Table Of Contents
Release Notes for Cisco uBR924
Cable Access Router for Cisco IOS Release 12.0(7)XR1Determining the Software Version
Upgrading to a New Software Release
No New Hardware Features in Release 12.0(7)XR1
New Software Features in Release 12.0(7)XR1
No New Hardware Features in Release 12.0(7)XR
New Software Features in Release 12.0(7)XR
DOCSIS 1.0+ Extensions—Dynamic Multi-SID Assignment and Concatenation
No New Hardware Features in Release 12.0(7)T
New Software Features in Release 12.0(7)T
VPN Enhancement—Dynamic Crypto Map
NetRanger Support—Cisco IOS Intrusion Detection
Firewall (Phase II)—Cisco Secure Integrated Software
Simple Gateway Control Protocol 1.1
No New Hardware Features in Release 12.0(5)T
New Software Features in Release 12.0(5)T
Firewall (Phase I)—Cisco Secure Integrated Software
Baseline Privacy Management Information Base
New Hardware Features In Release 12.0(4)XI1
New Software Features In Release 12.0(4)XI1
Full and DOCSIS-Compliant Bridging
Using Multiple PCs with a Cisco uBR924 Cable Access Router
Last Maintenance Release of Cisco IOS Release 12.0 T
Supplemental and Corrected Text for the Online Feature Module
Resolved Caveats—Release 12.0(7)XR1
Open Caveats—Release 12.0(7)XR1
Open Caveats—Release 12.0(7)XR
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 the Cisco Technical Assistance Center Home Page
Release Notes for Cisco uBR924
Cable Access Router for Cisco IOS Release 12.0(7)XR1
January 17, 2000
These release notes for the Cisco uBR924 cable access router support Cisco IOS Release 12.0 T, up to and including Release 12.0(4)XI1, 12.0(5)T, 12.0(7)T, 12.0(7)XR, 12.0(7)XR1 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(7)XR1, see the "Caveats" section and Caveats for Cisco IOS Release 12.0 T. The caveats document is updated for every maintenance release and is located on Cisco Connection Online (CCO).
Use these release notes with Cross-Platform Release Notes for Cisco IOS Release 12.0 located on CCO.
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 cable 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 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.
Note
Starting with Cisco IOS Release 12.0(5)T, all Cisco uBR924 cable access router images support DOCSIS Baseline Privacy (BPI) encryption/decryption. BPI is subject to export restrictions.
Early Deployment Releases
These release notes describe the Cisco uBR924 cable access router for Release 12.0(7)XR1. Release 12.0(7)XR1 is an Early Deployment (ED) release based on Release 12.0 and announces fixes to software caveats and support for new Cisco hardware.
For information about features in Release 12.0, see Cross-Platform Release Notes for Cisco IOS Release 12.0 on CCO.
For information about features in other ED releases, see .
For information about features in other platforms, see Release Notes for Cisco IOS Release 12.0 on CCO.
System Requirements
This section describes the system requirements for IOS Releases 12.0(4)XI1, 12.0(5)T, 12.0(7)T, 12.0(7)XR, and 12.0(7)XR1:
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Memory Requirements
The image subset legend for Table 2 and is as follows:
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Headend Interoperability
Voice
Cisco IOS Release 12.0(7)XR and Cisco IOS Release 12.0(7)XR1 images introduce DOCSIS 1.0+ Extensions that support dynamic multi-SID assignment and concatenation. Dynamic multi-SID assignment enables you to dynamically and automatically add, delete, and modify multiple SIDs to have the parameters (such as QoS) required for the type of traffic passed over the data flow—typically voice, which requires a higher priority to ensure optimum voice quality. With dynamic multi-SIDs, high-bandwidth data streams can be created and eliminated as needed. Concatenation enables you to combine multiple upstream packets into one packet to reduce packet overhead and overall latency, as well as increase transmission efficiency.
Note
In Cisco IOS Release 12.0(7)T, Simple Gateway Control Protocol (SGCP) is introduced. SGCP is an alternative to the H.323 protocol that provides signaling and feature negotiation via a remote Call Agent (CA). SGCP eliminates the need for a dial plan mapper. It also eliminates the need for static configuration on the router to map IP addresses to telephone numbers because this function is provided by the remote CA.
To configure the Cisco uBR924 cable access router 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. The first CoS is used for data (and voice if no other CoS is defined), and a second CoS can be defined to give higher priority for voice traffic. Lower-priority traffic can then be fragmented to avoid interfering with the timeslots allocated for voice traffic.
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 series and Cisco 3600 series, using Cisco IOS Release 12.0(5)T or higher interim images. The gatekeeper must be running Cisco IOS Release 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.
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Advanced Data Feature Sets
Note
To support encryption/decryption, Cisco IOS images must contain encryption/decryption software at both the CMTS router 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.
If you are using Cisco 7200 series equipment, also refer to applicable release notes for the corresponding images at the headend that support the encryption/decryption software and the VPN solution set.
Hardware Supported
The Cisco uBR924 cable access router contains:
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Determining the Software Version
To determine the version of Cisco IOS software running on your Cisco uBR924 cable access router, log in to the Cisco uBR924 cable access router and enter the show version EXEC command:
router#show verCisco Internetwork Operating System SoftwareIOS (tm) 920 Software (UBR920-Y5-M), Version 12.0(7)XR1, 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: Software Center: Cisco IOS Software: 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 .)
Release 12.0(7)XR1 supports the same feature sets as Release 12.0, but Release 12.0(7)XR1 can include new features supported by the Cisco uBR924 cable access router.
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 may require an export license. Customer orders may be denied or subject to delay due to United States government regulations. When applicable, the purchaser or user must obtain local import and use authorizations for all encryption strengths. 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 Releasse 12.0(4)XI1, 12.(5)T, 12.0(7)T, 12.0(7)XR, and 12.0(7)XR1and 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.
No New Hardware Features in Release 12.0(7)XR1
There are no new hardware features supported by the Cisco uBR924 cable access router for Release 12.0(7)XR1.
New Software Features in Release 12.0(7)XR1
Cisco IOS Release 12.0(7)XR1 introduces additional capabilities from Cisco IOS Release 12.0(7)XR. Cisco IOS Release 12.0(7)XR1 consolidates all new software features added in Cisco IOS Release 12.0(7)XR and Cisco IOS Release 12.0(7)T. Cisco IOS Release 12.0(7)XR1 includes 3 DES and Firewall (Phase II) support not found in Cisco IOS Release 12.0(7)XR, but does not include 56-bit IPSec support found in Cisco IOS Release 12.0(7)T.
No New Hardware Features in Release 12.0(7)XR
There are no new hardware features supported by the Cisco uBR924 cable access router for Release 12.0(7)XR.
New Software Features in Release 12.0(7)XR
The following new software features are supported by the Cisco uBR924 cable access router for Release 12.0(7)XR.
DOCSIS 1.0+ Extensions—Dynamic Multi-SID Assignment and Concatenation
The following are Cisco uBR924 cable access router DOCSIS 1.0+ extensions that are supported in Cisco IOS Release 12.0(7)XR:
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No New Hardware Features in Release 12.0(7)T
There are no new hardware features supported by the Cisco uBR924 cable access router for Release 12.0(7)T.
New Software Features in Release 12.0(7)T
The following new software features are supported by the Cisco uBR924 cable access router for Release 12.0(7)T.
VPN Enhancement—Dynamic Crypto Map
Dynamic crypto map is one of the PIX IPSec network security commands. IPSec provides security for transmission of sensitive information over unprotected networks such as the Internet.
The dynamic crypto map command is used to create policy templates that are used when processing negotiation requests for new security associations from a remote IPSec peer, even if you do not know all of the crypto map parameters required to communicate with the remote peer (such as the peer's IP address). The dynamic crypto map allows you to accept requests for new security associations from previously unknown peers. These requests, however, are not processed until the ISAKMP (IKE) authentication has completed successfully.
When the firewall receives a negotiation request via IKE from another IPSec peer, the request is examined to see if it matches a crypto map entry. If the negotiation does not match any explicit crypto map entry, it will be rejected unless the crypto map set includes a reference to a dynamic crypto map.
If the firewall accepts the peer's request, at the point that it installs the new IPSec security associations, it also installs a temporary crypto map entry. This entry is filled in with the results of the negotiation. At this point, the firewall performs normal processing, using this temporary crypto map entry as a normal entry, even requesting new security associations if the current ones are expiring (based on the policy specified in the temporary crypto map entry). After all of the corresponding security associations expire, the temporary crypto map entry is removed.
Dynamic crypto map sets are not used for initiating IPSec security associations. However, they are used for determining whether or not traffic should be protected.
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NetRanger Support—Cisco IOS Intrusion Detection
Cisco IOS Release 12.0(7)T supports NetRanger programming. NetRanger is an Intrusion Detection System (IDS) composed of three parts:
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Firewall (Phase II)—Cisco Secure Integrated Software
Cisco IOS Release 12.0(7)T enhances the Cisco IOS Firewall feature set with the Cisco IOS Firewall (Phase II) set of features:
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For general information, see the description of the Cisco IOS Firewall Feature Set in the Cisco Product Catalog. For detailed information, see the Cisco IOS Firewall Feature Set documentation set, as well as the sections on Traffic Filtering and Firewalls in the Security Configuration Guide and Security Command Reference (available on the Documentation CD-ROM and CCO).
Simple Gateway Control Protocol 1.1
The Cisco uBR924 cable access router supports Simple Gateway Control Protocol (SGCP). SGCP is an out-of-band signaling protocol that interacts with the external Call Agent (CA) to establish telephone calls. SGCP eliminates the need for a dial plan mapper and static configuration on the router to map IP addresses to telephone numbers because this function is provided by the external CA.
The Cisco uBR924 cable access router supports SGCP residential gateway (RGW), as opposed to trunking gateway (TGW), which controls the telephone call.
SGCP MIB
The Simple Gateway Control Protocol (SGCP) Management Information Base (MIB) supports configuration, performance, and fault management of the SGCP interface. The SGCP MIB components are as follows:
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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
Note
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 three 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 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 (Phase I)
Data Encryption Standard (DES) is a standard cryptographic algorithm developed by the United States National Bureau of Standards. The Triple DES (3DES) images increase the encryption/decryption from the 56-bit IPSec feature set to 168 bit.
Layer 2 Tunneling Protocol
Layer 2 Tunneling Protocol (L2TP) is an emerging Internet Engineering Task Force (IETF) standard that combines 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 (Phase I)—Cisco Secure Integrated Software
The Firewall (Phase I) feature set extends the security technology currently available in Cisco IOS software to the Cisco uBR924 cable access router, providing firewall-specific capabilities. Firewall (Phase I) features include stateful, application-based filtering, dynamic per-user authentication and authorization, defense against network attacks, Java blocking, and real-time alerts. Firewall (Phase I) is interoperable with Cisco IOS software features including NAT, VPN tunneling protocols, Cisco Express Forwarding (CEF), AAA extensions, Cisco encryption technology, and Cisco IOS IPSec.
Baseline Privacy Management Information Base
The Baseline Privacy Management Information Base (MIB), as currently defined, is now available in Cisco IOS Release 12.0(5)T code. BPI allows an SNMP manager to monitor and manage the Cisco uBR924 cable access router's BPI configuration, including whether BPI is enabled, status of current authorization keys, current timeout values, real-time status counters, and additional information about authorization errors.
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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 the 26-gauge telephone wire is 3,000 feet or more.
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
Note
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 will be routed out the Ethernet interface or use the default gateway to reach the CMTS. This eliminates the need to run RIP on the cable interface.
To implement NAT on 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.
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 addresses and E.164 addresses.
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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(4)XI1, 12.0(5)T, 12.0(7)T, 12.0(7)XR, and 12.0(7)XR1 software.
Using Multiple PCs with a Cisco uBR924 Cable Access Router
The MAX CPE parameter in a Cisco uBR924 cable access router's DOCSIS configuration file determines how many PCs (or other CPE devices) are supported by that Cisco uBR924 cable access router. The default value for the MAX CPE parameter is 1, which means only one PC can be connected to the Cisco uBR924 cable access router.
The DOCSIS 1.0 specification states that a CMTS cannot age-out MAC addresses for CPE devices, so the first PC that is connected to a Cisco uBR924 cable access router is normally the only one that the CMTS recognizes as valid. If a subscriber replaces an existing PC or changes its network interface card (NIC) to one that has a different MAC address, the CMTS will refuse to let the PC come online because this would exceed the maximum number of CPE devices specified by the MAX CPE parameter.
To allow a subscriber to replace an existing PC or NIC, the following workarounds are possible:
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Layer 2 Tunneling Protocol
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.
Last Maintenance Release of Cisco IOS Release 12.0 T
Cisco IOS Release 12.0(6)T has been renamed 12.0(7)T to align this release with the 12.0(7) mainline release. The closed caveats for Release 12.0(7)T are identical to the caveats closed in the 12.0(7) mainline release. There was no change in the feature content of the renamed release—the features in 12.0(6)T are the same as 12.0(7)T. Release 12.0(7)T is the last maintenance release of the 12.0 T release train.
Customers needing closure of caveats for the 12.0 T features should migrate to the 12.1 mainline release, which has the complete feature content of Release 12.0 T and will eventually reach General Deployment (GD). Release 12.0 T is a superset of the 12.0 mainline release, so all caveats closed in the 12.0 mainline are also closed in 12.0 T.
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 or later software images.
Supplemental and Corrected Text for the Online Feature Module
Troubleshooting Tips for the uBR924 Cable Access Router, page 15, indicates: "Some CATV systems use alternative frequency plans such as the IRC (Incrementally Related Carrier) and HRC (Harmonically Related Carrier) plans. Most of the IRC channel slots overlap the EIA plan. The HRC plan is not supported by Cisco's cable access routers since so few cable plants are using this plan."
The correction should read: "For the Cisco uBR924 cable access router, both the IRC (Incrementally Related Carrier) and HRC (Harmonically Related Carrier) plans are supported. Most of the IRC channel slots overlap the EIA plan. For the Cisco uBR924 cable access router, both the IRC and HRC plans are supported.
The list of downstream search bands added for HRC have appropriate center frequencies and step values for an HRC channel plan. The expanded search band list may increase the amount of time required by the Cisco uBR924 cable access router to acquire the downstream signal on the HRC channel plan, which can add to the total time for complete registration of the modem the very first time it is added to the cable system."
Supported MIBs
The Cisco uBR924 cable access router supports the following categories of MIBs:
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The and are described in the following sections. For information on the SNMP standard MIBs and Cisco's platform and network-layer enterprise MIBs, see Cisco's MIB website at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
Cable-Specific MIBs
shows the cable-specific MIBs that are supported on the Cisco uBR924 cable access router. 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. Because of interdependencies, the MIBs must be loaded in the order given in the table.
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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 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.
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.
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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.
This section contains open and resolved caveats for Cisco IOS maintenance releases.
All caveats in Release 12.0 are also in Release 12.0 T.
For information on caveats in Cisco IOS Release 12.0 T, see Caveats for Cisco IOS 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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Resolved Caveats—Release 12.0(7)XR1
All the caveats listed in this section are resolved in Release 12.0(7)XR1. This section only describes severity 1 and 2 caveats.
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Under certain circumstances when the socket error condition occurs, the H.323 process that uses socket event API may spin with 98 percent to 100 percent CPU. There is no workaround.
To verify that this problem exists, enable debugging with the debug ip socket command and look for
SOCKET: Read failed:error messages after aprocess_get_socket_event.This caveat has caused the following voice images in Cisco IOS Release 12.0(7)XR to be deferred in Cisco IOS Release 12.0(7)XR:
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To prevent adverse impact to customer networks, Cisco Systems, Inc. deferred and removed the affected images from CCO. Customers already in possession of these images should wait for Cisco IOS Release 12.0(7)XR1.
Open Caveats—Release 12.0(7)XR1
This section describes possibly unexpected behavior by Release 12.0(7)XR1. 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.
Open Caveats—Release 12.0(7)XR
This section describes possibly unexpected behavior by Release 12.0(7)XR. 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.
Open Caveats—Release 12.0(7)T
This section describes possibly unexpected behavior by Release 12.0(7)T. 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.
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. This section only describes severity 1 and 2 caveats.
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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 is 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. This section only describes severity 1 and 2 caveats.
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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:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: 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•
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As a supplement to the caveats listed in these release notes, see Caveats for Cisco IOS Release 12.0 and 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:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: CaveatsOn the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS 12.0: Caveats
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Platform-Specific Documents
These documents are available for the Cisco uBR924 cable access router on CCO and the Documentation DC-ROM:
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On CCO at:
Technical Documents: 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(7)XR1, 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:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature DocumentationOn the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature DocumentationCisco 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.
Documentation Modules
Each module in the Cisco IOS documentation set consists of two books: a configuration guide and a corresponding command reference. Chapters in a configuration guide describe protocols, configuration tasks, Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference.
On CCO and the Documentation CD-ROM, two master hot-linked documents provide information for the Cisco IOS software documentation set.
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides and Command ReferencesOn the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides and Command ReferencesRelease 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.
You can find the most current Cisco IOS documentation on CCO and the Documentation CD-ROM.
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.0On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0
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Service and Support
For service and support for a product purchased from a reseller, contact the reseller, who offers a wide variety of Cisco service and support programs described in "Service and Support" of Cisco Information Packet that shipped with your product.
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For service and support for a product purchased directly from Cisco, use CCO.
Software Configuration Tips on the Cisco Technical Assistance Center Home Page
If you have a CCO login account, you can access the following URL, which contains links and tips on configuring your Cisco products:
http://www.cisco.com/kobayashi/serv_tips.shtml
This URL is subject to change without notice. If it changes, point your Web browser to CCO and click on this path: Products & Technologies: Products: Technical Tips.
The following sections are provided from the Technical Tips page:
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Cisco Connection Online
Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Maintenance customers and partners can self-register on CCO to obtain additional information and services.
Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco's customers and business partners. CCO services include product information, product documentation, software updates, release notes, technical tips, the Bug Navigator, configuration notes, brochures, descriptions of service offerings, and download access to public and authorized files.
CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously: a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, figures, graphics, and video, as well as hyperlinks to related information.
You can reach CCO in the following ways:
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For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.
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Documentation CD-ROM
Cisco documentation and additional literature are available in a CD-ROM package. The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly. Therefore, it might be more current than printed documentation. To order copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or as an annual subscription. You can also access Cisco documentation on the World Wide Web at http://www.cisco.com, http//www-china.cisco.com, or http://www-europe.cisco.com.
If you are reading Cisco product documentation on the World Wide Web, you can submit comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco. We appreciate your comments.
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