Table Of Contents
Release Notes for Cisco uBR924
Cable Access Router for Cisco IOS Release 12.0 THeadend Voice Interoperability
Determining the Version of Your Software Release
Upgrading to a New Software Release
No New Hardware Features In Release 12.0(5) T
New Software Features In Release 12.0(5) T
IPSec Network Security (IPSec)
Layer 2 Tunneling Protocol (L2TP)
New Hardware Features In Release 12.0(4) XI1
New Software Features In Release 12.0(4) XI1
Full and DOCSIS-Compliant Bridging
Home Office with Voice Support
Layer 2 Tunneling Protocol (L2TP)
Open Caveats—Release 12.0(5) T1
Resolved Caveats—Release 12.0(5) T1
Resolved Caveats—Release 12.0(5) T
Cisco IOS Software Documentation Set
Release 12.0 Documentation Set
Software Configuration Tips on Cisco's Technical Assistance Center Home Page
Release Notes for Cisco uBR924
Cable Access Router for Cisco IOS Release 12.0 T
August 26, 1999
These release notes for the Cisco uBR924 cable access router support Cisco IOS Release 12.0(4) XI1, up to and including Release 12.0(5) T or higher interim images. These release notes are updated as needed to describe new features, memory requirements, hardware support, software platform deferrals, and changes to the microcode or modem code and related documents.
For a list of software caveats that apply to Release 12.0(5) T, see Caveats for Cisco IOS Release 12.0 T 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 12.0 located on CCO and the Documentation CD-ROM.
Contents
These release notes describe the following topics:
Introduction
The Cisco uBR924 cable access router gives residential or Small Office/Home Office (SOHO) subscribers high-speed Internet or Intranet access and packet telephone services via a shared two-way cable system and IP backbone network. The router connects computers, telephone or fax equipment, and other customer premises devices at a subscriber site to the service provider's Hybrid/Fiber Coax (HFC) and IP backbone network.
The router is based on Data-Over-Cable Service Interface Specifications (DOCSIS) and interoperates with any bidirectional, DOCSIS-qualified Cable Modem Termination System (CMTS). The router ships from the Cisco factory with a Cisco Internetwork Operating System (IOS) software image stored in nonvolatile memory (NVRAM) that supports DOCSIS-compliant bridging data operations. The Cisco uBR924 cable access router functions as a cable modem—a modulator/demodulator at a subscriber site to convey data communications on the cable television system.
Based on the feature licenses your company purchased, other Cisco IOS images can be downloaded from Cisco Connection Online (CCO). Each Cisco uBR924 cable access router in your network can then be configured to support Voice over IP (VoIP) and/or other special operating modes based on your service offering and the practices in place for your network. The Cisco uBR924 cable access router can function as an advanced router, providing wide area network (WAN) data connectivity in a variety of configurations.
Early Deployment Releases
These release notes describe the Cisco uBR924 cable access router for Release 12.0(5) T. Release 12.0(5) T is an Early Deployment (ED) release based on Release 12.0 and announces fixes to software caveats and support for new Cisco software and hardware.
System Requirements
This section describes the system requirements for Release 12.0 T:
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Headend Voice Interoperability
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Memory Requirements
Headend Voice Interoperability
Voice
To support differentiated voice services using Cisco uBR7200 series headend equipment, use any CMTS Cisco IOS Release 12.0(4) XI image or higher. These headend images allow the definition of multiple Service Identifiers (SIDs) on the upstream. Voice traffic can then be designated on higher Quality of Service (QoS) secondary SIDs, while data traffic can be forwarded on a primary SID. That way, higher QoS SIDs receive preferential treatment at the headend for grants over any tiered "best effort" type data SIDs on that upstream.
To configure the Cisco uBR924 cable access router to support multiple classes of service, use the configuration file editor of your choice. DOCSIS configuration files can contain three Classes of Service (CoS) to support voice. The first CoS will be used for data (and voice if no other CoS is defined). The second and third CoS will be used for voice from each of the two VoIP ports on the Cisco uBR924 cable access router.
Note
When configured to support voice in Cisco IOS Releases 12.0(4) XI1 and 12.0(5) T, the Cisco uBR924 cable access router packetizes and transports voice in compliance with the H.323 protocol. H.323v2 is integrated in Cisco gatekeeper/gateway products, such as the Cisco 2600 and 3600, using Cisco IOS Release 12.0(5) T or higher interim images. The gatekeeper must be running 12.0(5) T or higher in order to support registration of the full E.164 address for each Cisco uBR924 cable access router port.
Advanced Data Feature Sets
To support data feature sets that involve encryption/decryption, Cisco IOS images must contain encryption/decryption software at both the CMTS and the Cisco uBR924 cable access router. Both the CMTS router and the Cisco uBR924 cable access router must be enabled and configured per the software feature set.
Should you have Cisco 7200 service, also reference applicable release notes for the corresponding images at the headend that support the feature set.
Hardware Supported
The Cisco uBR924 cable access router contains:
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Determining the Version of Your Software Release
To determine the version of Cisco IOS software running on your Cisco uBR924 cable access router, log in to the cable access router and enter the show version user EXEC command.
router#show verCisco Internetwork Operating System SoftwareIOS (tm) 920 Software (UBR920-Y5-M), Version 12.0(5)T, EARLY DEPLOYMENT RELEASE SOFTWARE (fc2)TAC:Home:SW:IOS:Specials for infoCopyright (c) 1986-1999 by cisco Systems, Inc.Upgrading to a New Software Release
For information about upgrading to a new software release, see the product bulletin Cisco IOS Software Release 12.0 T Upgrade Paths and Packaging Simplification (#819: 1/99) on CCO at:
Service & Support: Product Bulletins: Software
Under Cisco IOS 12.0, click Cisco IOS Software Release 12.0 T Upgrade (#819: 1/99)
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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. See below.
The image subset legend for Table 2 through Table 4is as follows:
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The Cisco uBR924 cable access router IP routing capabilities conserve IP addresses by using port-level multiplexed Network Address Translation (NAT) and Port Address Translation (PAT). Dynamic Host Configuration Protocol (DHCP) is used to distribute these or real IP addresses to the devices the Cisco uBR924 cable access router supports. NAT/PAT is bundled with DHCP server into a feature referred to as "Easy IP."
CautionCisco 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 Unites 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.
lists the features and feature sets supported by the Cisco uBR924 cable access router in Cisco IOS Release 12.0(5) T and uses the following conventions:
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Both and list the Cisco IOS software images by feature sets. lists the voice and data software images; lists the data-only software images.
New and Changed Information
The following sections list the new hardware and software features supported by the Cisco uBR924 cable access router for Release 12.0 T.
No New Hardware Features In Release 12.0(5) T
There are no new hardware features supported by the Cisco uBR924 cable access router for Release 12.0(5) T.
New Software Features In Release 12.0(5) T
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The following new software features are supported by the Cisco uBR924 cable access router for Release 12.0(5) T.
Fax
Fax support is introduced in Cisco IOS Release 12.0(5) T images that support voice. The two Cisco uBR924 cable access router VoIP ports can now be connected to telephone or fax devices. Also refer to New Hardware Features In Release 12.0(4) XI1.
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Enhanced Bridging
The Cisco uBR924 cable access router contains four RJ-45 (10BaseT Ethernet) hub ports. Using Cisco IOS Release 12.0(5) T or higher interim images, these hub ports can be connected to four computers directly or one of the four ports to an Ethernet hub. The Ethernet hub connects additional computers or devices at the site. A maximum of 3 devices can be bridged using Cisco IOS 12.0(4) XI or higher interim images. A maximum of 254 devices can be bridged using Cisco IOS 12.0(5) T or higher interim images. (No limit exists in routing mode.)
DOCSIS Baseline Privacy
The DOCSIS Baseline Privacy feature is based on the DOCSIS Baseline Privacy Interface Specification. It provides data privacy across the HFC network by encrypting traffic flows between the Cisco uBR924 cable access router and the cable operator's Cable Modem Termination System (CMTS).
Baseline Privacy security services are defined as a set of extended services within the DOCSIS MAC sublayer. Two new MAC management message types, BPKM-REQ and BPKM-RSP, are employed to support the Baseline Privacy Key Management (BPKM) protocol.
The BPKM protocol does not use authentication mechanisms such as passwords or digital signatures; it provides basic protection of service by ensuring that a cable modem, uniquely identified by its 48-bit IEEE MAC address, can only obtain keying material for services it is authorized to access. The Cisco uBR924 cable access router is able to obtain two types of keys from the CMTS: the Traffic Exchange Key (TEK), which is used to encrypt and decrypt data packets, and the Key Exchange Key (KEK), which is used to decrypt the TEK.
For more information on this feature, refer to the DOCSIS Baseline Privacy Interface Specification (SP-BPI-IO1-970922).
IPSec Network Security (IPSec)
IPSec Network Security (IPSec) is an IP security feature that provides robust authentications and encryption of IP packets. IPSec is a framework of open standards developed by the Internet Engineering Task Force (IETF). IPSec provides security for transmission of sensitive information over unprotected networks such as the Internet. IPSec acts at the network layer, protecting and authenticating IP packets between participating IPSec devices ("peers") such as the Cisco uBR924 cable access router.
IPSec provides the following network security services:
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Triple DES (3DES)
Data Encryption Standard (DES) is a standard cryptographic algorithm developed by the United States National Bureau of Standards. The 3DES images increase the encryption/decryption from the 56-bit IPSec feature set to 168 bit.
Layer 2 Tunneling Protocol (L2TP)
Layer 2 Tunneling Protocol (L2TP) is an emerging Internet Engineering Task Force (IETF) standard that combines the best features of two existing tunneling protocols: Cisco's Layer 2 Forwarding (L2F) and Microsoft's Point-to-Point Tunneling Protocol (PPTP). L2TP is an extension of the Point-to-Point Protocol (PPP), which is an important component for Access Virtual Private Networks (VPNs).
Traditional dial-up networking services only supported registered IP addresses, which limited the types of applications that could be implemented over VPNs. L2TP supports multiple protocols and unregistered and privately administered IP addresses over the Internet. This allows the existing access infrastructure, such as the Internet, modems, access servers, and ISDN terminal adapters (TAs), to be used.
L2TP can be initiated wherever PPTP or L2F is currently deployed and can be operated as a client initiated tunnel, such as PPTP, or a network access server (NAS) initiated tunnel, such as L2F.
Refer to the Limitations and Restrictions section for information regarding the functionality of the Cisco uBR924 cable access router in L2TP applications.
Firewall
The firewall feature set extends the security technology currently available in Cisco IOS software to the Cisco uBR924 cable access router, providing firewall-specific capabilities.
New Hardware Features In Release 12.0(4) XI1
The following new hardware feature is supported by the Cisco uBR924 cable access router for Release 12.0(4) XI1.The Cisco uBR924 cable access router contains two FXS VoIP ports that are labeled V1+V2 and V2 at the rear of the unit. These ports can be connected directly to telephones or to adapters that allow multiple telephones to be connected to each of the two VoIP telephone lines. The Ringer Equivalence Number (REN) determines how many telephones can be connected to a telephone line.
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Between 5 and 10 voice devices can be connected to each of the two VoIP telephone lines, provided each telephone line does not exceed the 5 REN limit. Typical length of telephone wire is 3,000 or more feet of 26 gauge.
The Cisco uBR924 cable access router can support the number of telephones typically found in small businesses.
New Software Features In Release 12.0(4) XI1
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The following new software features are supported by the Cisco uBR924 cable access router for Cisco IOS Release 12.0(4) XI1.Full and DOCSIS-Compliant Bridging
Full and DOCSIS-Compliant Bridging allows the Cisco uBR924 cable access router to operate with any DOCSIS-qualified CMTS.
The ability of the Cisco uBR924 cable access router to grant access to Customer Premises Equipment (CPE) devices is controlled by the "MAX CPE" field in the DOCSIS configuration file. The Cisco uBR924 cable access router defaults to one MAX CPE address unless this option is set to a higher number. The valid MAX CPE address range is 1 to 3 for bridging operation using Cisco IOS Release 12.0(4) XI1. In Cisco IOS Release 12.0(5) T or higher interim images, the valid MAX CPE address range is 1 to 254 for bridging operation.
Easy IP
Dynamic Host Configuration Protocol (DHCP) Server:
With the introduction of Easy IP, Cisco IOS Release 12.0(4) XI1 supports Intelligent DHCP Relay and DHCP Client functionality. A DHCP Relay Agent is any host that forwards DHCP packets between clients and servers. A DHCP Relay Agent enables the client and server to reside on separate subnets. If the Cisco IOS DHCP server cannot satisfy a DHCP request from its own database, it can forward the DHCP request to one or more secondary DHCP servers defined by the network administrator using standard Cisco IOS IP helper-address functionality.
Network Address Translation and Port Address Translation (NAT/PAT):
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Routing protocols will run on the Ethernet interface instead of the cable interface, and all packets received are translated to the correct private network IP address and routed out the Ethernet interface. This eliminates the need to run RIP on the cable interface.
To implement the Cisco uBR924 cable access router, the Ethernet interface is configured with an "inside" address and the cable interface is configured with an "outside" address. The Cisco uBR924 cable access router also supports configuration of static connections, dynamic connections, and address pools.
Routing (RIP V2)
A routing configuration for the Cisco uBR924 cable access router is most likely used when the cable access router is being added to an existing personal computer network. When configured in routing mode, the Cisco uBR924 cable access router will automatically configure the headend's IP address as its IP default gateway. When the IP host-routing is being configured, this automatic configuration of the headend's IP address as its IP default gateway will allow the Cisco uBR924 cable access router to send packets not intended for the Ethernet interface to the headend.
RIP V2 routing is useful for small internetworks in that it enables optimization of Network Interface Center (NIC)-assigned IP addresses by defining VLSMs for network addresses, and it allows Classless Interdomain Routing (CIDR) addressing schema.
Home Office with Voice Support
Acceptable voice quality and reduction in network bandwidth usage are achieved by using several voice processing techniques. Digital Signal Processors (DSPs), in combination with DSP firmware in the Cisco uBR924 cable access router, provide the stream-to-packet and packet-to-stream conversion, as well as voice processing capabilities. Typical voice processing services include echo cancellation, voice compression, Voice Activity Detection (VAD) or silence compression and Dual Tone Multi-Frequency (DTMF) tone detection and generation. Supported vocoders include:
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Use of the H.323 protocol typically involves a dial plan and mapper at the headend to map IP addresses to telephone numbers. You can also set static routes. Use dial peer commands to define local and remote peers. For the backup POTS port, define port and E.164 addresses. For remote peers, define remote peers IP address and E.164 address.
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Cable Device MIB
The Cable Device MIB is for DOCSIS-compliant cable modems and CMTS. The Cable Device MIB records statistics related to the configuration and status of the cable modem. Statistics include an events log and device status. The following list details the components of the Cable Device MIB:
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The Cable Device MIB is very similar to the RFI MIB in that both allow access to statistics; they are different in that the Cable Device MIB reports statistics on the cable modem, and the RFI MIB reports statistics on the radio frequency transmissions over the cable television line.
Cisco Standard MIBs
The Cisco Standard MIBs consist of the following components:
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Cisco Voice MIBs
The Cisco Voice MIBs consist of the following components:
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Radio Frequency Interface MIB
The Radio Frequency Interface (RFI) MIB module is for DOCSIS-compliant radio frequency interfaces in cable modems and CMTS. On the cable modem, RFI MIB entries provide:
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The RFI MIB includes tables describing both the CMTS and the cable modem side of the cable interface. All cable modem tables are implemented.
With IPSec, data can be transmitted across a public network without fear of observation, modification, or spoofing. This enables applications such as VPNs, extranets, and remote user access.
IPSec services are similar to those provided by Cisco Encryption Technology, a proprietary security solution introduced in Cisco IOS Software Release 11.2. However, IPSec provides a more robust security solution, and is standards-based.
Limitations and Restrictions
This section describes warnings and cautions about using Cisco IOS Release 12.0 T software.
Layer 2 Tunneling Protocol (L2TP)
The current implementation of L2TP in Cisco IOS Release 12.0(5) T is dependent on a PPP connection supported on one of the directly attached interfaces. A dial-up PPP connection is required in order to initiate an L2TP Tunnel connection. This is a requirement of the L2TP Access Concentrator (LAC). In Cisco IOS Release 12.0(5) T, the Cisco uBR924 cable access router cannot function as the LAC; it can only function as the L2TP Network Server (LNS), which terminates a tunnel created elsewhere in the network.
Important Notes
This section contains important information about using Cisco IOS Release 12.0 T software.
Voice
For Cisco IOS Release 12.0(4) XI1 software images, the Cisco uBR924 cable access router would only work with a routing headend. This is no longer true in Cisco IOS Release 12.0(5) T software images.
Deprecated MIBs
Older Cisco Management Information Bases (MIBs) will be replaced in a future release. OLD-CISCO-* MIBS are currently 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 .
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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 12.0 T, see Caveats for Cisco IOS Release 12.0 T.
All caveats in Release 12.0 are also in Release 12.0 T.
For information on caveats in Cisco IOS Release 12.0, see Caveats for Cisco IOS Release 12.0 which lists severity 1 and 2 caveats, and is located on CCO and the Documentation CD-ROM.
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Open Caveats—Release 12.0(5) T1
This section describes possibly unexpected behavior by Release 12.0(5) T1. This section only describes severity 1 and 2 caveats.
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The Cisco uBR924 cable access router, when running the NAT and firewall features, crashes if establishing roughly 150 Solaris_telnet sessions.
Resolved Caveats—Release 12.0(5) T1
All the caveats listed in this section are resolved in Release 12.0(5) T1.
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When more than one Cisco uBR924 cable access router is networked, bandwidth requests are sent to the CMTS simultaneously if the bandwidth request backoff is not set correctly on the cable modem interface of the Cisco uBR924 cable access router. This results in a bandwidth request collision, possibly indicating an upstream transmit driver/MAC problem. Whenever a long string of ping timeouts are detected, the Cisco uBR924 cable access router does not send bandwidth requests to the CMTS. The Cisco uBR924 cable access router ping timeout occurs then with all CMTS images.
This caveat caused the deferral from Cisco IOS Release 12.0(5) T images.
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The Cisco uBR924 cable access router crashes in certain instances due to cable modem registration problems: segV with deb cab mac mess reg-rsp on. This is due to no vendor ID in the message. The crash occurs when using the ubr920-k1y5-mz image.
This caveat caused the deferral from Cisco IOS Release 12.0(5) T images.
Resolved Caveats—Release 12.0(5) T
All the caveats listed in this section are resolved in Release 12.0(5) T.
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Values selected for Initial Ranging backoffs in Cisco IOS Release 12.0(4) XI images were not random enough. This could cause several Cisco uBR924 cable access routers powered on at the same time to take a long time to get through initial ranging and bring the cable interface up.
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After receiving a UCC request using Cisco IOS Release 12.0(4) XI images, the Cisco uBR924 cable access router could complete initial ranging too soon. This could cause the router to fail in secondary ranging because the unit took too long to get through secondary ranging.
This caused the deferral from Cisco IOS Release 12.0(4) XI to Cisco IOS Release 12.0(4) XI1.
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Voice accounting to RADIUS server did not work. Cisco IOS Release 12.0(5) T images permit RADIUS to be used to authenticate subscribers (typically incoming calls) on the Cisco uBR924 cable access router acting as a gateway.
This caused the deferral from Cisco IOS Release 12.0(4) XI to Cisco IOS Release 12.0(4) XI1.
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A CMTS would send a UCD for every upstream channel available in a given downstream channel. The Cisco uBR924 cable access router downstream MAC message processing did not have enough buffers to handle several MAC messages at the same time and as a result would only process the first four UCDs received. The Cisco uBR924 cable access router would never know about and never be able to use any upstream other than the upstreams for which the first four UCDs were sent.
This caused the deferral from Cisco IOS Release 12.0(4) XI to Cisco IOS Release 12.0(4) XI1.
Related Documentation
The following sections describe the documentation available for the Cisco uBR924 cable access router. 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:
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Release-Specific Documents
The following documents are specific to Release 12.0 and are located on CCO and the Documentation CD-ROM:
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On CCO at:
Service & Support: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Release Notes: Cross-Platform Release Notes for Cisco IOS Release 12.0On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Release Notes: Cross-Platform Release Notes for Cisco IOS Release 12.0•
Service & Support: Technical Documents•
As a supplement to the caveats listed in Caveats in these release notes, see Caveats for Cisco IOS Release 12.0 T, which contains caveats applicable to all platforms for all maintenance releases of Release 12.0 T.
On CCO at:
Service & Support: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Caveats: Caveats for Cisco IOS Release 12.0 T
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS 12.0: Caveats: Caveats for Cisco IOS Release 12.0 T
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Platform-Specific Documents
These documents are available for the Cisco uBR924 cable access router on CCO and the Documentation CD-ROM:
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On CCO at:
Service & Support: Documentation Home Page: Cisco Product Documentation: Broadband/Cable Solutions: Cisco uBR900 Series Cable Access RoutersOn the Documentation CD-ROM at:
Cisco Product Documentation: Broadband/Cable Solutions: Cisco uBR900 Series Cable Access RoutersFeature Modules
Feature modules describe new features supported by 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 at:
Service & Support: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation: New Features in Release 12.0 TOn the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation: New Features in Release 12.0 TCisco 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 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:
Service & Support: Documentation Home Page: 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
On the Documentation CD-ROM at:
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
describes the contents of the Cisco IOS Release 12.0 software documentation set, which is available in electronic form and in printed form upon request.
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You can reach the Cisco IOS documentation set on CCO at:
Service & Support: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides and Command References
You can reach the Cisco IOS documentation set on the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides and Command References
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