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Release Notes for Cisco 6200 for
Cisco IOS Release 11.3(1)DA2

Release Notes for Cisco 6200 for
Cisco IOS Release 11.3(1)DA2

August 18, 1998

These release notes discuss features and caveats for the Cisco 6200 advanced digital subscriber line access multiplexer (DSLAM) supported in Cisco IOS Release 11.3(1)DA2.

For more detailed information about the features in these release notes, refer to the "Related Documentation" section. For more information about caveats, see the "Cisco Connection Online" section. Information about electronic documentation can be found in the "Cisco Connection Online" section and in the "Documentation CD-ROM" section.

1. Contents

These release notes discuss the following topics:

2. Determining Your Cisco IOS Software Release

To determine the version of Cisco IOS software running on your system, log on and enter the show version user EXEC command:

c6200> show version

Output begins with the following. The Cisco IOS version appears in the second line.

Cisco Internetwork Operating System Software IOS (tm) C6200 Software (C6200-DCM-M), Version 11.3(1)DA2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) Copyright (c) 1986-1998 by cisco Systems, Inc.

The full output includes additional information, such as processor revision numbers, memory amounts, hardware IDs, and partition information.

3. Important Notes

3.1 Changes to CLI Commands

This release includes the following changes to CLI commands:

Command Description of Change Example

dsl bitrate

Two new downstream bit rates have been added: 3200 and 5120.

c6200(config-if)# dsl bitrate downstream 3200 upstream 1088

dsl lbo

The dsl lbo command has been changed to dsl local-tx-power.

-

dsl local-tx-power

A new command in interface configuration mode allows you to adjust the power of the signal transmitted from the Cisco 6200 to the CPE downstream. To avoid crosstalk, use the lowest power possible to achieve the desired bit rate. The default value is Full. The transmit power values you can use are

  • Full (transmits at the highest power the interface is capable of)

  • minus_3db (transmits at 3 db below full power)

  • minus_6db

  • minus_9db

  • minus_12db

  • minus_15db

c6200(config-if)# dsl local-tx-power minus_3db

dsl remote-tx-power

A new command in interface configuration mode allows you to adjust the power of the signal transmitted from the CPE to the Cisco 6200 upstream. To avoid crosstalk, use the lowest power possible to achieve the desired bit rate. The default value is Full. The transmit power values you can use are

  • Full (transmits at the highest power the interface is capable of)

  • minus_3db (transmits at 3 db below full power)

  • minus_6db

  • minus_9db

  • minus_12db

  • minus_15db

c6200(config-if)# dsl remote-tx-power minus_12db

3.2 Use Firmware Release 1.4.2 on a Cisco 675

It is strongly recommended that you use Firmware Release 1.4.2 for the Cisco 675 (NetSpeed 204). Firmware Release 1.4.2 solves a problem with signal-to-noise ratios (SNRs) that existed in earlier releases of the software.

3.3 Verifying Line Quality

Follow this procedure to verify the quality of a line:


Step 1   Use these commands to enable the port you want to test; slot/port specifies the card's slot number and the port number:

config terminal int dsl slot/port no shut exit exit

Step 2   To determine the rate at which the modems trained, enter the following command:

show dsl interface dsl slot/port

Step 3   In the resulting display, locate the actual bit rates (downstream and upstream) and record them.

Step 4   Reconfigure the port for the rates you recorded. Use these commands:

config terminal int dsl slot/port dsl bitrate downstream bitrate_value upstream bitrate_value exit exit

The port retrains at the new bit rates.

Step 5   Enter this command to run the line test, where minutes is the number of minutes you want the test to run (1 to 60; at least 20 minutes is recommended):

linetest dsl slot/port linequality duration minutes

Step 6   Wait for the line test to complete, and then enter this command to display the results:

show dsl interface dsl slot/port

Step 7   If the line fails the test, repeat Step 4 through Step 6, choosing the next lowest available bit rate. (Enter dsl bitrate downstream ? and dsl bitrate downstream new_bitrate_value upstream ? to display lists of bit rates.)

4. Cisco 6200 DSLAM

The Cisco 6200 DSLAM is a Central Office (CO) grade multiplexer that supports up to 80 ADSL ports (more in future releases). The Cisco 6200 DSLAM sends and receives subscriber data (often Internet service) over existing copper telephone lines, concentrating all traffic onto a single high-speed trunk for transport to the Internet or the enterprise intranet. The Cisco 6200 DSLAM is supported by Cisco IOS software.

5. Interfaces Supported on Cisco 6200 DSLAM

These interfaces are supported on the Cisco 6200 DSLAM under Cisco IOS Release 11.3(1)DA2:

6. New Features for Cisco IOS Release 11.3(1)DA2

There are no new features. This is a maintenance release designed to improve the reliability and performance of the Cisco 6200 DSLAM.

7. New Features for Cisco IOS Release 11.3(1)DA1

The features discussed in the following paragraphs are supported by the Cisco 6200 DSLAM in Cisco IOS Release 11.3(1)DA1.

7.1 Cisco IOS Software

The Cisco 6200 DSLAM runs Cisco's industry-leading IOS software. Cisco IOS software's command line interface (CLI) provides tools for managing the DSLAM. CLI commands support the following functions:

7.2 Element Management Support

For configuration and management of the Cisco 6200 DSLAM, Cisco provides the Cisco 6200 Manager software application, an SNMP-based graphical user interface that runs under Windows NT. The Manager can be used in place of or in addition to the command line management tool provided by Cisco IOS software.

7.3 ATM Circuits Require No Configuration

On the Cisco 6200 DSLAM, ATM permanent virtual channels (PVCs) are statically defined; you do not configure them. Enabling a port enables all associated PVCs.

7.4 Management Processor Card

The management processor card (MPC) performs management and storage tasks for the Cisco 6200 DSLAM. It supports

7.5 One-Port Network Trunk Cards

The STS-3c/OC-3c network trunk cards (NTCs) are available in single-mode and multimode versions. The NTCs concentrate the data traffic from all Cisco 6200 subscriber ports onto a single high-speed trunk to an ATM network. The interface operates at 155 Mbps.

7.6 Eight-Port Subscriber Line Card

Each subscriber line card (SLC) provides eight subscriber ports that support DSL access with rate-adaptive carrierless amplitude modulation/phase modulation (RADSL/CAP) modems. The CAP SLC transports data at speeds up to 7 Mbps downstream and receives up to 1 Mbps upstream. The Cisco 6200 DSLAM supports up to ten SLCs.

8. Caveats for Cisco IOS Release 11.3(1)DA2

This section describes possibly unexpected behavior by Release 11.3(1)DA2. A DDTs tracking number, if one exists, is provided in square brackets at the end of each description. Please refer to the DDTs number if you communicate with Cisco about any of these issues.

8.1 DSL Line Quality Testing

8.2 ATM Loopback Testing

8.3 Modems Train Poorly

Modems train poorly while the phone on the line is ringing. [CSCdk02256]

8.4 Configuring for Optimal Line Throughput

The Cisco 6200 has limited cell buffers. If the upstream switch does not perform traffic shaping, extremely bursty traffic might cause buffers to overflow. As a result, in some cases, packets are dropped and throughput degrades. [CSCdk09616]

Workaround: If subscribers are experiencing poor performance, you might be able to alleviate the problem using the traffic shaping feature on the device upstream from the Cisco 6200 DSLAM. Set the VBR Peak Cell Rate and Sustainable Cell Rate to values in kbps that you are sure can be reliably reached in your environment. (On any line that connects at a rate lower than the rate you specify, packets will be lost and performance could be poor.) We recommend a value no greater than 7000 kbps for both VBR Peak Cell Rate and Sustainable Cell Rate.

This example, an excerpt from a configuration file, shows you how to set traffic shaping on a Cisco 7200 router with an ATM-CES card.

! interface ATM4/0.1 multipoint  pvc 0/176   vbr-nrt 7000 7000  encapsulation aal5ciscoppp Virtual-Template1 ! interface Virtual-Template1  mtu 2048  no ip mroute-cache  no keepalive  no peer default ip address  ppp authentication pap callin !

The key command in the example is vbr-nrt 7000 7000, which breaks down as follows:

vbr-nrt

Virtual bit rate

7000 (first instance)

Peak Cell Rate

7000 (second instance)

Sustainable Cell Rate

8.5 IP Routing Interferes with Communication Among Cards

The Cisco 6200 DSLAM functions as an IP host, not as an IP router. When IP routing is enabled on the MPC, the MPC cannot communicate with the trunk and line cards. Do not turn on IP routing.

8.6 IP Name Server Halts System

The Cisco 6200 system reboots when using the IP name server to resolve a host name (for a Telnet connection, for example). Workaround: Use IP addresses instead of host names. [CSCdk13888]

8.7 Line Test Command Incorrectly Changes SNMP Objects

Running the linetest command on one port changes the SNMP line test type object for other ports. [CSCdk18930]

8.8 Alarm Cutoff Command Does Not Work

The alarmcutoff CLI command does not stop audible alarms on the external alarm connector. Workaround: Use the ACO button on the front panel of the MPC to turn off alarms. [CSCdk22404]

9. Resolved Problems

The bugs listed in Table 1, which were present in Cisco IOS Release 11.3(1)DA1, are fixed in Cisco IOS Release 11.3(1)DA2.


Table 1: Resolved Problems
Bug Number Description

CSCdk03274

The line quality test (an option with the linetest command) failed when the line was overloaded with traffic in the upstream direction. This does not happen if the traffic rate is less than or equal to the xDSL line rate.

CSCdk08345

If you run the CAP hardware test (linetest dsl slot/port caphardware duration 3 berr 10) on a card that has gone down very recently (within 15 seconds or so), no error message is displayed.

CSCdk15261

When you put a DSL port (on the SLC card) into loopback mode, the traffic associated with that port gets looped back from the ATM port as well as from the DSL port. As a result, the ARP table on the upstream link might need to be cleared.

CSCdk13842

Cisco 675 (NetSpeed 204) modems using NetSpeed Firmware software prior to Version 1.4.2 default to a NO_CHANGE_MARGIN configuration. This maximizes the downstream line rate for a given loop length. It does not guarantee a 10-7 error rate over a line that is subjected to impairments such as crosstalk, POTS signaling, and impulse or background noise. For Cisco 675 modems that have not been upgraded to Firmware Version 1.4.2, refer to the release note for Cisco IOS Release 11.3(1)DA1.

CSCdk14841

In the output of the command show dsl interface dsl, incorrect values are displayed for margins.

CSCdk03285

When you enter the command show dsl interface dsl slot/port, "Statistics" counts appear at the end of the resulting display. Sometimes the "VPI,VCI (0, 33) cells" values exceed the "Total cells" values. These values are read from different registers, and the registers are not read simultaneously.

CSCdk14272

PRFI and LRFI should be critical alarms, not major alarms.

10. Related Documentation

Use these release notes in conjunction with the documents listed in this section.

The documents mentioned below can be found on Cisco Connection Online and on the Documentation CD-ROM. For more information, see the "Cisco Connection Online" section and the "Documentation CD-ROM" section. For location details, see the "Online Navigation for Cisco IOS Software Documentation" section.

10.1 Cisco 6200 Documentation

The following Cisco 6200 documents are available:

10.2 Cisco IOS Software Documentation

The Cisco 6200 documentation contains all of the information on Cisco IOS software that you need to configure and manage the Cisco 6200. Cisco does not expect that users of the Cisco 6200 will need to refer to the Cisco IOS software documentation set. However, if you want more information about Cisco IOS commands, refer to the Cisco IOS software documentation set, which is described in this section.

The Cisco IOS software documentation is divided into nine modules and two master indexes. There are also four supporting documents.

10.2.1 Documentation Modules

Each module 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 functions and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Each configuration guide can be used with its corresponding command reference.

10.2.2 Master Indexes

Two master indexes provide indexing information for the Cisco IOS software documentation set: an index for the configuration guides and an index for the command references. In addition, each book has its own index.


Note The most up-to-date Cisco IOS documentation can be found on the Web on Cisco Connection Online and on the Documentation CD-ROM. The electronic documents found there contain updates and modifications made after the paper documents were printed. See the section "Online Navigation for Cisco IOS Software Documentation" for more details.

The Cisco IOS documentation set consists of the following books and chapter topics:

Book Chapter Topic
  • Configuration Fundamentals Configuration Guide

  • Configuration Fundamentals Command Reference

Configuration Fundamentals Overview

Cisco IOS User Interfaces

File Management

Interface Configuration

System Management

  • 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

  • Wide-Area Networking Configuration Guide

  • Wide-Area Networking Command Reference

ATM

Frame Relay

SMDS

X.25 and LAPB

  • Security Configuration Guide

  • Security Command Reference

AAA Security Services

Security Server Protocols

Traffic Filtering

Network Data Encryption

Passwords and Privileges

Neighbor Router Authentication

IP Security Options

  • Dial Solutions Configuration Guide

  • Dial Solutions Command Reference

Dial Business Solutions and Examples

Dial-In Port Setup

DDR and Dial Backup

Remote Node and Terminal Service

Cost-Control and Large-Scale Dial Solutions

VPDN

  • Cisco IOS Switching Services Configuration Guide

  • Cisco IOS Switching Services Command Reference

Switching Paths for IP Networks

Fast Switching

Autonomous Switching

NetFlow Switching

Optimum Switching

Virtual LAN (VLAN) Switching and Routing

Inter-Switch Link Protocol Encapsulation

IEEE 802.10 Encapsulation

LAN Emulation

  • Bridging and IBM Networking Configuration Guide

  • Bridging and IBM Networking Command Reference

Transparent Bridging

Source-Route Bridging

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

NCIA Client/Server Topologies

IBM Channel Attach

  • Cisco IOS Software Command Summary

  • Dial Solutions Quick Configuration Guide

  • System Error Messages

  • Debug Command Reference


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 (CCO). On CCO, go to Software and Support, select Software Center, and click Network Management Products. Next, select Cisco Network Management Toolkit and click Cisco MIBs.

11. Online Navigation for Cisco IOS Software Documentation

You can access the Cisco IOS software electronic documents either on the Cisco Documentation CD-ROM or at Cisco Connection Online (CCO) on the World Wide Web:

The following are some of the Cisco IOS Release 11.3 documents:

For product bulletins on CCO, the path is as follows from Cisco Connection Online:

Products and Ordering: More Information: Product Bulletins. In the Software area, under Cisco IOS 11.3, click Cisco IOS Software Release 11.3 Upgrade Paths.

11.1 Online Navigation Enhancements

Cisco IOS Release 11.3 master indexes for the configuration guides and command references can be accessed on the Documentation CD-ROM or through the CCO (Cisco Connection Online) page of the Cisco web site. The CD-ROM is updated monthly, and can be ordered through CCO. To access the Cisco IOS Release 11.3 master indexes, perform the following steps:


Step 1   Access the Cisco home page at http://www.cisco.com.

Step 2   Select Software and Support.

Step 3   Under the Software Center bullet, select Cisco IOS Software.

Step 4   Under the Additional Information bullet, select Software Configuration. The Cisco IOS Software Configuration page should now be displayed. It lists the current available Cisco IOS releases.

Step 5   Select Cisco IOS Release 11.3, which accesses the Cisco IOS Release 11.3 page. This page lists the various documents available for Release 11.3.

Step 6   Select Cisco IOS 11.3 Configuration Guides, Command References, and then select the particular document index you would like to view.

For additional information about the Documentation on CCO and the CD-ROM, refer to the sections "Cisco Connection Online" and "Documentation CD-ROM" at the end of these release notes.

12. 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.

For the latest information on caveats and known problems, follow these steps to consult CCO:


Step 1   Connect to CCO as directed in the section above.

Step 2   On the CCO home page, click LOGIN, which appears in green in the menu bar at the top of the page, and log into CCO. (If you are not a registered CCO user, follow the instructions to register so that you can log in.)

Step 3   After you log in, click Software & Support on the CCO home page.

Step 4   On the Software & Support page, click Technical Tools.

Step 5   On the Technical Tools page, click Bug Toolkit II. (Bug Toolkit II is not visible on the Technical Tools page unless you log in to CCO as directed in Step 2.)

Step 6   Use one of the tools to get up-to-date bug information. For example, click Search for Bug by ID Number, then enter a bug ID, such as CSCdk09616, when prompted. For instructions on using the bug tools, go to the bottom of the Bug Toolkit II page and click Help—How to Use the Bug Toolkit.

13. 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 through 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 Sep 28 04:35:03 PDT 2002
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