages

  • Debug Command Reference

 

Note Cisco Management Information Base (MIB) User Quick Reference is no longer published. For the latest list of MIBs supported by Cisco, see Cisco Network Management Toolkit on Cisco Connection Online. From CCO, click on the following path: Service & Support: Software Center: Network Mgmt Products: Cisco Network Management Toolkit: Cisco MIB.

Service and Support

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.

Note If you purchased your product from a reseller, you can access CCO as a guest. CCO is Cisco Systems' primary real-time support channel. Your reseller offers programs that include direct access to CCO services.

For service and support for a product purchased directly from Cisco, use CCO.

Software Configuration Tips on the Cisco Technical Assistance Center Home Page

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

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.

Note If you are a network administrator and need personal technical assistance with a Cisco product that is under warranty or covered by a maintenance contract, contact Cisco's Technical Assistance Center (TAC) at 800 553-2447, 408 526-7209, or tac@cisco.com. To obtain general information about Cisco Systems, Cisco products, or upgrades, contact 800 553-6387, 408 526-7208, or cs-rep@cisco.com.

Documentation CD-ROM

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.

If you are reading Cisco product documentation on the World Wide Web, you can submit comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco. We appreciate your comments.





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Posted: Thu Dec 9 21:17:17 PST 1999
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