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Table of Contents

Release Notes for Cisco uBR7200 Series
for Cisco IOS Release 12.0(8)SC1

Release Notes for Cisco uBR7200 Series
for Cisco IOS Release 12.0(8)SC1

February 7, 2000

These release notes for the Cisco uBR7200 series universal broadband routers describe the enhancements provided in Cisco IOS Release 12.0(8)SC1, which is an early deployment release that provides a stable platform for cable products with essential new features and fixes to software caveats. 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(8)SC1, see the "Caveats" section.

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-based 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 telco return, where the cable modem's return path to the CMTS is via a dial-up telephone line connection.

Note The Cisco IOS Release 12.0 SC software supports only two-way, DOCSIS-based cable modems and set top box (STB) units with integrated DOCSIS modems. The SC release excludes DOCSIS 1.0 extension support.

The CISCO uBR7200 series 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 RF Customer Premises Equipment (CPE) and the backbone data network. The chassis 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(8)SC1. Release 12.0 SC 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 Release 12.0 SC early deployment releases.


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

Release 12.0(8)SC1

Bug fixes

None

Release 12.0(8)SC

Cable Interface Bundling

MC16E Cable Modem Card

  • 2/2000

Release 12.0(7)SC

None

  • OC-12c Dynamic Packet Transport Port Adapters

  • IEEE 802.3z Gigabit Ethernet Port Adapter

  • NPE-300 Network Processing Engine (for uBR7246 VXR only)

  • Cisco uBR7246 VXR Chassis

Now

12/1999

2/2000


2/2000

Release 12.0(6)SC

  • Encrypted Baseline Privacy Key Exchange

  • DOCSIS Quality of Service Enhancements

  • Spectrum Management Enhancements (in earlier early deployment releases)

  • Upstream Traffic Shaping

  • Downstream Rate Shaping with ToS Bits

  • MC11-FPGA Cable Modem Card

  • MC11C Cable Modem Card

  • MC12C Cable Modem Card

  • MC14C Cable Modem Card

  • MC16B Cable Modem Card

  • MC16C Cable Modem Card

  • For port adapters, refer to Table 3

Now

1Only major features are listed. See the Release Notes for each particular release for a comprehensive feature list.

System Requirements

This section describes the system requirements for Release 12.0(8)SC1:

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(8)SC1. 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(8)SC1 Feature Sets
Feature Set Image Name Required
Flash
Memory 		Required
DRAM
Memory 		Runs
From 		Feature
History

DOCSIS 2-WAY

ubr7200-p-mz

16 MB Flash

64 MB DRAM

RAM

Added in Cisco IOS Release 12.0(6)SC

DOCSIS 2-WAY IP+

ubr7200-ps-mz

16 MB Flash

64 MB DRAM

RAM

Added in Cisco IOS Release 12.0(6)SC

DOCSIS 2-WAY W/BPI

ubr7200-klp-mz

16 MB Flash

64 MB DRAM

RAM

Added in Cisco IOS Release 12.0(6)SC

DOCSIS 2-Way IP+ W/BPI

ubr7200-klps-mz

16 MB Flash

64 MB DRAM

RAM

Added in Cisco IOS Release 12.0(6)SC

The image subset legend for Table 2 is as follows:

Note All Cisco IOS Release 12.0 SC images require 64 MB of DRAM.

System Interoperability

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

To correct this problem, decrease the CNR buffers for incoming requests to 25 and outgoing requests to 50. These numbers depend on factors such as the network, server platform, number of STBs, and cable modems.

Hardware Supported

Cisco IOS Release 12.0(8)SC1 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(8)SC1 also supports the NPE-300 card, which has an R7000 microprocessor that operates at an internal clock speed of 262 MHz (currently supported only on the Cisco uBR7426 VXR).

Cable Modem Cards

Cisco IOS Release 12.0(8)SC1 supports the following cable modem cards:

Port Adapter Cards

Table 3 lists and describes the port adapters supported by Cisco uBR7200 series routers in Cisco IOS Release 12.0(8)SC1.

Note Not all Cisco uBR7200 series universal broadband routers support the same mixture of port adapters in Cisco IOS releases. 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

Cisco IOS Release 12.0(6)SC

PA-A1-OC3MM

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

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

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

Cisco IOS Release 12.0(6)SC

PA-A2-4E1XC-E3ATM

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

Cisco uBR7246

Cisco IOS Release 12.0(6)SC

PA-A2-4T1C-OC3SM

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

Cisco uBR7246

Cisco IOS Release 12.0(6)SC

PA-A2-4T1C-T3ATM

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

Cisco uBR7246

Cisco IOS Release 12.0(6)SC

PA-A3-E3

1-port E3 ATM, PCI5-based port adapter

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-A3-T3

1-port T3 ATM, PCI-based port adapter

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-A3-OC3MM

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

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

PA-A3-OC3SMI

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

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

PA-A3-OC3SML

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

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

Ethernet

PA-4E

4-port Ethernet 10BaseT port adapter

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

PA-8E

8-port Ethernet 10BaseT port adapter

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

PA-FE-TX

1-port 100BaseTX Fast Ethernet port adapter

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

PA-FE-FX

1-port 100BaseFX Fast Ethernet port adapter

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

PA-2FEISL-TX

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

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

PA-2FEISL-FX

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

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

PA-12E/2FE

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

Cisco uBR7246

Cisco IOS Release 12.0(6)SC

PA-GE

1-port IEEE 802.3z Gigabit Ethernet port adapter

Cisco uBR7246 VXR only

Cisco IOS Release 12.0(7)SC

High-Speed Serial Interfaces (HSSI)

PA-H

1-port HSSI port adapter

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

PA-2H

2-port HSSI port adapter

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

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

Cisco IOS Release 12.0(6)SC

PA-POS-OC3SMI

1-port POS OC-3 (STM-3c,STM-1/SDH) single-mode, intermediate reach port adapter

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

PA-POS-OC3MM

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

Cisco uBR7200 series routers

Cisco IOS Release 12.0(6)SC

Dynamic Packet Transport (DPT)

PA-SRP-OC12SML

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

Cisco uBR7246, uBR7246 VXR

Cisco IOS Release 12.0(7)SC and later 12.0 SC releases

PA -SRP-OC12SMI

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

Cisco uBR7246, uBR7246 VXR

Cisco IOS Release 12.0(7)SC and later 12.0 SC releases

PA -SRP-OC12MM

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

Cisco uBR7246, uBR7246 VXR

Cisco IOS Release 12.0(7)SC and later 12.0 SC releases

Serial

PA-4T+

4-port synchronous serial port adapter

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-8T-232

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

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-8T-V35

8-port V.35 synchronous serial port adapter

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-8T-X21

8-port X.21 synchronous serial port adapter

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-4E1G/75

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

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-4E1G/120

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

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-E3

1-port E3 serial port adapter

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-T3

1-port T3 serial port adapter

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-2E3

2-port E3 serial port adapter

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-2T3

2-port T3 serial port adapter

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-MC-E3

1 multichannel E3, medium-speed serial interface

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-MC-T3

1 multichannel T3 interface with BNC connectors

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-MC-4T1

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

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-MC-8T1

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

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

PA-MC-8E1/120

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

Cisco uBR7223, uBR7246

Cisco IOS Release 12.0(6)SC

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 the Software Version

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(8)SC1, RELEASE SOFTWARE

Upgrading to a New Software Release

For information on upgrading to a new software release, see the Cisco IOS Software Release  12.0S Ordering Procedures 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.)

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 only the cable-specific features and feature sets, with the exception of MIBs, supported by the Cisco uBR7200 series in Cisco IOS Release 12.0 SC 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: Cable-Specific Feature List by Feature Sets for Cisco uBR7200 Series Universal Broadband Routers
Feature Feature Set
In1 DOCSIS 2-WAY DOCSIS 2-WAY W/BPI DOCSIS 2-WAY IP+ DOCSIS 2-WAY IP+ W/BPI
IP Routing
Per-Modem Filters

(6)

Yes

Yes

Yes

Yes

Management
Cisco Call History MIB Command-Line Interface

(6)

Yes

Yes

Yes

Yes

Cisco IOS Internationalization

(6)

Yes

Yes

Yes

Yes

Entity MIB, Phase 1

(6)

Yes

Yes

Yes

Yes

MIB Enhancements

(6)

Yes

Yes

Yes

Yes

SNMPv2C and SNMPv3

(6)

Yes

Yes

Yes

Yes

Quality of Service
Downstream QoS Handling

(6)

Yes

Yes

Yes

Yes

Downstream Traffic Shaping

(6)

Yes

Yes

Yes

Yes

Upstream Traffic Shaping

(6)

Yes

Yes

Yes

Yes

Improved Upstream QoS

(6)

Yes

Yes

Yes

Yes

QoS Configuration

(6)

Yes

Yes

Yes

Yes

QoS Profile Enforcement

(6)

Yes

Yes

Yes

Yes

Security
Baseline Privacy Interface (BPI) Encryption

(6)

No

Yes

No

Yes

Per-Modem and Per-Host Access List Support

(6)

Yes

Yes

Yes

Yes

1This column indicates the maintenance release in which the feature was introduced. For example, (6) means a feature is introduced in 12.0(6)SC, and (7) means a feature was introduced in 12.0(7)SC. 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 SC. For a complete list of hardware and software features, listed by the release in which they first appeared, see Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.0 T.

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.

No New Hardware Features in Release 12.0(8)SC1

There are no new hardware features supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(8)SC1.

No New Software Features in Release 12.0(8)SC1

There are no new software features supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(8)SC1.

New Hardware Features in Release 12.0(8)SC

The following new hardware features are supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(8)SC.

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:

New Software Features in Release 12.0(8)SC

The following new software features are supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(8)SC.

Cable Interface Bundling

Cable interface bundling allows a service provider to share one IP subnet across multiple cable interfaces that are grouped into a cable interface bundle. All of the cable interfaces on a Cisco uBR7200 series universal broadband router can be grouped into a single bundle so that only one subnet is required for each router. This eliminates the requirement that a separate IP subnet be used for each individual cable interface. This in turn avoids the performance, memory, and security problems that would result if a bridging solution were used to manage the subnets, especially for a large number of subscribers.

Two new Cisco IOS interface commands implement this feature:

New Hardware Features in Release 12.0(7)SC

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

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)SC or later images support 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 Cisco IOS Releases 12.0(7)SC or later SC images. 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 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. The DPT port adapter requires Cisco IOS Release 12.0(7)SC or later SC releases.

Cisco uBR7246 VXR Chassis

Cisco IOS Release 12.0(7)SC or later images support the Cisco 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, and the NPE-150 and NPE-200 processor cards.

No New Software Features in Release 12.0(7)SC

There are no new software features supported by the Cisco uBR7200 series in Cisco IOS Release 12.0(7)SC.

New Hardware Features in Release 12.0(6)SC

The following new cable modem cards are supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(6)SC.

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 Protocol Control Information (PCI) interface, the universal broadband router line card software interacts with the cable modem card. Data is passed back and forth, as direct memory access (DMA) transfers, from the Cisco uBR7200's memory to the cable modem card.

Additionally, the MC12C and MC14C cable modem cards support universal broadband router line card management and control with the modem card Management Information Bases (MIBs), Media Access Control (MAC) control software, and logical link management software based on DOCSIS standards.

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.

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 Protocol Control Information (PCI) interface, the universal broadband router line card software interacts with the MC16C cable modem card. Data is passed back and forth, as direct memory access (DMA) transfers, from the Cisco uBR7200's memory to the MC16C cable modem card.

Additionally, the MC16C cable modem card supports line card management and control with the MC16C MIB, Media Access Control (MAC) software, and logical link management software based on DOCSIS standards.

New Software Features in Release 12.0(6)SC

The following new software features are supported by the Cisco uBR7200 series routers in Cisco IOS Release 12.0(6)SC.

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.

Additional or Changed Show Commands

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

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.

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-based 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.

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 Type of Service (ToS) bits in the IP packet header can be set to specify that packet's class of service, allowing packets for certain traffic flows to be given precedence over packets for other flows.

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.

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:

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.

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 introduced in Cisco IOS Release 12.0(6)SC. 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.

Cisco IOS SNMPv3

Cisco IOS Release 12.0(6)SC 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.

Generic MIBs

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.

Limitations and Restrictions

Cisco IOS Release 12.0(8)SC1 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

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 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

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.

Important Notes

The following sections contain important notes about Cisco IOS Release 12.0(8)SC1 that apply to Cisco uBR7200 series universal broadband routers.

10-dB Attenuator with Current Modem Cards

The MC11C, MC12C, MC14C, MC16C, and MC16E 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.

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.

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(8)SC1 images.

Supported MIBs

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

The DOCSIS-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.

DOCSIS-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.

12.0(6)SC

SNMPv2-TC.my

SNMPv2-TC-V1SMI.my

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

12.0(6)SC

CISCO-SMI.my

CISCO-SMI-V1SMI.my

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

12.0(6)SC

CISCO-TC.my

CISCO-TC-V1SMI.my

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

12.0(6)SC

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.

12.0(6)SC

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.

12.0(6)SC

CISCO-CABLE-SPECTRUM-MIB.my

CISCO-CABLE-SPECTRUM-MIB-V1SMI.my

This module describes the spectrum management flap-list attributes.

12.0(6)SC

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.

12.0(6)SC

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.

12.0(6)SC

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 Software Releases 11 and 12.0 SC, you must clear the Address Resolution Protocol (ARP) tables after upgrading from Cisco IOS Release 11 to Release 12.0(8)SC1. 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 Cisco uBR7200 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

Caveats describe unexpected behavior in Cisco IOS software releases. 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 2.0 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 II to find caveats of any severity for any release. You can reach Bug Navigator II on CCO at Software Center: Cisco IOS Software: Software Bug Toolkit: Cisco Bug Navigator II or at http://www.cisco.com/support/bugtools.

Open Caveats for Release 12.0(8)SC1

Cisco IOS Release 12.0(8)SC1 includes bug fixes to Release 12.0(8)SC. Those caveats from Release 12.0(8)SC not closed or resolved in Release 12.0(8)SC1 are still open. Please refer to the "Open Caveats for Release 12.0(8)SC" section for details on those caveats not closed or resolved in Release 12.0(8)SC1.

Closed or Resolved Caveats for Release 12.0(8)SC1

All the caveats listed in this section are closed or resolved in Cisco IOS Release 12.0(8)SC1.

When the MAX_CPE field in a cable modem's DOCSIS configuration file was increased and the cable modem rebooted to load the new value, the new value was not recognized by the Cisco uBR7200 series router unless the cable interface servicing that cable modem was cleared by giving the shutdown and no shutdown interface commands.
Possible workarounds were to:
For DOCS-IF-MIB for that cable modem card and all cable modems below it, no workaround existed. This is resolved in Release 12.0(8)SC1.
When a cable modem was moved from one cable interface within a bundle to another interface within the same bundle, it failed to come up. The earlier workaround was to wait at least one hour before bringing up the cable modem on the new interface. This is resolved in Release 12.0(8)SC1.
Issuing the show cable flap-list command at the CLI caused the Cisco uBR7200 series router to crash. A workaround was to avoid the show cable flap-list command. You could reduce the probability of the crash (but not completely eliminate it) by setting the flap-list aging time to a high value---this can be any value between its default value of 10,080 minutes (7 days) or its maximum value of 86,400 minutes (60 days). You can also use the cable flap-list aging 86400 command to set the aging time. This is resolved in Release 12.0(8)SC1.
Previous releases enforced the setting of max-cpe in the uBR7200. This prevented security-breach attempts, where a single user could consume all available IP addresses. This feature, however, was seen as problematic in the field, since customers could not, for example, change the NIC card in their PC and connect. Therefore, the max-cpe checking in the uBR7200 has been removed.
This is resolved in Release 12.0(8)SC1.
The Cisco uBR7200 series occasionally rebooted itself. A sample error message for a reboot is shown below :
router1 uptime is 3 days, 8 hours, 34 minutes System returned to ROM by bus error at PC 0x60276FFC, address 0x80000D at 20:19:54 GMT Thu Jan 20 2000 System restarted at 20:21:27 GMT Thu Jan 20 2000 System image file is "slot0:ubr7200-k1ps-mz.120-8.SC.bin" 
 
0x60276FFC:cmts_delete_sid_state(0x60276fa8)+0x54
For earlier releases, it was necessary to issue the show context command. The output of this command reveals the context of the most recent crash. This is resolved in Release 12.0(8)SC1.
Cable modems can exist on multiple interfaces. Under certain circumstances, when a cable modem supporting bundling is moved from one interface to another, conditions in timing resulted in a loss of connectivity sometimes.
Workaround was to disconnect the cable to the cable modem, and clear the cable modem status using a clear cable modem mac-address reset before moving it to another interface. This is resolved in Release 12.0(8)SC1.

Open Caveats for Release 12.0(8)SC

All the caveats listed in this section are open in Cisco IOS Release 12.0(8)SC.

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 VXR 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.)
If the show controller command is entered during online insertion and removal (OIR) of a cable modem 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 a Cisco uBR7200 series universal broadband router (as well as a Cisco 7200 series router) is first being configured or 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.

Closed or Resolved Caveats for Release 12.0(8)SC

All the caveats listed in this section are closed or resolved in Cisco IOS Release 12.0(8)SC.

Using earlier SC software releases, later versions of Smart Modular and Sharp Flash memory cards used to store Diagnostics and Cisco IOS software images reported unrecoverable write errors in some instances. The affected Flash cards used a Sharp (LH28F016SCT) chip set.
Using Cisco IOS Release 12.0(8)SC, flash code has been updated so as not to access status registers that are not supported with later versions of flash cards. This is resolved in Cisco IOS Release 12.0(8)SC.
Release Notes for Cisco IOS Release 12.0(7)SC reported that 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. The difference in CPU utilization was thought to be due to the overhead of maintaining the cable interface, as required by DOCSIS specifications.
This caveat is closed in Cisco IOS Release 12.0(8)SC. Comparison tests revealed the actual throughput between the Cisco uBR7200 series router and the Cisco 7200 series router is not very different.
Using earlier releases, a cable modem transmitting data with an odd MAC header length had its DHCP requests filtered out, causing the cable modem to be stuck in an initialization state. Cable modems from at least two different vendors were known to be affected by this problem.
This is resolved in Cisco IOS Release 12.0(8)SC.
In Cisco IOS Release 12.0(6)SC, the following error messages were reported on the console when an SNMP query was made for the docsIfSigQSignalNoise attribute for an MC16C cable modem card:
%UBR7200-3-SPIERRNRD: SPI PENDING NO READ DATA
%UBR7200-3-SPIERRRBS: SPI BUS READ 0x02 BYTES SHORT
%UBR7200-3-SPIERRW: SPI PENDING WRITE ERROR
You can disregard these messages since they do not denote a real problem. The messages no longer appear using Cisco IOS Release 12.0(8)SC.
This caveat included the following issues:
Using Cisco IOS Release 12.0(8)SC, code was updated to add protection against bad class of service information and protect the cable modem from misconfiguration scenarios.
The DOCS-IF-MIB has been updated to the RFC2670 DOCS-IF-MIB. Changes were made to the docsIfBaseObjects, docsIfCmObjects, docsIfCmStatusTable, DocsIfCmServiceTable, docsIfCmtsObjects, docsIfCmtsServiceTable, and the docsIfCmtsQosProfilePermissions. A new docsIfCmtsMacToCmTable was added in Cisco IOS Release 12.0(8)SC.
In earlier releases, error messages neglected to isolate problems to specific cable modem cards and slots in certain scenarios. This is corrected in Cisco IOS Release 12.0(8)SC per the example below:
%UBR7200-3-SPIERRW (Cable5/0): SPI PENDING WRITE ERROR:
The show int cx/0 sid connectivity command now shows the correct time or date in the online field. This command shows the hour the cable modem came online (if it came online less than 24 hours after starting the system) or the date the cable modem came online (if it came online more than 24 hours after starting the system).
In earlier releases, when multiple DHCP servers with different IP addresses were configured on a cable interface, the show cable modem command sometimes showed a different IP address than the one used for that particular cable modem. The workaround in earlier releases was to use a single DHCP server to address that cable modem. This is resolved in Cisco IOS Release 12.0(8)SC.
If a modulation profile did not have all the bursts configured (Request, Initial, Station, Short, Long) in earlier releases, the cable modem might not come up after the upstream was reinitialized. This is resolved in Cisco IOS Release 12.0(8)SC.
In the 12.0(7)SC Release Note, it was mentioned that dual-port Fast Ethernet port adapters reported a high input error rate when the traffic reached 90,000 packets per second (kpps) or greater on a Cisco uBR7200 series router. It was noted that this did not occur on single-port Fast Ethernet port adapters. This caveat was rejected and is closed.
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 card providing the downstream interface for that cable modem. In earlier releases, this IP address might not have matched the source address specified by the cable modem in its original request packet (as could be the case in a unicast or forwarded packet). In this instance, certain cable modems rejected the ToD reply. This is resolved in Cisco IOS Release 12.0(8)SC.
The following attributes in the CISCO-CABLE-SPECTRUM-MIB enterprise MIB did not operate as described in the MIB file:
The workaround in earlier releases was to set these attributes using CLI commands.
Using Cisco IOS Release 12.0(8)SC:
Using earlier releases, the show controller cx/y command identified the hardware component; e.g. BCM3210 ASIC; BCM3210 FPGA, instead of the cable modem card version. Using Cisco IOS Release 12.0(8)SC, the show controller cx/y command identifies the specific card version as follows:
Hardware is MC11-FPGA
Hardware is MC11C
Hardware is MC12C
Hardware is MC14C
Hardware is MC16B
Hardware is MC16C
Hardware is MC16E
In earlier releases, if a cable modem was switched between cable interfaces on the Cisco uBR7200 series router, an SNMP query during the switch for a SID on that modem could, in rare situations, generate a "spurious memory access" error message. The workaround in earlier releases was to query the entire docsIfCmtsServiceTable after cdxCmCpeTable, instead of a specific instance. This is resolved in Cisco IOS Release 12.0(8)SC.
In earlier releases, when a cable modem card was replaced using online insertion and removal (OIR), an SNMP GET request on the docsIfCmtsObjects attribute might be missing certain MIB information such as upstream and downstream channel information for that card, and all other modem cards beneath its slot. Issuing an snmpwalk command on docsIfMibObjects might appear to pause indefinitely. The workaround in earlier releases was to reload the router after replacing a modem card using OIR. This is resolved in Cisco IOS Release 12.0(8)SC.
In earlier releases, issuing the show cable flap-list command while baseline privacy was active could result in a crash. This is resolved in Cisco IOS Release 12.0(8)SC.
In earlier releases, problems existed when baseline privacy interface (BPI) was active. The cable source-verify dhcp command did not function properly when BPI was active. This is resolved in Cisco IOS Release 12.0(8)SC.
In earlier releases if the no cable QoS permission modems command was used to disable QoS profile creation by cable modems, all cable modems that had modem-created profiles were reset. Cable modems could not register successfully until the create permissions were re-enabled. This is resolved in Cisco IOS Release 12.0(8)SC.
In earlier releases, the system would sometimes receive a bus error exception when a non-supported cable modem card was swapped with a supported cable modem card. The system would crash during the routine to add sub-interface entry in ifTable. This is resolved in Cisco IOS Release 12.0(8)SC.
In earlier releases involving BPI, the encrypted multicast stopped working when the old key expired and the CMTS switched to use the new key. The traffic was interrupted until another key request came from the cable modem. This is resolved in Cisco IOS Release 12.0(8)SC.

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" 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

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

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: Sat Feb 5 21:39:00 PST 2000
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