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Release  Notes  for  Cisco  uBR7200  Series for Cisco  IOS Release  12.0 XC

Release  Notes  for  Cisco  uBR7200  Series for Cisco  IOS Release  12.0 XC

January 7, 1999

These release notes describe new features for the Cisco  uBR7200 series routers that support Cisco  IOS  Release  12.0(2)XC. Cisco  IOS Release  12.0(2)XC is based on Cisco  IOS Release  12.0 T. These release notes are updated with each maintenance release of the Cisco  IOS software, which is typically every 6 weeks.

Use these release notes in conjunction with the Release  Notes  for  Cisco  IOS  Release  12.0 and Release  Notes  for  Cisco  uBR904  Cable  Modem  for  Cisco  IOS  Release  12.0  XC located on Cisco  Connection Online (CCO)  and the Documentation CD-ROM.  

For a list of software caveats that apply to Release 12.0(2)XC and previous releases, refer to the "Caveats" section. Refer also to the Caveats for Cisco IOS Release 12.0 T located on CCO and the Documentation CD-ROM.

Contents

These release notes discuss the following topics:

Introduction

This section contains information on the Cisco uBR7200 series routers and Early Deployment Releases (ED) for the Cisco uBR7200 series routers.

For information on new features, see the "New Features in Cisco IOS Release 12.0(2)XC1" section.

Cisco Data-over-Cable Products

The Cisco data-over-cable products---the Cisco uBR7223 universal broadband router, the Cisco  uBR7246 universal broadband router, and the Cisco uBR904 cable modem---are compliant with Multimedia Cable Network Partners, Ltd. (MCNS) specifications. MCNS is a consortium of cable television companies whose goal is to create standards for interoperable data over cable systems.

Cisco uBR7223 Universal Broadband Router

The Cisco uBR7223 is a cost-effective, scalable interface between subscriber cable modems and the backbone data network, and is designed specifically for small to medium-sized network installations. The Cisco uBR7223 is based on the Cisco uBR7246.

Cisco uBR7246 Universal Broadband Router

The Cisco uBR7246 is the first of data-over-cable products designed to allow two-way transmission of digital data over hybrid fiber-coaxial (HFC) cable. The Cisco uBR7246 supports Internet Protocol (IP) routing with a wide variety of protocols and any combination of Ethernet, Fast Ethernet, High-Speed Serial Interface (HSSI), and Asynchronous Transfer Mode (ATM) media. The Cisco  uBR7246 universal broadband router gives cable operators a cost-effective, scalable, and feature-rich interface between subscriber cable modems and the backbone data network.

Cisco uBR904 Cable Modem

The Cisco uBR904 cable modem is the subscriber unit, a key component within a cable data system. This subscriber unit functions as an interface between the subscriber's personal computer and the cable operator's network within the subscriber's small office or home office.

For more information on Cisco uBR904, refer to the "Related Documentation" section.

Early Deployment Releases

This release notes document is based on the Cisco uBR7246 for Cisco IOS Release 12.0(2)XC. Release  12.0  XC is an Early Deployment (ED) release, delivering both fixes to software caveats and support for new Cisco hardware. The following table briefly describes some of the ED releases that will be available for the Cisco uBR7200 series.


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

Release 12.0 XC

2

N/A

· MC16A Modem Card

· MC16B Modem Card

· MC16C Modem Card

Now

Release 12.0 T

2

N/A

· Cisco uBR7223

Now

Release 11.3 NA

7

· MCNS Two-way with VPN/NAT

· MCNS Two-way with Baseline Privacy

· MCNS Two-way with Baseline Privacy and VPN/NAT

· MC16A Modem Card

· MC16B Modem Card

· MC16C Modem Card

· Cisco uBR7223

Now

Release 11.3 T

7

N/A

· Cisco uBR7223

Now

System Requirements

This section describes the system requirements for Release 12.0(2)XC and includes the following sections:

Memory Requirements

Table  2 describes the memory requirements for the Cisco  uBR7200 for Release  12.0 XC. Cisco  uBR7246 universal broadband routers are shipped with a 16- or 20-MB Flash memory card.


Table 2: Memory Requirements for the Cisco  uBR7200 Series
Feature Set Image Name Required
Flash
Memory
Required
DRAM
Memory
Runs
From
Feature
Status
IP Routing Standard Feature Sets

MCNS Two-way

ubr7200-p-mz

16 MB Flash

32 MB DRAM

RAM

Added in Release  12.0 T

MCNS Two-way with VPN/NAT

ubr7200-ps-mz

16 MB Flash

32 MB DRAM

RAM

Added in Release  12.0(2)XC

MCNS Two-way with Baseline Privacy

ubr7200-klp-mz

16 MB Flash

32 MB DRAM

RAM

Encryption image added in Release  12.0(2)XC

MCNS Two-way with Baseline Privacy and VPN/NAT

ubr7200-klps-mz

16 MB Flash

32 MB DRAM

RAM

Encryption image added in Release  12.0(2)XC

Hardware Supported

Cisco IOS Release 12.0(2)XC supports the Cisco uBR7200 universal broadband routers:

For detailed descriptions of the new hardware features refer to the "New and Changed Information" section.

Cisco IOS Release 12.0(2)XC also supports the available MC11 and MC16 cable line cards:

For more information on the MC11 and MC16 cable line card software, refer to the "New and Changed Information" section.

Table 3 summarizes the hardware supported on the Cisco  uBR7246 universal broadband router.


Table 3: Supported Interfaces on the Cisco uBR7200 Series

Interface, Network Module, or Data Rate

Product Number1

Description

Platforms Supported

Ethernet

PA-4E

4-port Ethernet 10BaseT port adapter

Cisco uBR7200 series

PA-8E

8-port Ethernet 10BaseT port adapter

Cisco uBR7200 series

PA-FE-TX

1-port 100BaseTX Fast Ethernet port adapter

Cisco uBR7200 series

PA-FE-FX

1-port 100BaseFX Fast Ethernet port adapter

Cisco uBR7200 series

Serial

PA-4T+

4-port synchronous serial port adapter

Cisco uBR7200 series

PA-8T-232

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

Cisco uBR7200 series

PA-8T-V35

8-port V.35 synchronous serial port adapter

Cisco uBR7200 series

PA-8T-X21

8-port X.21 synchronous serial port adapter

Cisco uBR7200 series

PA-4E1G-75

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

Cisco uBR7200 series

PA-4E1G-120

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

Cisco uBR7200 series

High Speed Serial Interfaces (HSSI)

PA-H

1-port HSSI port adapter

Cisco uBR7200 series

ATM

PA-A1-OC3SMI

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

Cisco uBR7200 series

PA-A1-OC3MM

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

Cisco uBR7200 series

PA-A2-4E1XC-OC3SM

5-port ATM CES2 (4 E1 120-ohm CBR3 ports and 1 OC-3 ATM single-mode port) port  adapter

Cisco uBR7246 only

PA-A2-4E1XC-E3ATM

5-port ATM CES2 (4 E1 120-ohm CBR3 ports and 1 E3 ATM port) port adapter

Cisco uBR7246 only

PA-A2-4T1C-OC3SM

5-port ATM CES2 (4 T1 CBR3 ports and 1 OC-3 ATM single-mode port) port adapter

Cisco uBR7246 only

PA-A2-4T1C-T3ATM

5-port ATM CES2 (4 T1 CBR3 ports and 1 T3 ATM port) port adapter

Cisco uBR7246 only

Packet-Over-SONET (POS)

PA-POS-OC3SML

1-port POS OC-3 single-mode, long reach port adapter

Cisco uBR7200 series

PA-POS-OC3SMI

1-port OC3 single-mode, intermediate reach port adapter

Cisco uBR7200 series

PA-POS-OC3MM

1-port POS OC3 multimode port adapter

Cisco uBR7200 series

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.
2CES = circuit emulation services.
3
CBR = constant bit rate.

Determining Your Cisco IOS Software Release

To determine the version of Cisco  IOS software currently running on the Cisco  uBR7200 series router, log into the router and use the show version EXEC command. The following is sample output from the show version command. The version number is indicated on the second line as shown below:

Cisco Internetwork Operating System Software 
IOS (tm) uBR7200 Software (ubr7200-p-mz), Version 12.0(2)XC, RELEASE SOFTWARE
 

Additional command output lines include more information, such as processor revision numbers, memory amounts, hardware IDs, and partition information.

Upgrading to a New Release

At the time of this printing, no product bulletins are available for upgrading to Cisco IOS Release  12.0 XC. For generic information about upgrading to a new software release, refer to the Cisco IOS Software Release Upgrade Paths and Packaging Simplification product bulletin located on CCO. On CCO, follow this path:

Products & Ordering: More Information: Product Bulletins

Scroll to Software. Under Cisco IOS 11.3, click Cisco IOS Software Release 11.3 Upgrade Paths (#703: 12/97). The Cisco IOS Software Release Upgrade Paths and Packaging Simplification product bulletin does not contain information specific to Cisco IOS Release 12.0 XC, but provides generic upgrade information that might apply to Cisco IOS Release 12.0 XC.

Feature Set Tables

The Cisco  IOS software is packaged in feature sets (also called software images) depending on the platform. Each feature set contains a specific set of Cisco IOS features. The following section lists the feature set matrix and the features supported by each feature set.

Table 4 lists the Cisco  IOS software feature sets available for the Cisco  uBR7200 in Cisco  IOS Release  12.0(2)XC. Table  4 lists the feature set name, the software image name, the platform, and whether the feature set is available with additional functionality.


Table 4: Feature Sets Supported by Cisco  uBR7200 Series
Feature Set Feature Set Matrix Term Software Image
IP Routing Standard Feature Sets

MCNS Two-way

Basic1

ubr7200-p-mz

MCNS Two-way with VPN/NAT

Basic, VPN/NAT2

ubr7200-ps-mz

MCNS Two-way with Baseline Privacy

Basic, Baseline Privacy3

ubr7200-klp-mz

MCNS Two-way with Baseline Privacy and VPN/NAT

Basic, Baseline Privacy, VPN/NAT

ubr7200-klps-mz

1This feature is offered in the Basic feature set.
2This feature is offered with VPN/NAT functionality.
3This feature is offered in the encryption feature sets which consist of 56bit DES (k1) data encryption feature sets.

Caution Cisco IOS images with strong encryption (including, but not limited to, 56-bit data encryption feature sets) are subject to U.S. government export controls, and have a limited distribution. Images to be installed outside the U.S. require an export license. Customer orders might be denied or subject to delay due to U.S. government regulations. Contact your sales representative or distributor for more information, or send e-mail to export@cisco.com.

Table 5 lists the features and feature sets supported by the Cisco IOS Release 12.0(2)XC for the Cisco  uBR7200. This tables uses the following conventions to identify features:


Table 5: Feature List by Feature Set for the Cisco  uBR7200 Series
Feature In1 MCNS Two-way MCNS Two-way with VPN/NAT MCNS Two-way with Baseline Privacy MCNS Two-way with Baseline Privacy and VPN/NAT
Internet

DRP Server Agent

(3)

Yes

Yes

Yes

Yes

IP Routing

Easy IP (Phase 1)

(3)

Yes

Yes

Yes

Yes

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

(3)

Yes

Yes

Yes

Yes

IP Type of Service and Precedence for GRE Tunnels

(4)

Yes

Yes

Yes

Yes

IP Enhanced IGRP Route Authentication

(3)

Yes

Yes

Yes

Yes

TCP Enhancements, including:

  • TCP Selective Acknowledgment

  • TCP Timestamp

(3)

No

No

No

No

LAN Support

AppleTalk Access List Enhancements

No

No

No

No

DECnet Accounting

No

No

No

No

IPX Named Access Lists

No

No

No

No

IPX SAP-after-RIP

No

No

No

No

NLSP Enhancements

No

No

No

No

NLSP Multicast Support

No

No

No

No

Management

Improved and Extended Command Line Interface, including:

  • Additional or Changed Show Commands

  • Burst Profile Configuration

  • DHCP Relay Subscriber ID Insertion

  • Improved MAC Scheduler

  • Improved Parameter Configuration

(5)NA

No

Yes

Yes

Yes

Cisco Call History MIB Command Line Interface

(3)

Yes

Yes

Yes

Yes

Cisco IOS Internationalization

(3)

Yes

Yes

Yes

Yes

Entity MIB, Phase 1

(3)

Yes

Yes

Yes

Yes

MIB Enhancements

(5)NA

No

Yes

Yes

Yes

SNMPv2C

(3)

Yes

Yes

Yes

Yes

Spectrum Management Enhancements

Virtual Profiles

(3)

Yes

Yes

Yes

Yes

Multimedia

IP Multicast Load Splitting across Equal-Cost Paths

(3)

Yes

Yes

Yes

Yes

IP Multicast over ATM Point-to-Multipoint Virtual Circuits

(3)

Yes

Yes

Yes

Yes

IP Multicast over Token Ring LANs

(3)

Yes

Yes

Yes

Yes

Stub IP Multicast Routing

(3)

Yes

Yes

Yes

Yes

Quality of Service

Downstream QoS Handling

(5)NA

No

Yes

Yes

Yes

QoS Configuration

(5)NA

No

Yes

Yes

Yes

Read/Create Implementation of QoS

(5)NA

No

Yes

Yes

Yes

RTP Header Compression

(3)

Yes

Yes

Yes

Yes

Improved Upstream QoS

(5)NA

No

Yes

Yes

Yes

Security

Automated Double Authentication

(3)

Yes

Yes

Yes

Yes

Cable Modem and Multicast Authentication using RADIUS

(5)NA

No

Yes

Yes

Yes

Encrypted Baseline Privacy Key Exchange

(5)NA

No

Yes

Yes

Yes

Security

Encrypted Kerberized Telnet

No

No

No

No

HTTP Security

(3)

Yes

Yes

Yes

Yes

Named Method Lists for AAA Authorization & Accounting

(3)

Yes

Yes

Yes

Yes

Per-User Configuration

(3)

Yes

Yes

Yes

Yes

Reflexive Access Lists

(3)

Yes

Yes

Yes

Yes

TCP Intercept

No

No

No

No

Vendor-Proprietary RADIUS Attributes

(3)

Yes

Yes

Yes

Yes

Switching

AppleTalk Routing over ISL and IEEE 802.10 in Virtual LANs

No

No

No

CLNS and DECnet Fast Switching over PPP

No

No

No

No

DECnet/Vines/XNS over ISL, including:

  • Banyan VINES Routing over ISL Virtual LANs

  • DECnet Routing over ISL Virtual LANs

  • XNS Routing over ISL Virtual LANs

No

No

No

No

Fast-Switched Policy Routing

(3)

Yes

Yes

Yes

Yes

IPX Routing over ISL Virtual LANs

No

No

No

No

VIP Distributed Switching Support for IP Encapsulated in ISL

No

No

No

No

Terminal Services

Virtual Interface Template Service

No

No

No

No

Virtual Templates for Protocol Translation

No

No

No

No

WAN Optimization

ATM MIB Enhancements

No

No

No

No

PAD Enhancements

No

No

No

No

PAD Subaddressing

(3)

Yes

Yes

Yes

Yes

WAN Services

Bandwidth Allocation Control Protocol (BACP)

(3)

Yes

Yes

Yes

Yes

WAN Services (continued)

Enhanced Local Management Interface (ELMI)

(3)

Yes

Yes

Yes

Yes

Frame Relay Enhancements

(3)

Yes

Yes

Yes

Yes

Frame Relay MIB Extensions

(3)

Yes

Yes

Yes

Yes

Frame Relay Router ForeSight

(3)

Yes

Yes

Yes

Yes

ISDN Advice of Charge

Yes

Yes

Yes

Yes

ISDN Caller ID Callback

Yes

Yes

Yes

Yes

ISDN Multiple Switch Type

Yes

Yes

Yes

Yes

ISDN NFAS

Yes

Yes

Yes

Yes

LANE Per-subinterface Debug Messages

No

No

No

No

Layer 2 Forwarding---Fast Switching

No

No

No

No

Leased-Line ISDN at 128 kbps

No

No

No

No

MPPC

Yes

Yes

Yes

Yes

Multilink PPP Interleaving and Fair-Queuing Support

No

No

No

No

National ISDN Switch Types for BRI and PRI

(3)

Yes

Yes

Yes

Yes

PPP over ATM

No

No

No

No

Telnet Extensions for Dialout

No

No

No

No

VPDN MIB and Syslog facility

(3)

Yes

Yes

Yes

Yes

VPDN Tunnel Lookup Based on Dialed Number Information

No

No

No

No

X.25 Enhancements

Yes

Yes

Yes

Yes

X.25 on ISDN

No

No

No

No

X.25 Switching between PVCs and SVCs

(3)

Yes

Yes

Yes

Yes

X.28 Emulation

No

No

No

No

1This column indicates the maintenance release in which the feature was introduced. For example, (3) means a feature is introduced in 11.3(3)T and a (2) means a feature was introduced in 12.0(2)XC. If this cell is empty in this column, this feature was introduced in the initial base release.

Optional feature set licenses for the Cisco uBR7246 universal broadband router are as follows:

New and Changed Information

The following sections list the new features supported by the Cisco  uBR7246 universal broadband router in Cisco IOS Release 12.0 XC.

New Features in Cisco  IOS Release  12.0(2)XC

The following hardware enhancements were introduced in Cisco IOS Release 12.0(2)XC and are available for the Cisco uBR7200 series router.

For more information refer to the Release Notes for Cisco IOS Release 12.0.

Cisco uBR7246 Universal Broadband Router

Cisco uBR7246 universal broadband features  enable the Cisco uBR7200 universal broadband router to communicate with a hybrid fiber-coaxial (HFC) cable network via a Cisco MC11 cable modem card. Cisco MC11 cable modem cards allow you to connect cable modems on the HFC network to a Cisco uBR7246 in a Community Antenna Television (CATV) headend facility. The modem card provides the interface between the Cisco uBR7246 protocol control information (PCI) bus and the radio frequency (RF) signal on the HFC network.

Cisco uBR7223 Universal Broadband Router

The Cisco uBR7223 is part of a new class of Cisco data-over-cable products designed to allow two-way transmission of digital data over hybrid fiber-coaxial (HFC) cable. The Cisco uBR7223 supports IP routing with a wide variety of protocols and any combination of Ethernet, Fast Ethernet, High-Speed Serial Interface (HSSI), serial, Packet-Over-SONET (POS), and Asynchronous Transfer Mode (ATM) media.

Cable Router Line Card (MC16)

The Cable Router Line Card (MC16) is available for the Cisco  uBR7200. The software for the MC16 card is a driver running on the Cisco  uBR7246. Using a PCI interface, the universal broadband router line card software interacts with the MC16 card. Data is passed back and forth, as direct memory access (DMA) transfers, from the Cisco  uBR7246 memory to the MC16 card.

Additionally, the MC16 card supports universal broadband router line card management and control with the MC16 MIB, MAC control software and logical link management software based on MCNS standards, and minimized security.

For more information refer to the Update to the Cisco uBR7200 Series Cable Modem Card Installation and Configuration for the MC16A EFT Card publication.

Important Notes

This section contains important information about use of your Cisco IOS Release 12.0 XC software.

Deprecated MIBs

Older Cisco Management Information Bases (MIBs) will be replaced in a future release. OLD-CISCO-* MIBS are currently being migrated into more scalable MIBs, without affecting existing Cisco IOS products or NMS applications. Application developers should update from deprecated MIBs to the replacement MIBs as shown in the table below.


Table 6: Deprecated MIBs
Deprecated MIB Replacement

OLD-CISCO-APPLETALK-MIB

RFC1243-MIB

OLD-CISCO-CHASSIS-MIB

ENTITY-MIB

OLD-CISCO-CPUK-MIB

In Development

OLD-CISCO-DECNET-MIB

OLD-CISCO-ENV-MIB

CISCO-ENVMON-MIB

OLD-CISCO-FLASH-MIB

CISCO-FLASH-MIB

OLD-CISCO-INTERFACES-MIB

IF-MIB CISCO-QUEUE-MIB

OLD-CISCO-IP-MIB

OLD-CISCO-MEMORY-MIB

CISCO-MEMORY-POOL-MIB

OLD-CISCO-NOVELL-MIB

NOVELL-IPX-MIB

OLD-CISCO-SYS-MIB

(Compilation of other OLD* MIBS)

OLD-CISCO-SYSTEM-MIB

CISCO-CONFIG-COPY-MIB

OLD-CISCO-TCP-MIB

CISCO-TCP-MIB

OLD-CISCO-TS-MIB

OLD-CISCO-VINES-MIB

CISCO-VINES-MIB

OLD-CISCO-XNS-MIB

Caveats

This section contains a detailed list of the open and resolved caveats affecting Cisco IOS Release 12.0(2) XC only. For information on other caveats that also apply to this release, refer to the Caveats for Cisco IOS Release 12.0 T document and the Cross-Platform Release Notes for Cisco IOS Release 12.0 document located on CCO and the Documentation CD-ROM.


Note If you have an account with CCO, you can use Bug Navigator II to find caveats of any severity for any release. Bug Navigator II can be found at http://www.cisco.com/support/bugtools, or from CCO, select Software & Support: Tools: Bug Toolkit II.

Open Caveats---Release 12.0(2)XC

This section describes possibly unexpected behavior by Release 12.0(2)XC. This section describes only severity 1 and 2 caveats.

Miscellaneous

Description: If a User Datagram Protocol (UDP) packet with an invalid length is sent to port 514 (the "syslog" port) on an IOS device, the device is likely to reload. In this situation, a stack trace might not be saved. Such packets are sent by the popular nmap port scanning program.

Workaround: You can work around this vulnerability by preventing any affected Cisco IOS device from receiving or processing UDP datagrams addressed to its port 514. This can be done either using packet filtering on surrounding devices, or by using input access list filtering on the affected IOS device itself.

If you use an input access list, that list should be applied to all interfaces to which attackers may be able to send datagrams. This includes not only physical LAN and WAN interfaces, but virtual subinterfaces of those physical interfaces, as well as virtual interfaces and/or interface templates corresponding to GRE, L2TP, L2F, and other tunnelling protocols.

The input access list must block traffic destined for any of the CiscoIOS device's own IP addresses, as well as for any broadcast or multicast addresses on which the Cisco IOS device may be listening. It's important to remember to block old-style "all-zeroes" broadcasts as well as new-style "all-ones" broadcasts.

There is no single input access list that will work in all configurations. It is very important that you understand the effect of your access list in your specific configuration before you activate the list.

The following example shows a possible access list for a three-interface router, along with the configuration commands needed to apply that access list. The example assumes no need for input filtering other than as a workaround for this vulnerability.

! Deny all multicasts, and all unspecified-net broadcasts, to port 514 
access-list 101 deny udp any 224.0.0.0 31.255.255.255 eq 514
! Deny old-style unspecified-net broadcasts
access-list 101 deny udp any host 0.0.0.0 eq 514
! Deny network-specific broadcasts. This example assumes that all of
! the local interfaces are on the class B network 172.16.0.0, subnetted
! everywhere with mask 255.255.255.0. This will differ from network
! to network. Note that we block both new-style and old-style broadcasts.
access-list 101 deny udp any 172.16.0.255 0.0.255.0 eq 514
access-list 101 deny udp any 172.16.0.0   0.0.255.0 eq 514
! Deny packets sent to the addresses of our own network interfaces.
access-list 101 deny udp any host 172.16.1.1 eq 514
access-list 101 deny udp any host 172.16.2.1 eq 514
access-list 101 deny udp any host 172.16.3.3 eq 514
! Permit all other traffic (default would be to deny)
access-list 101 permit ip any any

! Apply the access list to the input side of each interface
interface ethernet 0
ip address 172.16.1.1 255.255.255.0
ip access-group 101 in

interface ethernet 2
ip address 172.16.2.1 255.255.255.0
ip access-group 101 in

interface ethernet 3
ip address 172.16.3.3 255.255.255.0
ip access-group 101 in

It can be complicated to list all possible addresses, and especially all possible broadcast addresses, to which attack packets might be sent. If you do not expect to receive any legitimate syslog traffic on an interface, you may wish to simply block all syslog traffic arriving on that interface. Remember that this will affect traffic routed through the Cisco IOS device as well as traffic destined to the device.

Input access lists have an impact on system performance, and should be installed with a degree of caution, especially on systems that are running very near their capacity limits.

Description: When you configure Bisync (encapsulation bstun) with the ASCII character set (bsc char-set ascii) on the first port of a serial WIC (1T, 2T, or 2A/S) in WIC slot 0 of a Cisco 2600 series router, only the first character of each frame is received, and the BSTUN tunnel is not established. This only affects Bisync mode when it is configured with the ASCII character set. Other encapsulations are not affected, and using the EBCDIC character set with Bisync works correctly.

Details: For the first serial port in WIC slot 0, the parity detection is not configured correctly for Bisync in ASCII mode. The first character of each frame generates a parity error that causes the receiver to discard the frame after the first character received.

Workaround: Use a different serial port: either the second serial port (port 1) on a 2T or 2A/S WIC in WIC slot 0 or any serial port in WIC slot 1. If you have only one serial WIC, moving it from WIC slot 0 to WIC slot 1 fixes this problem.

Resolved Caveats---Release 12.0(2)XC

Because Cisco IOS Release 12.0(2)XC is a limited-time release, only the initial caveats are documented in these release notes.

Related Documentation

The following sections describe the documentation available for the Cisco  uBR7200 series routers. Typically, these documents consist of hardware installation guides, software installation guides, Cisco IOS configuration and command references, system error messages, and feature modules, which are updates to the Cisco IOS documentation. Documentation is available as printed manuals or electronic documents, except for feature modules, which are available online only.

The most up-to-date documentation can be found on the Web via Cisco  Connection Online (CCO)  and the Documentation CD-ROM.  These electronic documents might contain updates and modifications made after the hard copy documents were printed.

These release notes should be used in conjunction with the documents listed in this section.

Release-Specific Documentation

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

To reach the cross-platform Release Notes for Cisco IOS Release 12.0 on CCO, follow this path:

Software & Support: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Release Notes: Cross-Platform Release Notes for Cisco IOS Release  12.0

To reach the cross-platform Release Notes for Cisco IOS Release 12.0 on the Documentation CD-ROM, follow this path:

Cisco IOS Software Configuration: Cisco IOS Release 12.0: Release Notes: Cross-Platform Release Notes for Cisco IOS Release 12.0

To reach these documents, refer to the Software Center at this path on CCO:

Software & Support: Software Center: Cisco IOS Software

As a supplement to the caveats listed in the "Caveats" section in these release notes, see the Caveats for Cisco IOS Release 12.0 T  document, which contains caveats applicable to all platforms for all maintenance releases of Release 12.0 T.
To reach the caveat document on CCO, follow this path:
Products & Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco  IOS Release 12.0: Caveats: Caveats for Cisco IOS Release 12.0 T
To reach the caveat document on the Documentation CD-ROM, follow this path:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS 12.0: Caveats: Caveats for Cisco IOS Release 12.0 T

Feature Modules

Feature modules describe new features supported by Release  12.0, and are an update to the Cisco  IOS documentation set. As updates, the features modules are available online only. The feature module information is included in the next printing of the Cisco IOS documentation set. Each feature module consists of a brief overview of the feature, benefits, configuration tasks, and a command reference.

To reach the feature modules on CCO, follow this path:

Products & Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation: New Features in 12.0-Based Limited Lifetime Releases

To reach the feature modules on the Documentation CD-ROM, follow this path:

Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation: New Features in 12.0-Based Limited Lifetime Releases

Platform-Specific Documents

The documents listed in this section are available for the Cisco uBR7200 series. These documents are also available on CCO and the Documentation CD-ROM.

To reach Cisco uBR7200 and Cisco uBR900 series documentation on CCO, follow this path:

Software & Support: Documentation: Cisco Documentation: Cisco Product Documentation: Broadband/Cable Solutions: Cisco uBR7200 Series Universal Broadband Routers or Cisco  uBR904 Cable Modem

To reach Cisco uBR7200 and Cisco uBR900 series documentation on the Documentation CD-ROM, follow this path:

Broadband/Cable Solutions: Cisco uBR7200 Series Universal Broadband Routers or Cisco  uBR904 Cable Modem

Cisco IOS Software Documents

The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco  IOS command references, and several other supporting documents. These documents are shipped with your order in electronic form on the Documentation CD-ROM, unless you specifically ordered 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. Each configuration guide can be used in conjunction 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.

To reach these documents on CCO, follow this path:

Products & Ordering: Cisco 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

To reach these documents on the Documentation CD-ROM, follow this path:

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 7 details the contents of the Cisco IOS Release 12.0 software documentation set. The document set is available in electronic form, and also in printed form upon request.


Note The most current Cisco IOS documentation can be found on the latest Documentation CD-ROM and on the Web. These electronic documents might contain updates and modifications made after the paper documents were printed.

To reach the Cisco IOS documentation set on CCO, follow this path:

Products & Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides and Command References

To reach the Cisco IOS documentation set on the Documentation CD-ROM, follow this path:

Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides and Command References

.

Table 7: 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 Guide1

  • Quality of Service Solutions Command Reference1

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

1This book will not be available until January 1999.


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

Service and Support

For service and support for a product purchased from a reseller, contact the reseller. Resellers offer a wide variety of Cisco  service and support programs, which are described in the section "Service and Support" in the information packet that 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 TAC Home Page

For helpful tips on configuring Cisco products, follow this path on CCO:

Software & Support: Technical Tips (button on left margin)

"Hot Tips" are popular tips and hints gathered from Cisco's Technical Assistance Center (TAC). Most of these documents are also available from the TAC's Fax-on-Demand service. To reach Fax-on-Demand and receive documents at your fax machine, call 888-50-CISCO (888-502-4726).

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 access 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, which 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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