Release Notes for Cisco CVA120 Series Cable Voice Adapter for Cisco IOS Release 12.2 CZ
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Table Of Contents
Release Notes for Cisco CVA120 Series Cable Voice Adapter for Cisco IOS Release 12.2 CZ
Cisco CVA122 Cable Voice Adapter
Cisco CVA122E Cable Voice Adapter
Determining the Software Version
Upgrading to a New Software Release
New Software Features in Cisco IOS Release 12.2(15)CZ3
New Hardware Features in Cisco IOS Release 12.2(15)CZ3
New Software Features in Cisco IOS Release 12.2(15)CZ2
New Hardware Features in Cisco IOS Release 12.2(15)CZ2
New Software Features in Cisco IOS Release 12.2(15)CZ1
New Hardware Features in Cisco IOS Release 12.2(15)CZ1
No New Hardware Features in Release 12.2(15)CZ
New Software Features in Release 12.2(15)CZ
Baseline Privacy Interface Plus
Service Flows and Packet Classifiers
SNMPv3 Diffie-Hellman Kickstart
Additional DOCSIS 1.1 Features in Cisco IOS Release 12.2(15)CZ
Payload Header Suppression and Restoration
Migrating from Earlier Versions of DOCSIS
Uninterruptible Power Supply (UPS) and Power MIBs
Radio Frequency Interface MIBs
Open Caveats—Release 12.2(15)CZ3
Closed or Resolved Caveats—Release 12.2(15)CZ3
Open Caveats—Release 12.2(15)CZ2
Closed or Resolved Caveats—Release 12.2(15)CZ2
Open Caveats—Release 12.2(15)CZ1
Closed or Resolved Caveats—Release 12.2(15)CZ1
Open Caveats—Release 12.2(15)CZ
Closed or Resolved Caveats—Release 12.2(15)CZ
Cisco IOS Software Documentation Set Contents
Cisco IOS Release 12.2 Documentation Set
Obtaining Technical Assistance
Contacting TAC by Using the Cisco TAC Web Site
Release Notes for Cisco CVA120 Series Cable Voice Adapter for Cisco IOS Release 12.2 CZ
December 5, 2005
Cisco IOS Release 12.2(15)CZ3
OL-6094-04
These release notes describe the enhancements provided in Cisco IOS Release 12.2(15)CZ for the Cisco CVA120 series of cable voice adapters (CVA), which includes the Cisco CVA122 Cable Voice Adapter and the Cisco CVA122E Cable Voice Adapter. These release notes are updated as needed to describe new features, memory requirements, hardware support, software platform deferrals, and related documents.
Note
Unless otherwise indicated, the terms Cisco CVA120 Series Cable Voice Adapter and cable voice adapter refer to both the Cisco CVA122 Cable Voice Adapter and Cisco CVA122E Cable Voice Adapter.
For a list of software caveats that apply to Release Number_xa4, see the "Caveats" section and Caveats for Cisco IOS Release 12.2 T. The caveats document is updated for every maintenance release and is located on Cisco.com and the Documentation CD-ROM.
Use these release notes with Cross-Platform Release Notes for Cisco IOS
Release 12.2 located on Cisco.com and the Documentation CD-ROM. For complete documentation on the Cisco CVA120 Series Cable Voice Adapter, see the documentation listed in the "Related Documentation" section.Contents
These release notes describe the following topics:
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Introduction
For information on new features and Cisco IOS commands supported by Cisco IOS Release 12.2(15)CZ3, see the "New and Changed Information" section and the "Related Documentation" section.
The Cisco CVA120 Series Cable Voice Adapter gives residential subscribers high-speed Internet access. The cable voice adapter supports data traffic via a shared two-way cable system and Internet Protocol (IP) backbone network. The cable voice adapter connects computers and other customer premises devices at a subscriber site to the service provider's cable, hybrid-fiber coax (HFC), and IP backbone network.
The Cisco CVA120 series of cable voice adapters are based on Data-over-Cable Service Interface Specifications (DOCSIS) and European DOCSIS (EuroDOCSIS) standards. Depending on the model, they interoperate with any bidirectional, DOCSIS-qualified or EuroDOCSIS-qualified Cable Modem Termination System (CMTS). The cable voice adapter ships from the Cisco factory with a Cisco IOS software image stored in nonvolatile Flash memory that supports DOCSIS-compliant and EuroDOCSIS-compliant bridging operations.
The cable voice adapter uses its cable interface to connect to the CMTS over the HFC cable system. A personal computer (PC) connects to the cable voice adapter through either the Ethernet or Universal Serial Bus (USB) interface. The cable voice adapter then provides Internet access by forwarding traffic between the PC and the CMTS, creating a high-speed, permanent access to the Internet.
If supported by the service provider, the cable voice adapter can connect to multiple PCs by attaching a PC to each interface (Ethernet and USB). In addition, the cable voice adapter's Ethernet interface can connect to an Ethernet hub, and multiple computers can then be connected to the hub.
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In addition to providing DOCSIS/EuroDOCSIS connectivity, the cable voice adapter can optionally provide Voice over IP (VoIP) services, allowing subscribers to make telephone, modem, and fax calls over Transmission Control Protocol (TCP)/IP networks such as the Internet. These calls can be made to other VoIP devices, or to telephone, modem, or fax devices on the regular telephone network (the Public Switched Telephone Network, commonly known as PSTN).
The cable voice adapter can also function as an advanced router, providing wide area network (WAN) data connectivity in a variety of configurations.
Cisco CVA122 Cable Voice Adapter
The Cisco CVA122 Cable Voice Adapter features one F-connector interface to the cable system, one RJ-45 (10BASE-T Ethernet) hub port, one USB device port, and two RJ-11 analog voice ports. The USB interface enables the cable voice adapter to connect to a PC with a USB interface, without having the user to open the unit and install an Ethernet network interface card (NIC). If supported by the PC and service provider, PCs can be connected to the cable voice adapter using both the Ethernet and USB interfaces.
The Cisco CVA122 Cable Voice Adapter supports the DOCSIS standard, which was developed with service providers to ensure that any DOCSIS-certified cable modem can interoperate with any bidirectional, DOCSIS-qualified CMTS. The DOCSIS standard supports the North American National Television Systems Committee (NTSC) channel plan, with 6 MHz channel widths, a downstream range of 88 to 860MHz, and an upstream range of 5 to 42 MHz.
Cisco CVA122E Cable Voice Adapter
The Cisco CVA122E Cable Voice Adapter features one F-connector interface to the cable system, one RJ-45 (10BASE-T Ethernet) hub port, one USB device port, and two RJ-11 analog voice ports. The USB interface enables the cable voice adapter to connect to a PC with a USB interface, without having the user to open the unit and install an Ethernet network interface card (NIC). If supported by the PC and service provider, PCs can be connected to the cable voice adapter using both the Ethernet and USB interfaces.
The Cisco CVA122E Cable Voice Adapter supports the EuroDOCSIS standard, which is almost identical to the DOCSIS standard, except that it supports the European Phase Alternating Line (PAL) and Systeme Electronique Couleur Avec Memoire (SECAM) channel plans, with 8 MHz channel widths, a downstream range of 88 to 860MHz, and an upstream range of 5 to 65 MHz.
System Requirements
This section describes the system requirements for Cisco IOS Release 12.2(15)CZ3 and includes the following sections:
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Memory Recommendations
Table 1 lists the memory recommendations for each of the feature sets available for the cable voice adapter in Cisco IOS Release 12.2 CZ.
Note
Headend Interoperability
DOCSIS Concatenation
If using DOCSIS concatenation with a 16-QAM ((quadrature amplitude modulation) symbol rate, the CMTS must be configured for Unique Word 16 in the preamble for both short and long data burst profiles. On the Cisco uBR7200 series universal broadband routers, use the cable modulation-profile global configuration command and specify "uw16" for both the long and short modulation profiles.
DOCSIS 1.0+ Extensions
The cable voice adapter supports the Cisco DOCSIS 1.0+ Extensions, which include dynamic multi-Service ID (multi-SID) assignment and concatenation. The CMTS must also support the dynamic multi-SID and concatenation features. If you are using the Cisco uBR7200 series headend equipment as the CMTS router, Cisco IOS Release 12.1(1)T or greater is required on the CMTS router to ensure that these features are activated.
To configure the cable voice adapter to support multiple classes of service, use either the Cisco Subscriber Registration Center (CSRC) tool or the configuration file editor of your choice. DOCSIS configuration files can contain multiple classes of service (CoS) to support voice and other real-time traffic. The first CoS is used for data (and voice if no other CoS is defined), and additional classes of service can be defined to give higher priority for voice and other real-time traffic.
Supported Hardware
The Cisco CVA122 Cable Voice Adapter and Cisco CVA122E Cable Voice Adapter contain the following interfaces:
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Determining the Software Version
To determine the version of Cisco IOS software running on your cable voice adapter, log into the cable voice adapter and enter the show version EXEC command:
For the cable voice adapter:
cva122# show versionCisco Internetwork Operating System SoftwareIOS (tm) 120 Software (cva120-k8o3v9y5-mz), Version 12.2(15)CZ3, RELEASE SOFTWAREUpgrading to a New Software Release
For technical information about upgrading to a new software release, see Cisco IOS Upgrade Ordering Instructions on Cisco.com located at:
http://tools.cisco.com/Support/Fusion/index.do
For other information about upgrading to Cisco IOS Release 12.2 T, see the product bulletin Cisco IOS Software Release 12.2 T Ordering Procedures and Platform Support on Cisco.com at:
Service & Support: Software Center: Cisco IOS Software: Product Bulletins: Software
Under Cisco IOS 12.2, click on Cisco IOS Software Release 12.2 T Ordering Procedures and Platform Support
Feature Support
Cisco IOS software is packaged in feature sets that consist of software images that support specific platforms. The feature sets available for a specific platform depend on which Cisco IOS software images are included in a release. Each feature set contains a specific set of Cisco IOS features.
Caution
The feature set tables have been removed from the Cisco IOS Release 12.3 release notes to improve the usability of the release notes documentation. The feature-to-image mapping that was provided by the feature set tables is available through Cisco Feature Navigator.
Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or by feature set (software image). Under the release section, you can compare Cisco IOS software releases side by side to display both the features unique to each software release and the features that the releases have in common.
To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:
http://www.cisco.com/register
Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:
For frequently asked questions about Cisco Feature Navigator, see the FAQs at the following URL:
http://www.cisco.com/support/FeatureNav/FNFAQ.html
Determining Which Software Images (Feature Sets) Support a Specific Feature
To determine which software images (feature sets) in Cisco IOS Release 12.3 support a specific feature, go to the Cisco Feature Navigator home page, enter your Cisco.com login, and perform the following steps:
Step 1
Step 2
Step 3
Note
Repeat this step to add additional features. A maximum of 20 features can be chosen for a single search.
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Step 7
Determining Which Features Are Supported in a Specific Software Image (Feature Set)
To determine which features are supported in a specific software image (feature set) in Cisco IOS Release 12.3, go to the Cisco Feature Navigator home page, enter your Cisco.com login, and perform the following steps:
Step 1
Step 2
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New and Changed Information
The following sections list the new hardware and software features supported by the cable voice adapter.
New Software Features in Cisco IOS Release 12.2(15)CZ3
There are no new software features supported in Cisco IOS Release 12.2(15)CZ3.
New Hardware Features in Cisco IOS Release 12.2(15)CZ3
There are no new hardware features supported in Cisco IOS Release 12.2(15)CZ3.
New Software Features in Cisco IOS Release 12.2(15)CZ2
There are no new software features supported in Cisco IOS Release 12.2(15)CZ2.
New Hardware Features in Cisco IOS Release 12.2(15)CZ2
There are no new hardware features supported in Cisco IOS Release 12.2(15)CZ2.
New Software Features in Cisco IOS Release 12.2(15)CZ1
There are no new software features supported in Cisco IOS Release 12.2(15)CZ1.
New Hardware Features in Cisco IOS Release 12.2(15)CZ1
There are no new hardware features supported in Cisco IOS Release 12.2(15)CZ1.
No New Hardware Features in Release 12.2(15)CZ
Cisco IOS Release 12.2(15)CZ does not support any new hardware features.
New Software Features in Release 12.2(15)CZ
The following new software feature is supported in Cisco IOS Release 12.2(15)CZ.
DOCSIS 1.1 for Cisco uBR905 and Cisco uBR925 Cable Access Routers and Cisco CVA122 Cable Voice Adapters
DOCSIS 1.1 is the first major revision of the initial DOCSIS 1.0 standard for cable networks. Although the initial standard provided quality data traffic over the coaxial cable network, the demands of real-time traffic such as voice and video required many changes to the DOCSIS specification. DOCSIS 1.1 also includes support for the Baseline Privacy Interface Plus (BPI+) features, which improves and enhances the DOCSIS 1.0 BPI security and authorization mechanisms.
Note
The following sections describe the DOCSIS 1.1 features in more detail:
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DOCSIS 1.1 Overview
The DOCSIS 1.1 specification provides the following functional enhancements over DOCSIS 1.0 coaxial cable networks:
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Baseline Privacy Interface Plus
DOCSIS 1.0 included a Baseline Privacy Interface (BPI) to protect user data privacy across the shared-medium cable network and to prevent unauthorized access to DOCSIS-based data transport services across the cable network. BPI encrypts traffic across the RF interface between the cable modem and CMTS, and also includes authentication, authorization, and accounting (AAA) features.
BPI supports access control lists (ACLs), tunnels, filtering, protection against spoofing, and commands to configure source IP filtering on RF subnets to prevent subscribers from using source IP addresses that are not valid. These lists can be implemented either through CLI commands or by setting SNMP attributes through the DOCSIS configuration file.
DOCSIS 1.1 enhances these security features with Baseline Privacy Interface Plus (BPI+), which includes the following enhancements:
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X.509 Digital Certificates
BPI+ uses digital certificates and a public key infrastructure (PKI) that are based on the International Telecommunications Union (ITU) X.509 Version 3.0 standard. The key components of the X.509 standard are the following:
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A DOCSIS 1.1 cable modem contains two digital certificates programmed into it at the factory: a cable modem certificate that uniquely identifies it, and a manufacturing certificate that identifies the cable modem's manufacturer (in this case, Cisco Systems).
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During BPI+ initialization, the cable modem sends both of its signed digital certificates, the cable modem certificate (CMC) and the manufacturer's certificate (MC), to the CMTS. The CMTS verifies the cable modem certificate against the manufacturer's certificate, and then verifies the manufacturer's certificate against the DOCSIS Root CA certificate. This chain of verifications ensures that the CMTS can securely identify and authenticate each cable modem.
In addition, the CMTS can check the certificates against a Hot List of invalid certificates. The Hot List, which can be maintained by trusted authorities, such as a service provider or CA, can list certificates for individual cable modems that might have been stolen, hacked, or otherwise compromised. The list can also contain manufacturer's certificates for models of cable modems that the service provider does not support.
If all certificate verifications are successful, the CMTS begins the public key exchange process, which allows data encryption and decryption to begin.
Public Key Exchange
The secure use of X.509 digital certificates depends on both the cable modem and the CMTS possessing the proper encryption and decryption keys. For security and flexibility, DOCSIS 1.1 uses a dual-key public key exchange: the first set of keys, key encryption key (KEK), are used to encrypt and transmit the second set of keys, traffic encryption key (TEK), which are then used to encrypt and decrypt data.
Both sets of keys have a limited lifetime and must be renewed periodically. When a key reaches approximately half its lifespan, the cable modem begins the process to request a new set of keys. While the new set of keys is being exchanged, the cable modem can continue to use the old set to encrypt and decrypt data. The KEK keys have a longer lifetime than the TEK keys to ensure that the cable modem and CMTS will always be able to obtain new TEK keys, allowing data transmissions to continue without interruptions.
Secure Software Download
DOCSIS 1.1 supports secure software download to allow a service provider to remotely upgrade a cable modem's software without risk of interception or alteration. Secure software download also prevents users from upgrading the cable modem to unauthorized software images.
The manufacturer digitally signs the software image using a Pkcs#7 digital signature that is encrypted using the Rivest-Shamir-Adleman (RSA) algorithm and secure hash algorithm-1 (SHA-1). This digital signature is chained to the DOCSIS root code signing certificate so that it can be easily verified.
The cable operator can optionally also digitally sign the software image in a similar manner, using another digital signature that is chained to the DOCSIS root code signing certificate. This allows cable operators greater control over which software images are used on the cable network.
The cable operator initiates the software download by filling in the software filename and TFTP server fields (TLVs 9 and 21) in the DOCSIS configuration file that it sends to the cable modem during registration. You can also initiate a software download by using SNMP commands. In either case, the cable modem then requests the specified file and downloads it from the specified TFTP server.
The cable modem verifies the manufacturer's digital signature and, if present, the cable operator's digital signature, using the code verification certificates (CVCs) provided in the DOCSIS configuration file. If the signatures are valid, the cable modem loads and runs the software.
When a cable modem is running DOCSIS 1.1 software, it must use the secure software download feature to download a software image through the DOCSIS configuration file or through SNMP commands. Even if you disable BPI+, a DOCSIS 1.1 cable modem still accepts only digitally signed software images that can be verified through the secure software download process.
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The secure software download feature requires the following prerequisites:
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If the cable modem is currently running a DOCSIS 1.0 software image, you cannot use the secure software download to upgrade to a DOCSIS 1.1 image. Instead, you must use the DOCSIS 1.0 software upgrade process to load an unsigned DOCSIS 1.1 software image. Then you will be able to use the secure software download process to load a digitally signed DOCSIS 1.1 software image.
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If you load the M-CVC into the cable modem, you can download only those software images that Cisco Systems has digitally signed. If you load the C-CVC into the cable modem, you can download only those software images that Cisco Systems and the cable operator have digitally signed.
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After the cable modem loads and runs the DOCSIS 1.1 image, the cable modem must use the secure software download process for all future upgrades. In particular, this means that the cable modem cannot be downgraded to a DOCSIS 1.0 software image unless the manufacturer provides a digitally signed DOCSIS 1.0 image. After downgrading to a DOCSIS 1.0 image, you cannot use the secure software download process again until you have upgraded the cable modem to a new DOCSIS 1.1 image.
Tip
DOCSIS 1.1 Quality-of-Service
DOCSIS 1.1 implemented a number of changes to allow great flexibility in the ability of a cable modem and service provider to transmit almost any combination of data traffic and real-time traffic, such as voice and video. These changes required a fundamental shift in how a cable modem requests service and how traffic can be transmitted across the cable network.
Overview
The DOCSIS 1.1 QoS framework is based on the following objects:
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In the upstream direction, the output queues at the cable modem get remotely served by the CMTS MAC scheduler, based on DOCSIS 1.1 slot scheduling constraints such as grant-interval and grant-jitter. In the downstream direction, the CMTS packet scheduler serves the flow queues depending on the flow attributes like traffic priority, guaranteed rate, and delay bound.
DOCSIS 1.1 adds several new MAC scheduling disciplines to provide guaranteed QoS for real-time service flows on the multiple access upstream channel. Multiple grants per interval helps in supporting multiple subflows (such as voice calls) on the same SID. Multiple subflows per SID reduces the minimum SID requirement in cable modem hardware.
The CMTS is responsible for supporting QoS for all cable modems in its control. The traffic in the downstream is assumed to be a combination of voice, committed information rate (CIR) data, and excess burst best-effort data. To provide QoS support, the following functions must be performed:
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The admission control block helps the overall downstream QoS block to track the current bandwidth reservation state on a per-downstream basis. Decisions can be made whether to admit or reject a request for a new service flow on that DS channel, based on this reservation state and the QoS guarantees requested by the new service-flow.
IP packet classifiers help in filtering out unique service flows on an interface for differential QoS treatment. Rather than doing per-cable modem downstream rate shaping, DOCSIS 1.1 software provides rate shaping at a much more granular level of individual service flows of the cable modem.
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Service Flows and Packet Classifiers
Every cable modem establishes a primary service flow in both the upstream and downstream directions. The primary flows maintain connectivity between the cable modem and the CMTS at all times.
In addition, a DOCSIS 1.1 cable modem can establish multiple secondary service flows. The secondary service flows either can be permanently created (they persist until the cable modem is reset or powered off) or can be created dynamically to meet the needs of the on-demand traffic being transmitted.
A service flow gets created at the time of cable modem registration (a static service flow) or as a result of a dynamic MAC message handshake between the cable modem and the CMTS (a dynamic service flow). At any given time, a service flow might be in one of three states (provisioned, admitted, or active). Only active flows are allowed to pass traffic on the DOCSIS link.
Each service flow has a set of QoS attributes associated with it. These QoS attributes define a particular class of service and determine characteristics such as the maximum bandwidth for the service flow and the priority of its traffic. The class of service attributes can be inherited from a preconfigured CMTS local service class (class-based flows), or they can be individually specified at the time of the creation of the service flow.
Every service flow also has a unique (unique per DOCSIS MAC domain) identifier called the service flow identifier (SFID). The upstream flows in the admitted and active state have an extra Layer 2 SID associated with them. The SID is the identifier used by the MAC scheduler when specifying time-slot scheduling for different service flows.
Each service flow has multiple packet classifiers associated with it, which determine the type of application traffic allowed to be sent on that service flow. Each service flow can also have a payload header suppression (PHS) rule associated with it to determine which portion of the packet header will be suppressed when packets are transmitted on the flow.
Dynamic Channel Change
DOCSIS 1.1 supports Dynamic Channel Change (DCC) requests, which allow the CMTS to change the upstream or downstream frequency that the cable modem is using. This allows the CMTS to move cable modems to another channel when the current one is either becoming congested or is encountering growing noise problems that could eventually force the cable modems offline.
The Cisco uBR905 and Cisco uBR925 cable access routers and the Cisco CVA122 Cable Voice Adapter automatically support DCC requests when running Cisco IOS Release 12.2(15)CZ.
Dynamic Quality-of-Service
DOCSIS 1.1 adds support Dynamic Services MAC-layer messages that provide for Dynamic QoS (DQoS) between the cable modem and the CMTS. These messages are DOCSIS link-layer equivalents of the higher-layer messages that create, tear down, and modify a service flow. These messages are collectively known as DSX messages to represent the three types of dynamic service messages:
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The DSX state machine module on the cable modem manages the several concurrent dynamic service transactions between cable modems and the CMTS. The DSX state machine supports all three DOCSIS1.1 DSX MAC messages (DSA, DSC, DSD).
Provisioned QoS
Provisioned QoS (PQoS) allows the cable modem to create the service flows it needs for voice calls and other real-time traffic at the time it registers with the CMTS, without actually using the bandwidth for those flows. The service flow is kept in the admitted state and is activated only when the cable modem signals a voice call using the DOCSIS 1.1 Dynamic Service Request (DSC-REQ) message. Bandwidth is used only when the voice call is actually in progress.
To use PQoS services, you must configure the cable modem with secondary service flows for VoIP calls. (If you do not define any secondary service flows, DQoS is used instead of PQoS). You can use any voice signaling that is supported by the cable modem for VoIP traffic.
Table 2 compares how the router sets up and tears down VoIP calls when using DQoS and PQoS:
Service Flow Manager
The Service Flow Manager is a new module that manages different activities related to service flows on a cable interface. Typical events include the creation of new DOCSIS service flows, modification of the attributes of existing service flows, and the deletion of service flows.
Quality-of-Service Comparison
Quality-of-service (QoS) is a measure of performance for a transmission system that reflects its transmission quality and service availability. This section describes the differences in QoS between DOCSIS 1.1 and DOCSIS 1.0 and 1.0+.
DOCSIS 1.0
DOCSIS 1.0 uses a static QoS model that is based on a class of service (CoS) that is preprovisioned in the TFTP configuration file for the cable modem. The CoS is a bidirectional QoS profile that has limited control, such as peak rate limits in either direction and relative priority on the upstream.
DOCSIS 1.0 defines the concept of a service identifier (SID), which specifies the devices allowed to transmit and which provides device identification and CoS. In DOCSIS 1.0, each cable modem is assigned only one SID, creating a one-to-one correspondence between a cable modem and the SID. All traffic originating from, or destined for, a cable modem is mapped to that cable modem's SID.
Typically, a DOCSIS 1.0 cable modem has one CoS and treats all traffic the same, which means that data traffic on a cable modem can interfere with the quality of a voice call in progress. The CMTS, however, can prioritize downstream traffic based on IP precedent type-of-service (ToS) bits. For example, voice calls using higher IP precedence bits receive a higher queueing priority (but without a guaranteed bandwidth or rate of service). A DOCSIS 1.0 cable modem could increase voice call quality by permanently reserving bandwidth for voice calls, but then that bandwidth would be wasted whenever a voice call is not in progress.
DOCSIS 1.0+ Extensions
In response to the limitations of DOCSIS 1.0 in handling real-time traffic, such as voice calls, Cisco created the DOCSIS 1.0+ extensions to provide the more important QoS enhancements that were expected in DOCSIS 1.1. In particular, the DOCSIS 1.0+ enhancements provide basic Voice-over-IP (VoIP) service over the DOCSIS link.
Cisco DOCSIS 1.0+ extensions include the following DOCSIS 1.1 features:
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Caution
SNMPv3 Support
DOCSIS 1.1 also requires support of v3 of the Simple Network Management Protocol (SNMPv3). SNMPv3 offers a number of significant improvements over SNMPv1 and SNMPv2:
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SNMPv3 Diffie-Hellman Kickstart
To ensure SNMPv3 security, the Multi-Service Operator (MSO) must perform an initialization procedure the first time the cable modem comes online. This procedure, which the DOCSIS 1.1 specification refers to as the SNMPv3 Diffie-Hellman Kickstart, sends a public key to the cable modem as part of the DOCSIS configuration file. The cable modem creates a secret number and encrypts it using the public key it received in the configuration file.
The cable modem then publishes the encrypted number to the CMTS, which uses its private key to decrypt it so as to produce the cable modem's secret number. This secret number becomes a shared secret value that the CMTS and CM can use to exchange SNMPv3 encryption keys.
MIB Enhancements
DOCSIS 1.1 also expands the MIB support for SNMP management, including the following changes and additions to the DOCSIS 1.0 MIB structure:
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Additional DOCSIS 1.1 Features in Cisco IOS Release 12.2(15)CZ
The following sections describe the DOCSIS 1.1 software features that appear in Cisco IOS Release 12.2(15)CZ.
Concatenation
Concatenation allows the cable modem to make a single time-slice request for multiple packets and send all packets in a single large burst on the upstream. Concatenation was introduced in the upstream receive driver in DOCSIS1.0+ releases.
Fragmentation
Grant fragmentation allows the upstream MAC scheduler to slice large data requests to fit into the scheduling gaps between UGS (voice slots). This reduces the jitter experienced by the UGS slots when large data grants preempt the UGS slots. The grant fragmentation gets triggered in the MAC scheduler, and fragment reassembly happens in the upstream receive driver.
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IP Multicast Support
By default, a DOCSIS CMTS transmits IP multicast traffic without encryption. All DOCSIS cable modems receiving that multicast traffic must forward it to its attached CPE devices, without regard to whether any of the devices have requested the traffic. This can waste network bandwidth and require network devices to waste processor power in forwarding and processing undesired multicast traffic.
A DOCSIS 1.1 CMTS can instead use the Internet Group Management Protocol (IGMP) to maintain the multicast group memberships of its DOCSIS 1.1 cable modems. BPI+ encryption is used to encrypt the multicast packets so that only the cable modems with the appropriate public keys can decrypt the packets and forward them to their attached customer premises equipment (CPE) devices.
If a cable modem has not been granted the decryption keys for a particular multicast service flow, it does not forward the traffic to its CPE devices. This ensures that only authorized subscribers can receive the multicast traffic, and prevents cable modems from loading down their local networks by forwarding unnecessary multicast traffic.
DOCSIS 1.1 uses the concept of Security Associations (SA), which are dynamically created and maintained to provide the service flows required to transmit IP multicast traffic on the downstream. A cable modem sends an SA Map Request message to request the SA for the downstream service flow that is carrying the desired multicast traffic.
If the cable modem is not authorized to receive the multicast traffic, or if the traffic is not available on BPI+ encrypted SA, the CMTS sends an SA Map Reject message. The cable modem then does not repeat any further SA Map Requests for this particular multicast traffic. However, if the traffic is available on an unencrypted service flow, it begins forwarding that traffic to its CPE devices.
If the cable modem is authorized to receive the multicast traffic, and if the traffic is available, the CMTS replies with an SA Map Reply message to provide the information that allows the cable modem to receive the multicast traffic. The SA Map Reply message contains the SA identifier (SAID) for the traffic and the cryptographic suite that is necessary to decrypt the multicast traffic.
If the cable modem supports the cryptographic suite being used, it sends a Key Request to the CMTS, requesting the public keys it needs to decrypt the multicast service flow. If the CMTS replies with a Key Reply that contains the requested public keys, the cable modem begins decrypting the multicast traffic and forwarding it to its attached CPE devices.
The multicast traffic can be mapped to the cable modem's primary SA, a static SA, or a dynamically created SA. One service flow can support multiple multicast traffic flows, each with its own SAID. Multicast traffic mapped to a primary SA can be received only by the cable modem that is assigned the associated primary service flow. Multicast traffic mapped to static and dynamic SAs can be received by all cable modems that are assigned the associated secondary service flows.
Payload Header Suppression and Restoration
The PHS feature is used to suppress repetitive or redundant portions in packet headers before transmission on the DOCSIS link. This is a new feature in the DOCSIS1.1 MAC driver. The upstream receive driver is now capable of restoring headers suppressed by cable modems, and the downstream driver is capable of suppressing specific fields in packet headers before forwarding the frames to the cable modem.
Migrating from Earlier Versions of DOCSIS
DOCSIS 1.1 cable modems have additional features and better performance than earlier DOCSIS 1.0 and 1.0+ models, but all three models can coexist in the same network. DOCSIS 1.0 and 1.0+ cable modems will not hamper the performance of a DOCSIS 1.1 cable modem, nor will they interfere with operation of DOCSIS 1.1 features. There is full forward and backward compatibility in the standards.
Note
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122limit/122cz/ftcmdc11.htm
Note
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122limit/122cz/upgdcert.htm
MIBs
Current MIBs
To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB web site on Cisco.com at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
Supported MIBs
The cable voice adapter supports the following categories of MIBs:
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Cable Device MIBs
The cable voice adapter supports the Cable Device MIB, which is defined by RFC 2669 and describes 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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•
•
•
•
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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 cable voice adapter supports the Cisco Standard MIBs, which consist of the following components:
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•
•
•
•
Note
Cisco Voice MIBs
The Cisco CVA 120 series cable voice adapter supports the Cisco Voice MIBs, which consist of the following components:
•
•
•
Uninterruptible Power Supply (UPS) and Power MIBs
These MIBs describe the Cisco CVA120 Series Cable Voice Adapter's onboard environmental monitor, which includes information about the status of the UPS and the power supply. The power and UPS attributes are described in the table, "ciscoEnvMonSupplyStatusTable." To send a trap or interrupt request whenever the cable voice adapter switches between its onboard AC power supply and the UPS, set the "ciscoEnvMonEnableRedundantSupplyNotification" attribute to "true" to enable the "ciscoEnvMonRedundantSupplyNotification" trap.
Radio Frequency Interface MIBs
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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.
Cable-Specific MIBs
Table 3 shows the cable-specific MIBs that are supported on the cable voice adapter. This table also provides a brief description of each MIB's contents and the Cisco IOS software release in which the MIB was initially functional—earlier releases might have had unsupported prototype versions of the MIB; later releases might have added new attributes and functionality.
Note
Table 3 Supported MIBs for the Cisco CVA120 Series Cable Voice Adapter
SNMPv2-SMI.my
SNMPv2-SMI-V1SMI.my
This module specifies the Structure of Management Information (SMI) for SNMPv2, as defined in RFC 1902.
12.1(5)XU2
SNMPv2-TC.my
SNMPv2-TC-V1SMI.my
This module defines the textual conventions as specified in pages 4, 10-11 of RFC 854.
12.1(5)XU2
CISCO-SMI.my
CISCO-SMI-V1SMI.my
This module specifies the SMI for Cisco's enterprise MIBs.
12.1(5)XU2
CISCO-TC.my
CISCO-TC-V1SMI.my
This module defines the textual conventions used in Cisco's enterprise MIBs.
12.1(5)XU2
IF-MIB.my
IF-MIB-V1SMI.my
This module describes generic objects for the Layer 3 network interface sublayers. This MIB is an updated version of MIB-II's if table, and incorporates the extensions defined in RFC 2233.
12.1(5)XU2
CISCO-CABLE-SPECTRUM-MIB.my
CISCO-CABLE-SPECTRUM-MIB-V1SMI.my
This module describes the spectrum management flap list attributes.
12.1(5)XU2
DOCS-IF-MIB.my
DOCS-IF-MIB-V1SMI.my
This module describes the DOCSIS-compliant Radio Frequency (RF) interfaces in cable modems and cable modem termination systems, as described in RFC 2670.
12.1(5)XU2
DOCS-BPI-MIB.my
DOCS-BPI-MIB-V1SMI.my
This module describes the attributes for the DOCSIS-specified Baseline Privacy Interface (BPI) on cable modems and the CMTS.
12.1(5)XU2
CISCO-DOCS-EXT-MIB.my
CISCO-DOCS-EXT-MIB-V1SMI.my
This module extends the DOCSIS standard RFI MIB (DOCS-IF-MIB) with Cisco-specific extensions, such as Quality of Service (QoS) attributes and connection status and other information regarding the cable modems and CPE devices supported by the CMTS.
Note
—
DOCS-CABLE-DEVICE-MIB.my
DOCS-CABLE-DEVICE-MIB-V1SMI.my
This module was previously known as the CABLE-DEVICE-MIB and contains cable-related objects for DOCSIS-compliant cable modems, as specified in RFC 2669.
12.1(5)XU2
USB-MIB.my
This module describes the cable voice adapter's Universal Serial Bus (USB) interface. It is based on an IETF draft (draft-dolnik-usb-mib-02.txt), which is available on the IETF web site at http://www.ietf.org/index.html, in the "Internet Drafts" section.
12.1(5)XU2
Note
Deprecated MIBs
A number of Cisco-provided MIBs have been replaced with more scalable, standardized MIBs; these MIBs have filenames that start with "OLD" and first appeared in Cisco IOS Release 10.2. The functionality of these MIBs has already been incorporated into replacement MIBs, but the old MIBs are still present to support existing Cisco IOS products or network management system (NMS) applications. However, because the deprecated MIBs will be removed from support in the future, you should update your network management applications and scripts to refer to the table names and attributes that are found in the replacement MIBs.
Table 4 shows the deprecated MIBs and their replacements. In most cases, SNMPv1 and SNMPv2 replacements are available, but some MIBs are available only in one version. A few of the deprecated MIBs do not have replacement MIBs; support for these MIBs will be discontinued in a future release of Cisco IOS software.
Note
Caveats
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious. Severity 3 caveats are moderate caveats.
This section contains open and resolved caveats for Cisco IOS Release 12.2(15)CZ. All caveats in Release 12.2 T are also in Release 12.2(15)CZ.
For information on caveats in Cisco IOS Release 12.1 T, see Caveats for
Cisco IOS Release 12.1 T, which lists severity 1 and 2 caveats and selected severity 3 caveats, and is located on Cisco.com and the Documentation CD-ROM.Caveat numbers and brief descriptions for Release 12.2(15)CZ are listed in the following tables. For details about a particular caveat, go to Bug Toolkit at:
http://www.cisco.com/kobayashi/bugs/bugs.html
To access this location, you must have an account on Cisco.com. For information about how to obtain an account, go to the "Feature Navigator" section.
Note
Open Caveats—Release 12.2(15)CZ3
There are no open caveats specific to Cisco IOS Release 12.2(15)CZ3 that require documentation in the release notes.
Closed or Resolved Caveats—Release 12.2(15)CZ3
Table 9 lists the significant closed or resolved caveats that exist in Cisco IOS Release 12.2(15)CZ3.
Open Caveats—Release 12.2(15)CZ2
There are no open caveats specific to Cisco IOS Release 12.2(15)CZ2 that require documentation in the release notes.
Closed or Resolved Caveats—Release 12.2(15)CZ2
Table 9 lists the significant closed or resolved caveats that exist in Cisco IOS Release 12.2(15)CZ2.
Open Caveats—Release 12.2(15)CZ1
Table 7 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.2(15)CZ1 beta release.
Closed or Resolved Caveats—Release 12.2(15)CZ1
Table 9 lists the significant closed or resolved caveats that exist in Cisco IOS Release 12.2(15)CZ1.
Table 8 Closed or Resolved Caveats for Release 12.2(15)CZ1
CSCdx62749
When ARP entry exists to the TFTP/TOD/DHCP server through E0 interface of the CM, it will forward the packets through E0. This causes spoofing/theft-of-service in MSO.
Workaround: Please do not have ARP entry to the TFTP/TOD/DHCP servers through E0 interface. Let the device in the default state(do not add static APR to bypass TFTP/LOG servers.
CSCea33942
Symptoms: A Cisco uBR905 or Cisco uBR925 router may lose the configuration of the crypto map map-name local-address interface-id global configuration command from its startup configuration.
This issue is observed when the router reloads and is related to the use of the Cable DHCP Proxy feature.
Workaround: Set up a permanent lease for the loopback interface in the Dynamic Host Configuration Protocol (DHCP) server by using the "ethernet0" MAC address and assigning a fixed IP address on the DHCP server.
CSCea47684
Caller (phone number) id does not get displayed on the called party phone.
This problem is seen in all cable modem images.
There are no known workarounds.
CSCeb68456
This issue occurs when CM receives UCD while it send upstream packets. This is due to the output queue struck while processing UCD with upstream traffic on. This is very inconsistent problem only.
Sometimes CM gets reset by itself due to DHCP renewal failure.
Workaround: Reset the modem.
CSCed78149
A document that describes how the Internet Control Message Protocol (ICMP) could be used to perform a number of Denial of Service (DoS) attacks against the Transmission Control Protocol (TCP) has been made publicly available. This document has been published through the Internet Engineering Task Force (IETF) Internet Draft process, and is entitled "ICMP Attacks Against TCP" (draft-gont-tcpm-icmp-attacks-03.txt).
These attacks, which only affect sessions terminating or originating on a device itself, can be of three types:
1. Attacks that use ICMP "hard" error messages
2. Attacks that use ICMP "fragmentation needed and Don't Fragment (DF) bit set" messages, also known as Path Maximum Transmission Unit Discovery (PMTUD) attacks
3. Attacks that use ICMP "source quench" messagesSuccessful attacks may cause connection resets or reduction of throughput in existing connections, depending on the attack type.
Multiple Cisco products are affected by the attacks described in this Internet draft.
Cisco has made free software available to address these vulnerabilities. In some cases there are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20050412-icmp.shtml.
The disclosure of these vulnerabilities is being coordinated by the National Infrastructure Security Coordination Centre (NISCC), based in the United Kingdom. NISCC is working with multiple vendors whose products are potentially affected. Its posting can be found at: http://www.niscc.gov.uk/niscc/docs/re-20050412-00303.pdf?lang=en.
CSCed87222
A CPUHOG may appear on the console after a "clear crypto isa" or a "clear crypto sa" has been executed.
This does not have any connectivity side effects and can be treated as somewhat cosmetic.
There are no known workarounds.
CSCee08584
Cisco Internetwork Operating System (IOS®) Software release trains 12.1YD, 12.2T, 12.3 and 12.3T, when configured for the Cisco IOS Telephony Service (ITS), Cisco CallManager Express (CME) or Survivable Remote Site Telephony (SRST) may contain a vulnerability in processing certain malformed control protocol messages.
A successful exploitation of this vulnerability may cause a reload of the device and could be exploited repeatedly to produce a Denial of Service (DoS).
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20050119-itscme.shtml
Cisco has made free software upgrades available to address this vulnerability for all affected customers. There are workarounds available to mitigate the effects of the vulnerability.
This vulnerability is documented by Cisco bug ID CSCee08584.
CSCee18125
A Cisco 831 may crash with a SegV exception when you apply an EZVPN configuration to more than three inside interfaces and try to establish an EZVPN session.
This issue is observed on a Cisco 831 that runs the c831-k9o3y6-mz image of Cisco IOS Release 12.3(2)XE. The issue may also occur in Release 12.3 or 12.3 T.
Workaround: Do not apply the EZVPN configuration to more than three inside interfaces.
CSCee31134
Uncorrectable FEC counters associated with an UGS increase during registration process for cable modems attached to mc28u card.
Per SID flow counters can be observed with CLI "show interface cable x/y sid z counters verbose".
This issue does not affect cable modem functionality.
There are no known workarounds.
CSCee92874
When CM process DCC and changes to another downstream frequency, its observed that packet is not getting forwarded as the output queue is getting struck at C0 interface due to outgoing traffic.
If the packet is not getting forwarded, after sometime, CM will get reset due to DHCP renewal failure.
Workaround: Please reset the modem.
CSCef44225
A document that describes how the Internet Control Message Protocol (ICMP) could be used to perform a number of Denial of Service (DoS) attacks against the Transmission Control Protocol (TCP) has been made publicly available. This document has been published through the Internet Engineering Task Force (IETF) Internet Draft process, and is entitled "ICMP Attacks Against TCP" (draft-gont-tcpm-icmp-attacks-03.txt).
These attacks, which only affect sessions terminating or originating on a device itself, can be of three types:
1. Attacks that use ICMP "hard" error messages
2. Attacks that use ICMP "fragmentation needed and Don't Fragment (DF) bit set" messages, also known as Path Maximum Transmission Unit Discovery (PMTUD) attacks
3. Attacks that use ICMP "source quench" messagesSuccessful attacks may cause connection resets or reduction of throughput in existing connections, depending on the attack type.
Multiple Cisco products are affected by the attacks described in this Internet draft.
Cisco has made free software available to address these vulnerabilities. In some cases there are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20050412-icmp.shtml.
The disclosure of these vulnerabilities is being coordinated by the National Infrastructure Security Coordination Centre (NISCC), based in the United Kingdom. NISCC is working with multiple vendors whose products are potentially affected. Its posting can be found at: http://www.niscc.gov.uk/niscc/docs/re-20050412-00303.pdf?lang=en.
CSCef46191
A specifically crafted Transmission Control Protocol (TCP) connection to a telnet or reverse telnet port of a Cisco device running Internetwork Operating System (IOS) may block further telnet, reverse telnet, Remote Shell (RSH), Secure Shell (SSH), and in some cases Hypertext Transport Protocol (HTTP) access to the Cisco device. Telnet, reverse telnet, RSH and SSH sessions established prior to exploitation are not affected.
All other device services will operate normally. Services such as packet forwarding, routing protocols and all other communication to and through the device are not affected.
Cisco will make free software available to address this vulnerability.
Workarounds, identified below, are available that protect against this vulnerability.
The Advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040827-telnet.shtml
CSCef60718
A uBR925 running 12.3(10) reports incorrect Timing Offset.
There are no known workarounds.
CSCin75485
Modem does not support DCC with BPI enabled scenario.
There are no known workarounds.
CSCin82407
Cisco Internetwork Operating System (IOS) Software release trains 12.2T, 12.3 and 12.3T may contain vulnerabilities in processing certain Internet Key Exchange (IKE) Xauth messages when configured to be an Easy VPN Server.
Successful exploitation of these vulnerabilities may permit an unauthorized user to complete authentication and potentially access network resources.
This advisory will be posted to http://www.cisco.com/warp/public/707/cisco-sa-20050406-xauth.shtml
CSCin85109
Cable modem does not filter traffic based on the rules set in docsDevFilterIp Table.
This issue is seen only when the cable modem is used in routing mode.
Workaround: ip access-list filters could be configured using ios cli commands instead of using docsDevFilterIp Table in routing mode.
CSCsa49138
A ubr905 configured in routing mode and running 12.2(15)CZ can enter an init(o) loop if configured with DOCSIS TLV 11s (SNMP set operations).
The 905 will work fine from a power up. However, once the 905 is kicked offline (i.e. clear cable modem reset on CMTS), it will fail with the following error:
Dec 16 22:35:04.367: 280.280 CMAC_LOG_RESET_UNABLE_TO_SET_MIB_OBJECT<130>CABLEMODEM[CISCO]: Dec 16 22:35:04.367: <73040200> TLV-11 - IllegalSet operation failedThis will keep the 905 in an offline-init(o) loop. The same config will work fine on 12.2T or on 12.2(15)CZ if the CM is running as a "cable-modem compliant bridge".
There are no known workarounds.
Open Caveats—Release 12.2(15)CZ
There are no open caveats specific to Cisco IOS Release 12.2(15)CZ that require documentation in the release notes.
Closed or Resolved Caveats—Release 12.2(15)CZ
Table 9 lists the significant closed or resolved caveats that exist in Cisco IOS Release 12.2(15)CZ.
Related Documentation
The following sections describe the documentation available for the cable voice adapter. These documents consist of hardware and software installation guides, Cisco IOS configuration guides and command references, system error messages, feature modules, and other documents.
Most documentation is available as printed manuals or electronic documents, except for feature modules and select manuals, which are available online on Cisco.com and the Documentation CD-ROM.
Use these release notes with these documents:
•
Release-Specific Documents
The following documents are specific to Release 12.2 and are located on Cisco.com and the Documentation CD-ROM:
•
On Cisco.com at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.2: Release Notes: Cross-Platform Release Notes
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.2: Release Notes: Cross-Platform Release Notes
•
Technical Documents
•
As a supplement to the caveats listed in these release notes, see Caveats for Cisco IOS Release 12.2, which contains caveats applicable to all platforms for all maintenance releases of Release 12.2.
On Cisco.com at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.2: Release Notes: Caveats
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS 12.2: Caveats
Note
Platform-Specific Documents
These documents are available for the cable voice adapter on Cisco.com and the Documentation CD-ROM:
•
•
•
•
On Cisco.com at:
Technical Documents: Documentation Home Page: Cisco Product Documentation: Broadband/Cable Solutions: Cisco CVA120 Series Cable Voice Adapters
On the Documentation CD-ROM at:
Cisco Product Documentation: Broadband/Cable Solutions: Cisco CVA120 Series Cable Voice Adapters
Feature Modules
Feature modules describe new features supported by Release 12.2, and are updates to the Cisco IOS documentation set. A feature module consists of a brief overview of the feature, benefits, and 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 Cisco.com at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.2: New Feature Documentation
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.2: New Feature Documentation
Feature Navigator
Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a particular set of features and which features are supported in a particular Cisco IOS image.
Feature Navigator is available 24 hours a day, 7 days a week. To access Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, e-mail the Contact Database Administration group at cdbadmin@cisco.com. If you do not have an account on Cisco.com, go to http://www.cisco.com/register and follow the directions to establish an account.
To use Feature Navigator, you must have a JavaScript-enabled web browser such as Netscape 3.0 or later, or Internet Explorer 4.0 or later. Internet Explorer 4.0 always has JavaScript enabled. To enable JavaScript for Netscape 3.x or Netscape 4.x, follow the instructions provided with the web browser. For JavaScript support and enabling instructions for other browsers, check with the browser vendor.
Feature Navigator is updated when major Cisco IOS software releases and technology releases occur. It contains feature information about mainline-, T-, S-, and P-trains. You can access Feature Navigator at the following URL:
http://www.cisco.com/go/fn
Cisco IOS Software Documentation Set Contents
The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS command references, and several other supporting documents. The Cisco IOS software documentation set is 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 one or more configuration guides and one or more corresponding command references. Chapters in a configuration guide describe protocols, configuration tasks, and Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference.
On Cisco.com and the Documentation CD-ROM, two master hot-linked documents provide information for the Cisco IOS software documentation set.
On Cisco.com, beginning under the Service & Support heading:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.2: Configuration Guides and Command References
On the Documentation CD-ROM:
Cisco IOS Software Configuration: Cisco IOS Release 12.2: Configuration Guides and Command References
Cisco IOS Release 12.2 Documentation Set
Table 10 lists the contents of the Cisco IOS Release 12.2 software documentation set, which is available in both electronic and printed form.
Note
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.2
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.2
Obtaining Documentation
The following sections provide sources for obtaining documentation from Cisco Systems.
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 and may be more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.
Ordering Documentation
Cisco documentation is available in the following ways:
•
http://www.cisco.com/cgi-bin/order/order_root.pl
•
http://www.cisco.com/go/subscription
•
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:
Cisco Systems, Inc.
Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883We appreciate your comments.
Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools. For Cisco.com registered users, additional troubleshooting tools are available from the TAC web site.
Cisco.com
Cisco.com 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.
Cisco.com provides a broad range of features and services to help customers and partners streamline business processes and improve productivity. Through Cisco.com, you can find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online technical support, 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 Cisco.com to obtain additional personalized information and services. Registered users can order products, check on the status of an order, access technical support, and view benefits specific to their relationships with Cisco.
To access Cisco.com, go to the following web site:
http://www.cisco.com
Technical Assistance Center
The Cisco TAC web site is available to all customers who need technical assistance with a Cisco product or technology that is under warranty or covered by a maintenance contract.
Contacting TAC by Using the Cisco TAC Web Site
If you have a priority level 3 (P3) or priority level 4 (P4) problem, contact TAC by going to the TAC web site:
http://www.cisco.com/tac
P3 and P4 level problems are defined as follows:
•
•
In each of the above cases, use the Cisco TAC web site to quickly find answers to your questions.
To register for Cisco.com, go to the following web site:
http://www.cisco.com/register/
If you cannot resolve your technical issue by using the TAC online resources, Cisco.com registered users can open a case online by using the TAC Case Open tool at the following web site: http://www.cisco.com/tac/caseopen
Contacting TAC by Telephone
If you have a priority level 1(P1) or priority level 2 (P2) problem, contact TAC by telephone and immediately open a case. To obtain a directory of toll-free numbers for your country, go to the following web site:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
P1 and P2 level problems are defined as follows:
•
•
Feedback