Table of Contents

Contents
Introduction

Cisco AS5800/Voice Gateway

Cisco AS5800 Voice Feature Card

System Requirements

Memory Recommendations
Hardware Supported
Determining the Software Version
Upgrading to a New Software Release
Microcode and Modem Code Software
Feature Set Tables

New and Changed Information
MIBs
Limitations and Restrictions

IP LAN and ISDN Restrictions

Caveats

Closed or Resolved Caveats—Release 12.1(4) AA

Related Documentation

Release-Specific Documents
Platform-Specific Documents
Cisco IOS Software Documentation Set

Documentation Modules
Cisco IOS Release 12.1 Documentation Set

Obtaining Documentation

World Wide Web
Documentation CD-ROM
Ordering Documentation

Obtaining Technical Assistance

Cisco Connection Online
Technical Assistance Center
Software Configuration Tips on the Cisco Technical Assistance Center Home Page
Documentation Feedback

Release Notes for Cisco AS5800 Universal Access Servers for Cisco IOS Release 12.1 AA

September 11, 2000

Note   You can find the most current Cisco IOS documentation on Cisco Connection Online (CCO).  These electronic documents may contain updates and modifications made after the hardcopy documents were printed.

These release notes for Cisco AS5800 universal access servers support Cisco IOS Release 12.1(4)AA. These release notes are updated to describe new memory requirements, hardware support, software platform deferrals, and changes to the microcode or modem code and related documents.

For a list of the software caveats that apply to Cisco IOS Release 12.1 AA, see Caveats for Cisco  IOS Release  12.1 that accompanies these release notes. The caveats document is updated for every maintenance release and is located on Cisco Connection Online (CCO)  and the Documentation CD-ROM.

Use these release notes with Cross-Platform Release Notes for Cisco  IOS Release 12.1 on CCO  and the Documentation CD-ROM.

Contents

These release notes describe the following topics:

• Introduction

• System Requirements

• New and Changed Information

• MIBs

• Limitations and Restrictions

• Caveats

• Related Documentation

• Obtaining Documentation

• Obtaining Technical Assistance

Introduction

The Cisco AS5800 is a high-density, Integrated Services Digital Network (ISDN) and modem Wide Area Network (WAN) aggregation system that provides digital and analog call termination. It is intended to be used as a service provider dial point-of-presence (POP) or centralized enterprise dial gateway. The Cisco AS5800 consists of a dial shelf, a router shelf, and (optionally) a system controller:

• The Cisco DS5814 (dial shelf) has 14 slots and can support 1 or 2 dial shelf controller cards and up to 12 feature cards to provide full analog modem and ISDN coverage. The dial shelf supports up to 1440 simultaneous analog and/or digital calls. Analog calls are terminated by a feature card that is loaded with integrated modems. ISDN calls are terminated onboard the trunk card on High-Level Data Link Control (HDLC) controllers. The E1 trunk, CT3 trunk, and the T1 trunk cards include channel service units (CSUs) and have either 12 E1 ports or 12 T1 ports that can operate as Primary Rate Interface (PRI) interfaces or channelized interfaces in any combination. The CT3 trunk supports 28 T1s. The specific trunk card limitations are described in Table 2, Part 1.

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Note   T1 and E1 cards are not supported in the same box.

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• The Cisco RS7206VXR (router shelf) contains a network processing engine, an I/O controller, and the egress interfaces, such as High-Speed Serial Interface (HSSI), Fast Ethernet (FE), Fiber Distributed Data Interface (FDDI), and Asynchronous Transfer Mode (ATM), and supports either 280W AC-input or 280W DC-input redundant power. The router shelf also may contain one or two dial shelf interconnect port adapters each with a single RJ-45 receptacle, which is used to connect the router shelf to the Cisco 5814 dial shelf. The interconnect port adapter connects directly to the dial shelf controller card on the dial shelf via a Cisco-proprietary cable, customized with jack screws to secure the connection. You must use this specially designed cable that ships with your interconnect port adapter.

• The Cisco SC3640 (system controller) includes the Cisco 3640 router running Cisco IOS system controller software. The system controller can be installed at a remote facility so users can access multiple systems through a console port or Web interface. System administrators can download software configurations to any Cisco AS5800 universal access server using Simple Network Management Protocol (SNMP) or Telnet. The system controller monitors Cisco equipment to provide performance data collection, accounting data collection, and logging.

The AC-input power shelf is an optional component of the Cisco AS5800 and is used to convert AC-input power into DC-output power for the DC-powered Cisco 5814 dial shelf. The AC-input power shelf contains two AC-input power supplies.

The AC-input to DC-output connection supplies -48V DC-output power to the dial shelf power entry modules (PEMs). The PEMs receive the -48V and transmit power to the filter module. Power flows through the filter module to the backplane where it is distributed to the dial shelf controller card(s) and feature cards.

The AC-input power shelf includes two 2,000 W, AC-input power supplies that plug into a common power backplane in the AC-input power shelf. A single AC-input power supply is capable of powering a fully configured Cisco 5814 dial shelf. The second power supply provides full redundancy.

Cisco AS5800/Voice Gateway

The Cisco AS5800/Voice Gateway enables highly scalable deployment of toll-quality voice and fax services over data networks. Enhanced with Cisco's IOS software and Service Node (SN) capabilities, the Cisco AS5800 supports features such as prepaid and postpaid calling card, 800 call redirect, voice activated dialing, and voice and fax mail.

The Cisco AS5800 is specifically designed to meet the demands of large service providers such as Post, Telephone, and Telegraphs (PTTs), regional bell operating companies (RBOCs), inter-exchange carriers (IXCs), and large Internet telephony service providers (ITSPs). The physical architecture of the Cisco AS5800 product enhances reliability, availability, and serviceability. Critical features to dial POP administrators include minimizing downtime, service costs, and time to deployment.

The Cisco AS5800 supports up to 1344 voice ports in a single system, thus offering the highest concentration of VoIP Digital Signal Processors (DSPs) available in a single voice gateway. The Cisco AS5800 offers breakthrough voice quality, density, and scalability, while continuing to provide the rich set of access, VoIP, and QoS services that are part of Cisco IOS software.

Cisco AS5800 Voice Feature Card

The Cisco AS5800 Voice Feature card is a full featured voice processing card that supports 192 DSP-based voice ports. Voice processing capabilities include Voice Activity Detection (VAD), comfort noise generation, adaptive jitter buffering, programmable 16 and 32 msec echo cancellation, programmable frame size, and Dual Tone Multiple Frequency (DTMF) detection and generation. The Cisco AS5800 Voice Feature card offers industry-leading DSP density and a wide range of VoIP codecs, including G.711, G.729, G.729a, G.723.1, and Group III real-time fax support, on any port at any time.

For more information on the Cisco AS5800, refer to the Cisco  AS5800 Universal Access Server Software Installation and Configuration Guide  (DOC-5800-SICG) or the Cisco  AS5800 Universal Access Server Hardware Installation Guide (DOC-5800-HICG) that shipped with your system.

For information on new features and Cisco IOS commands supported by Cisco IOS Release 12.1, see the "New and Changed Information" section and "Related Documentation" section.

System Requirements

This section describes the system requirements for Cisco IOS Release 12.1 AA:

• Memory Recommendations

• Hardware Supported

• Determining the Software Version

• Upgrading to a New Software Release

• Microcode and Modem Code Software

• Feature Set Tables

Memory Recommendations

Table 1: Memory Recommendations for the Cisco AS5800

System Components	Feature Set	Image Name	Software Image	Flash Memory Recommended	DRAM Memory Recommended
Cisco AS5800	IP Standard	IP Plus	c5800-p4-mz	16 MB	128 MB for NPE-200 256 MB for NPE-300
Dial Shelf: Cisco 5814		IP Plus	dsc-c5800-mz	8 MB	32 MB

Hardware Supported

Cisco IOS Release 12.1 AA supports the Cisco AS5800:

• Cisco DS5814

• Cisco RS7206

• Cisco RS7206 VXR

For detailed descriptions of the new hardware features, see "New and Changed Information" section. Table 2 and Table 3 detail the supported interfaces, cards, options, NPE support, and port adapters.

Table 2, Part 1: Supported Hardware for the Cisco AS5800

Interfaces, Cards Options, and Support,	Description	In1
Interfaces	12-port T1 or E1 termination card
	1- port channelized T3 (CT3) termination card
Modem Cards	72-port modem card (HMM)2
	144-port modem card (DMM)3
Voice Feature Cards (VFCs)	192-port voice card (VOX)
Optional AC-input Power Shelves	Two AC-input power supplies
NPE Support	With any Cisco AS5800 software image, the maximum hardware configuration with an NPE-200 router shelf (RS7206) is one CT3 or two T 1/E 1 trunk cards and five DMMs or 10 HMMs for a maximum of 28 T 1/24 E 1 controllers and 720 modems. If a larger configuration is desired, a second NPE-200 router shelf can be configured in split-shelf mode, or a single NPE-300 (RS7206 VXR). The NPE call limitations for a Cisco AS5800/Voice Gateway are 672 calls per NPE-200 and 1344 calls per NPE-300

1The number in the "In" column indicates the Cisco IOS release when the interface was introduced. For example, (4) means an interface was introduced in Cisco IOS Release 12.1(4). If a cell in this column is empty, the interface was included in the initial base release. 272-port modem card requires 32M DRAM. 3144-port modem card requires 64M DRAM.

Determining the Software Version

To determine the version of Cisco IOS software running on your Cisco AS5800, log in to the Cisco AS5800 and enter the show version EXEC command:

router> show version
Cisco Internetwork Operating System Software 
IOS (tm) 12.1 Software (c5800-p4-mz), Version 12.1(4)AA, RELEASE SOFTWARE

Upgrading to a New Software Release

For general information about upgrading to a new software release, see Cisco  IOS Upgrade Ordering Instructions located at:

http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/957_pp.htm

Microcode and Modem Code Software

Microcode software images are bundled with the system software image. Bundling eliminates the need to store separate microcode images. When the router starts, the system software unpacks the microcode software bundle and loads the proper software on all the interface processor boards. Table 3 lists the current microcode versions for the Cisco AS5800.

You could have received a later version of modem code than the one bundled with the Cisco IOS software. The modem code in Flash memory is mapped to the modems. Unless you fully understand how Cisco IOS software uses modem code, it is important to keep the factory configuration.

The modem code release notes are on CCO  and the Documentation CD-ROM.

On CCO  at:

Technical Documents: Documentation Home Page: Access Servers and Access Routers: Firmware and Portware Information

On the Documentation CD-ROM at:

Feature Set Tables

The Cisco IOS software is packaged in feature sets consisting of software images—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 are likely to require an export license. Customer orders may be denied or subject to delay due to United States government regulations. When applicable, purchaser/user must obtain local import and use authorizations for all encryption strengths. Please contact your sales representative or distributor for more information, or send an e-mail to export@cisco.com.

Table 4 lists the features and feature sets supported by the Cisco AS5800 in Cisco IOS Release 12.1 AA and uses the following conventions:

• Yes—The feature is supported in the software image.

• No—The feature is not supported in the software image.

Note   This feature set table might contain a selected list of features. This table might not be cumulative or list all the features in each image.

Table 4: Feature List by Feature Set for the Cisco AS5800

Features	Software Images by Feature Set
	IP Plus	IPsec 56
Authentication and Accounting
Selecting AAA Server Groups Based on DNIS	Yes	Yes
IP Routing
Asynchronous Serial Traffic over UDP	Yes	Yes
Cisco AS5800/Voice Gateway	Yes	Yes
Easy IP (Phase 2) DCHP Server	Yes	Yes
IP Enhanced IGRP Route Authentication	Yes	Yes
OSPF Point-to-Multipoint Networks with Neighbors	Yes	Yes
Policy Routing Infrastructure Update	Yes	Yes
LAN Support
CLI String Search	Yes	Yes
Configuring RADIUS for Multiple User Datagram Protocol Ports	Yes	Yes
Dynamic Multiple Encaps for Dial-In over ISDN	Yes	Yes
L2TP Dialout	Yes	Yes
Parse Bookmarks	Yes	Yes
SS7	Yes	Yes
Subnetwork Bandwidth Manager	Yes	Yes
Management
Cisco IOS File System	Yes	Yes
Dial Shelf Controller Redundancy	Yes	Yes
Entity MIB	Yes	Yes
Process MIB	Yes	Yes
SNMP Version 3	Yes	Yes
Security
DSC Redundancy	Yes	Yes
Resource Pool Management Server	Yes	Yes
Resource Pool Management with Direct Remote Services	Yes	Yes
WAN Services
E1 R2 Signaling for AS5800 Access Servers	Yes	Yes
E1 R1 Signaling for AS5800 Access Servers	Yes	Yes
Frame Relay Enhancements for K2 Scalability	Yes	Yes
ISDN Advice of Charge	Yes	Yes
Layer 2 Tunneling Protocol (L2TP)	Yes	Yes

New and Changed Information

The following is a list the new hardware and software feature categories supported by the Cisco AS5800 for Cisco IOS Release 12.1 AA. These categories are broken down by feature in Table 4.

• Authentication and Accounting

• IP Routing

• LAN Support

• Management

• Security

• WAN Services

MIBs

The Cisco AS5800 supports the following MIBs:

• ATM-MIB

• CALL TRACKER MIB

• CISCO MEMORY POOL MIB

• CISCO TOKEN RING MIB

• CISCO-ATM2-MIB

• CISCO-ATM-IF-PHYS-MIB

• CISCO-ATM-SIG-DIAG-MIB

• CISCO-BULK-FILE-MIB

• CISCO-CALL-HISTORY-MIB

• CISCO-ENTITY-MIB

• CISCO-FRAME-RELAY-MIB

• CISCO-ISDN-MIB

• CISCO-POP-MGMT-MIB

• CISCO-SYSLOG-MIB

• CISCO-VPDN-MGMT-MIB

• EXPRESSION-MIB

• FDDI-SMT73-MIB

• FSIP MIB

• OLD-CISCO-CHASSIS-MIB

• OLD-CISCO-MEMORY-MIB

• PROCESS MIB

• RFC1398-MIB

• RTT Mon MIB

• SONET-MIB

Note   Cisco Management Information Base (MIB) User Quick Reference is no longer published. If you have an account with CCO, you can find the latest list of MIBs supported by Cisco. To reach the Cisco Network Management Toolkit, go to CCO, press Login, and click to Software Center: Network Mgmt Products: Cisco Network Management Toolkit: Cisco MIB.

Limitations and Restrictions

IP LAN and ISDN Restrictions

The Cisco AS5800 contains the following IP LAN and ISDN router shelf restrictions:

• The Cisco AS5800 supports IP LAN traffic only.

• Cisco AS5800 systems that use more than 50 percent of its calls as ISDN calls should have 720 B channels per 7206VXR router shelf. Systems with more than 720 B channels requires two 7206VXR router shelves.

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 caveats in Cisco IOS Release 12.1, see Caveats for Cisco  IOS Release 12.1, which lists severity 1 and 2 caveats for Cisco IOS Release 12.1 and is 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. To reach Bug Navigator II, go to CCO and press Login. Then go to Software Center: Cisco IOS Software: Cisco Bugtool Navigator II. Another option is to go to http://www.cisco.com/support/bugtools.

Closed or Resolved Caveats—Release 12.1(4) AA

The caveats listed in this section are closed or resolved in Cisco IOS Release 12.1(4) AA.

• CSCdr30870

  A Cisco router might experience the equivalent of a memory leak when session directory cache (SDR) duplicates entries.

  Workaround: Enable timeouts for SAP cache, using the ip sap cache-timeout command (for example, ip sap cache-timeout 15). In some instances, using this configuration improves memory consumption rates.

  This has been resolved in Cisco IOS Release 12.1(4) AA.

• CSCdr35399

  The translation-rule global configuration command does not work correctly because of wrong matching. The number 8095100 should not be translated, but is translated to 809000. There is no workaround.

  This has been resolved in Cisco IOS Release 12.1(4) AA.

• CSCdr43569

  Dial-plan enhancements with wildcards "%," "?," "+," "[]," "()" and other features such as digit stripping are missing for voice features on the following Cisco products: 1700, 3600, 2600, 7200, and 7500 series routers; MC3810 multiservice access concentrators; and the AS5300 and AS5800 access servers. There is no workaround.

  This has been resolved in Cisco IOS Release 12.1(4) AA.

• CSCdr80040

  A Cisco AS5800 might crash with minimal call traffic producing the following error message:

%TTYDRIVER-3-RTSLOW: RTS is deasserted though rx queue is empty
 

  There is no workaround.

  This has been resolved in Cisco IOS Release 12.1(4) AA.

• CSCdr90885

  A modem in a Cisco AS5800 might enter a state in which it does not transmit information to the user. Users will not receive the login banner nor any Point-to-Point Protocol (PPP) packets. The "show modem log" will indicate a positive number of receive characters and no transmit characters. Often, the modem will also show an unusual high number of calls with low hold times. Running the show modem command will return the message "noCTS". The dial-shelf might show the following syslog error message:

%MICA-3-TOOMANYPARTICLES: Not enough particles - modem number:67 particles needed:1 available:-9; CTS off
 

  Workaround: Busy-out the problematic modem until the modem feature board or the router-shelf can be reset.

  This has been resolved in Cisco IOS Release 12.1(4) AA.

Related Documentation

The following sections describe the documentation available for the Cisco AS5800. These documents consist of hardware and software installation guides, Cisco IOS configuration and command references, system error messages, and other documents.

Documentation is available as printed manuals or electronic documents.

Use these release notes with these documents:

• Release-Specific Documents

• Platform-Specific Documents

• Cisco IOS Software Documentation Set

Release-Specific Documents

The following documents are specific to Cisco IOS Release 12.1 and are located on CCO  and the Documentation CD-ROM:

• Cross-Platform Release Notes for Cisco  IOS Release 12.1 

  On CCO  at:

  Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1

  On the Documentation CD-ROM at:

  Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Release Notes: Cross-Platform Release Notes

• Product bulletins, field notices, and other release-specific documents on CCO  at:

  Technical Documents

• Caveats for Cisco IOS Release 12.1 

  See Caveats for Cisco  IOS Release 12.1, which contain caveats applicable to all platforms for all maintenance releases of Cisco IOS Release 12.1.

  On CCO  at:

  Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Caveats

  On the Documentation CD-ROM at:

  Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Caveats

Platform-Specific Documents

These documents are available for the Cisco AS5800 on CCO  and the Documentation CD-ROM:

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 that 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, 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.

On CCO  at:

Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Configuration Guides and Command References

On the Documentation CD-ROM at:

Cisco IOS Release 12.1 Documentation Set

Table 5 describes the contents of the Cisco IOS Release 12.1 software documentation set for the AS5800, which is available in electronic form and in printed form ordered.

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 hard-copy documents were printed.

On CCO  at:

Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1

On the Documentation CD-ROM at:

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Note   Cisco Management Information Base (MIB) User Quick Reference is no longer published. If you have an account with CCO, you can find the current list of MIBs supported by Cisco. To reach the Cisco Network Management Toolkit, go to CCO, press Login, and click to Software Center: Network Mgmt Products: Cisco Network Management Toolkit: Cisco MIB.

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Obtaining Documentation

World Wide Web

You can access the most current Cisco documentation on the World Wide Web at http://www.cisco.com. Translated documentation can be accessed at http://www.cisco.com/public/countries_languages.shtml.

Documentation CD-ROM

Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly. Therefore, it is probably more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.

Ordering Documentation

Registered CCO users can order the Documentation CD-ROM and other Cisco Product documentation through our online Subscription Services at http://www.cisco.com/cgi-bin/subcat/kaojump.cgi.

Nonregistered CCO users can order documentation through a local account representative by calling Cisco's corporate headquarters (California, USA) at 408 526-4000 or, in North America, call 800 553-NETS (6387).

Obtaining Technical Assistance

Cisco provides Cisco Connection Online (CCO)  as a starting point for all technical assistance. Warranty or maintenance contract customers can use the Technical Assistance Center. All customers can submit technical feedback on Cisco documentation using the web, e-mail, a self-addressed stamped response card included in many printed documents, or by sending mail to Cisco.

Cisco Connection Online

Cisco continues to revolutionize how business is done on the Internet. Cisco Connection Online is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.

CCO's broad range of features and services helps customers and partners to streamline business processes and improve productivity. Through CCO, you will find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online support services, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.

Customers and partners can self-register on CCO to obtain additional personalized information and services. Registered users may order products, check on the status of an order and view benefits specific to their relationships with Cisco.

You can access CCO  in the following ways:

• WWW: www.cisco.com

• Telnet: cco.cisco.com

• Modem using standard connection rates and the following terminal settings: VT100 emulation; 8 data bits; no parity; and 1 stop bit.

  • From North America, call 408 526-8070

  • From Europe, call 33 1 64 46 40 82

You can e-mail questions about using CCO to cco-team@cisco.com.

Technical Assistance Center

The Cisco Technical Assistance Center (TAC) is available to warranty or maintenance contract customers who need technical assistance with a Cisco product that is under warranty or covered by a maintenance contract.

To display the TAC web site that includes links to technical support information and software upgrades and for requesting TAC support, use www.cisco.com/techsupport.

To contact by e-mail, use one of the following:

Language	E-mail Address
English	tac@cisco.com
Hanzi (Chinese)	chinese-tac@cisco.com
Kanji (Japanese)	japan-tac@cisco.com
Hangul (Korean)	korea-tac@cisco.com
Spanish	tac@cisco.com
Thai	thai-tac@cisco.com

In North America, TAC can be reached at 800 553-2447 or 408 526-7209. For other telephone numbers and TAC e-mail addresses worldwide, consult the following web site: http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml.

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 tips on configuring your Cisco products:

http://www.cisco.com/kobayashi/technotes/serv_tips.shtml

This URL is subject to change without notice. If it changes, point your Web browser to CCO, press Login, and click on this path: Technical Assistance Center: Technical Tips.

The following sections are provided from the Technical Tips page:

• Access Dial Cookbook—Contains common configurations or recipes for configuring various access routes and dial technologies.

• Field Notices—Notifies you of any critical issues regarding Cisco products and includes problem descriptions, safety or security issues, and hardware defects.

• Frequently Asked Questions—Describes the most frequently asked technical questions about Cisco hardware and software.

• Hardware—Provides technical tips related to specific hardware platforms.

• Hot Tips—Describes popular tips and hints gathered from the Cisco Technical Assistance Center (TAC). Most of these documents are available from the TAC Fax-on-demand service. To reach Fax-on-demand and receive documents at your fax machine from the United States, call 888 50-CISCO (888 502-4726). From other areas, call 650 596-4408.

• Internetworking Features—Lists tips on using Cisco  IOS software features and services.

• Sample Configurations—Provides actual configuration examples that are complete with topology and annotations.

Documentation Feedback

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

You can e-mail your comments to bug-doc@cisco.com.

To submit your comments by mail, for your convenience many documents contain a response card behind the front cover. Otherwise, you can mail your comments to the following address:

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