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First Published: February 11, 2008
Note | Cisco IOS Release 12.2(33)SCA integrates support for this feature on the Cisco CMTS routers. This feature is also supported in Cisco IOS Release 12.3BC, and this document contains information that references many legacy documents related to Cisco IOS 12.3BC. In general, any references to Cisco IOS Release 12.3BC also apply to Cisco IOS Release 12.2SC. |
This document describes how to combine multiple cable interfaces in a Cisco Cable Modem Termination System (CMTS) universal broadband router into a single logical bundle, so as to conserve IP address space and simplify network management.
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.
The Virtual Interface Bundling feature is supported on the Cisco CMTS routers in Cisco IOS Release 12.3BC and 12.2SCA. Table below shows the hardware compatibility prerequisites for the Admission Control feature.
CMTS Platform |
Processor Engine |
Cable Interface Cards |
---|---|---|
Cisco uBR10012 Universal Broadband Router |
Cisco IOS Release 12.2(33)SCA Cisco IOS Release 12.2(33)SCB and later Cisco IOS Release 12.2(33)SCH and later |
Cisco IOS Release 12.2(33)SCA Cisco IOS Release 12.2(33)SCC and later Cisco IOS Release 12.2(33)SCE and later
|
Cisco uBR7246VXR Universal Broadband Router |
Cisco IOS Release 12.2(33)SCA and later
Cisco IOS Release 12.2(33)SCB and later
|
Cisco IOS Release 12.2(33)SCA and later
Cisco IOS Release 12.2(33)SCD and later
|
Cisco uBR7225VXR Universal Broadband Router |
Cisco IOS Release 12.2(33)SCA and later
Cisco IOS Release 12.2(33)SCB and later
|
Cisco IOS Release 12.2(33)SCA and later
Cisco IOS Release 12.2(33)SCD and later
|
This section describes the Virtual Interface Bundling feature in Cisco IOS 12.3(13a)BC and later releases, to include configuration, guidelines, examples and additional information in these topics:
Note | In Cisco IOS Release 12.3(21)BC and later releases, all cable bundles are automatically converted and configured to virtual interface bundles. Any standalone cable interfaces must be manually configured to be in a virtual bundle to operate properly. |
Cisco IOS Release 12.3(13a)BC first introduced support for virtual interface bundling on the Cisco uBR10012 universal broadband router and the Cisco uBR10-MC5X20S/U/H Broadband Processing Engine (BPE), and the Cisco uBR7246VXR router.
In prior Cisco IOS releases, cable interface bundling was limited to physical interfaces as master or slave interfaces, and show commands did not supply bundle information.
Virtual interface bundling removes the prior concepts of master and slave interfaces, and introduces these additional changes:
Virtual interface bundling prevents loss of connectivity on physical interfaces should there be a failure, problematic online insertion and removal (OIR) of one line card in the bundle, or erroneous removal of configuration on the master interface.
Virtual interface bundling supports and governs the following Layer 3 settings for the bundle member interfaces:
Note | This virtual interface for the bundle should always remain on (enabled with no shutdown). Prior to Cisco IOS Release 12.3(13a)BC, the Cisco CMTS displays a warning message prior to execution of the shutdown command. In Cisco 12.3(13a)BC and later releases, no warning message displays. |
The following guidelines describe virtual interface bundling, with comparison to the previous Cable Interface Bundling feature, where applicable:
Virtual interface bundling uses two configurations: the virtual bundle itself, and the interfaces in that virtual bundle, known as bundle members . The virtual interface bundle and bundle members are either aware of the bundle, or unaware of the bundle, as follows.
Cisco IOS Release 12.3(13a)BC introduces support for Internet Group Management Protocol (IGMPv3) Source Specific Multicast (SSM). This enhancement provides support for virtual interface bundling on the Cisco CMTS.
IGMP is used by IPv4 systems to report their IP multicast group memberships to any neighboring multicast routers. The latest IGMPv3 enables an individual member to join a particular channel. This is a new per-channel function, in addition to group-based functions (per-group). This channel based membership is known as Source Specific Multicast (SSM). IGMPv3 SSM allows a multicast client to specify the IP source from which they intend to receive, in addition to normal per-group multicast traffic.
For additional information about using IGMPv3 and virtual interface bundling, refer to enhanced show commands in this document, and to the following document on Cisco.com:
http://www.cisco.com/en/US/tech/tk86/tk804/technologies_white_paper09186a0080232b49.shtml
Migration to virtual interface bundling is automatic the first time a supporting Cisco IOS image is loaded onto the Cisco CMTS.
For cable interface bundling configured in releases prior to Cisco IOS Release 12.3(13a)BC, a new virtual bundle is created with bundle numbers ranging from 1 to 255. However, only a maximum of 40 virtual bundles are supported.
Note | In Cisco IOS Release 12.3(21)BC and later releases, standalone cable interfaces must be manually configured to be a member of a virtual bundle interface to operate properly. |
Note | When upgrading to Cisco IOS Release 12.3(21)BC or later from an earlier release, virtual bundles and bundle members are created and configured automatically. Standalone cable interfaces must be manually configured to be in a virtual bundle to operate properly. |
When upgrading to Cisco IOS Release 12.3(13a)BC from an earlier release, it may be necessary to reconfigure all cable interface bundling information after loading the Cisco IOS software image. In this circumstance, cable modems do not receive an IP address from the Cisco CMTS until cable interfaces and cable interface bundling is reconfigured.
To enable virtual interface bundling, and to reconfigure interface information on the Cisco CMTS as required, you first configure the virtual interface bundle, then add additional bundle members for the specified virtual bundle. Perform these steps on each interface, as needed for all virtual interface bundles.
To remove a virtual bundle from the interface, use the no interface bundle command in interface configuration mode, where n specifies the bundle identifier:
no interface bundle n
If you remove a member from a bundle, the bundle remains on the interface (even if empty) until the bundle itself is specifically removed.
In releases prior to Cisco IOS Release 12.3(21)BC, if you remove a bundle from an interface that still has active members, the bundle is removed.
Cisco IOS Release 12.3(13a)BC introduces support for several enhanced show commands that display virtual bundle information.
The following example illustrates a virtual interface bundle with the show ip interface brief command:
Router# show ip interface brief Interface IP-Address OK? Method Status Protocol FastEthernet0/0/0 1.8.44.1 YES NVRAM up up POS1/0/0 unassigned YES NVRAM up up GigabitEthernet2/0/0 11.0.0.2 YES NVRAM up up GigabitEthernet3/0/0 10.1.1.101 YES NVRAM up up GigabitEthernet4/0/0 1.1.1.1 YES NVRAM down down Cable8/1/0 unassigned YES NVRAM up up Cable8/1/1 unassigned YES NVRAM up up Cable8/1/2 unassigned YES NVRAM up up Cable8/1/3 unassigned YES NVRAM up up Cable8/1/4 unassigned YES NVRAM up up Bundle1 10.44.50.1 YES TFTP up up Router#
The following example illustrates virtual bundle information for the specified bundle:
Router# show running-config interface Bundle 1 Building configuration... Current configuration : 189 bytes ! interface Bundle1 ip address 10.44.51.1 255.255.255.0 secondary ip address 10.44.50.1 255.255.255.0 ip access-group 130 in ip helper-address 1.8.35.200 cable source-verify dhcp end
The following examples illustrate subinterface information for the specified bundle on a Cisco uBR10012 router:
Router# sh ip int br | include Bundle Bundle1 10.44.50.1 YES TFTP up up Bundle150 unassigned YES unset up up Bundle150.1 30.0.0.1 YES manual up up Bundle200 unassigned YES unset up up Bundle255 unassigned YES unset up up Router# sh run int Bundle150.1 Building configuration... Current configuration : 93 bytes ! interface Bundle150.1 ip address 30.0.0.1 255.0.0.0 cable helper-address 1.8.35.200 end
Related Topic |
Document Title |
---|---|
CMTS Command Reference |
Standards |
Title |
---|---|
SP-RFIv1.1-I09-020830 |
Data-over-Cable Service Interface Specifications Radio Frequency Interface Specification, version 1.1 |
SP-RFIv2.0-I03-021218 |
Data-over-Cable Service Interface Specifications Radio Frequency Interface Specification, version 2.0 |
SP-OSSIv2.0-I03-021218 |
Data-over-Cable Service Interface Specifications Operations Support System Interface Specification, version 2.0 |
SP-BPI+-I09-020830 |
Data-over-Cable Service Interface Specifications Baseline Privacy Plus Interface Specification, version 2.0 |
Description |
Link |
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Table below lists the release history for this feature.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.
Note | The below table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. |
Feature Name |
Releases |
Feature Information |
---|---|---|
Virtual Interface Bundling |
12.3(13a)BC |
Cable bundling was updated to virtual interface bundling, so that cable bundles are automatically converted to virtual interface bundles. Cable bundling concepts, such as master and slave linecards, are no longer supported. See the Information About Virtual Interface Bundling. In Cisco IOS Release 12.3(21)BC, all cable bundles are now automatically converted and configured to be in a virtual bundle, and standalone cable interfaces must be manually configured to be in a virtual bundle to operate properly. Previously, new virtual interface bundles and bundle members required reconfiguration, and there could also be standalone interfaces not part of a bundle at all. |
Automatic Virtual Interface Bundling |
12.2(33)SCA |
Support for the Cisco uBR7225VXR Universal Broadband Router was added. |