Table of Contents

Benefits
Restrictions
Related Features and Technologies
Related Documents

Creating Interface Bundles

cable bundle

Syntax Description
Default
Command Mode
Command History
Usage Guidelines
Examples
Related Commands

show cable bundle

Syntax Description
Default
Command Mode
Command History
Example
Related Commands

Cable Interface Bundling for the Cisco uBR7200 Series Cable Router

Feature Overview

This feature allows multiple cable interfaces to share a single IP subnet. Currently, you must use an IP subnet for each cable interface. If you have limited IP address space, interface bundling conserves limited IP address resources. Interface bundling eliminates the need to renumber IP addresses to configure new cable interfaces.

Benefits

Cable interface bundling eliminates the need for an IP subnet for each cable interface. With this feature, you only need one IP subnet for each cable bundle. Further, you can group all the cable interfaces on a Cisco uBR7200 series cable router into a single bundle and configure your uBR7200 router with a single IP subnet.

Restrictions

Cable interface bundling is only supported on cable interfaces.

You can only configure interface bundles using the CLI. You cannot use MIB objects to configure cable interface bundles.

Related Features and Technologies

Table 1shows the progression of documented features that have been added to the uBR platform in the Cisco IOS 12.0 time frame.

Related Documents

The uBR7200 series cable router is described in Voice, Video, and Home Applications Configuration Guide for Cisco IOS Release 12.0 and in the following online feature modules:

• Cisco uBR7246 Universal Broadband Router Feature Enhancements

• MC16 Modem Card for uBR7200

• uBR7200 Series Access List Support Enhancements

• QoS Profile Enforcement for the Cisco  uBR7200 Series Router

• Upstream Traffic Shaping Feature

• Configuring Downstream Channel IDs

• Telephone Return for the Cisco uBR7200 Series Cable Router

• Enhanced-Spectrum Management for the Cisco uBR7200 Series Cable Router

• Time Server Functionality

• Cable Interface Bundling for the Cisco uBR7200 Series Cable Router (this feature)

• Quality of Service for Voice on the Cisco uBR7200 Series Cable Router

• Modem Status Enhancements for the Cisco uBR7200 Series Cable Router

• Load Sharing Support

• Cable Modem and Host Subnet Addressing

• MGX Resource Pool Management Hardware Diagnostics

• IP Address Verification for the Cisco uBR7200 Series Cable Router

• Configuring the Registration Timeout Value for the Cisco uBR7200 Series Cable Router

• Spectrum Management Using the MC16S Modem Card on the Cisco uBR7200 Series Cable Router

• Configuring Downstream Test Signals for the Cisco uBR7200 Series Cable Router

• Configuring Concatenation on the Cisco uBR7200 Series Cable Router

• Point-to-Point Wireless Support for the Cisco uBR7200 Series Universal Broadband Router

• Blind Hopping Support on the MC16S Modem Card for the Cisco uBR7200 Series Cable Router

• Downstream Rate Shaping with TOS bits on the uBR7200 Series Cable Router

• Amplitude Averaging Compensation on the Cisco uBR7200 Series Cable Router

Supported Platforms

Cisco 7200 series

Supported Standards, MIBs, and RFCs

Standards

No new or modified standards are supported by this feature.

MIBs

No new or modified MIBs are supported by this feature.

RFCs

No new or modified RFCs are supported by this feature.

Configuration Task

See the following section for configuring cable interface bundling.

Creating Interface Bundles (Required)

Creating Interface Bundles

Command	Purpose
Router(config-if)#cable bundle n master	Configures the interface n to be the master interface in a bundle.

Monitoring Interface Bundling

Command	Purpose
Router# show cable bundle n forwarding-table	Displays the forwarding table for the specified interface.

Configuration Examples

This section provides the following configuration examples:

• Creating interface 25 as the master interface in the bundle

• Displaying the contents of the bundle

Router(config-if)#cable bundle ?
  <1-255>  Bundle number
Router(config-if)#cable bundle 25 ?
  master  Bundle master
  <cr>
Router(config-if)#cable bundle 25 master ?
  <cr>
Router(config-if)#cable bundle 25 master
Router(config-if)#
07:28:17: %UBR7200-5-UPDOWN: Interface Cable3/0 Port U0, changed state to down
07:28:18: %UBR7200-5-UPDOWN: Interface Cable3/0 Port U0, changed state to up
 
...
 
Router#show cable bundle 25 forwarding-table
MAC address         Interface
0050.7366.17ab      Cable3/0
0050.7366.1803      Cable3/0
0050.7366.1801      Cable3/0
 

Command Reference

This section documents the new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command reference publications.

• cable bundle

• show cable bundle

In Cisco IOS Release 12.0(1)T or later releases, you can search and filter the output for show and more commands. This functionality is useful when you need to sort through large amounts of output, or if you want to exclude output that you do not need to see.

To use this functionality, enter a show or more command followed by the "pipe" character (|), one of the keywords begin, include, or exclude, and an expression that you want to search or filter on:

The following is an example of the show atm vc command in which you want the command output to begin with the first line where the expression "PeakRate" appears:

For more information on the search and filter functionality, refer to the Cisco IOS Release 12.0(1)T feature module CLI String Search.

cable bundle

To configure a cable interface to belong to an interface bundle, use the cable bundle interface configuration command. To delete a cable interface bundle definition, use the no form of this command.

Syntax Description

Default

No default behavior or values.

Command Mode

Interface configuration

Command History

Usage Guidelines

You can configure up to four interface bundles. In each bundle, specify one interface as the master interface by using the optional master keyword.

Only configure an IP address on the master interface. Any attempt to add an interface to a bundle will be rejected, if an IP address is configured and the interface is not specified as master interface.

You must specify all generic IP networking information (IP address, routing protocols, switching modes, and so on.) on the bundle master interface. Do not specify generic IP networking information on bundle slave interfaces.

If you attempt to add an interface to a bundle as non-master interface and an IP address is assigned to this interface, the command will fail. You must remove the IP address configuration before you can add the interface to a bundle.

If you have configured an IP address on a bundled interface and the interface is not the master interface, a warning message appears.

Specify generic (that is, not downstream or upstream related) cable interface configurations, such as source-verify or ARP handling, on the master interface. Do not specify generic configuration on non-master interfaces.

If you configure an interface as part of a bundle and it is not the master interface, all generic cable configuration for this interface is removed. The master interface configuration will then apply to all interfaces in the bundle.

If you shut down or remove the master interface in a bundle, no data packets is sent to any of the interfaces in this bundle. Packets will still be physically received from non-master interfaces which have not been shut down, but those packets will be discarded. This means that modems connected to those interfaces will not be disconnected immediately, but modems coming online will not be able to obtain an IP address, download their configuration file, or renew their IP address assignment if the DHCP lease expires.

If you shut down a slave interface, only this shut down interface is affected.

Examples

See the following example to configure interface 25 to be the master interface:

Router(config-if)#cable bundle 25 master
Router(config-if)#
07:28:17: %UBR7200-5-UPDOWN: Interface Cable3/0 Port U0, changed state to down
07:28:18: %UBR7200-5-UPDOWN: Interface Cable3/0 Port U0, changed state to up
 

The following example shows the error message you get if you try to configure an interface with an IP address that is not the master interface:

Router(config-if)#cable bundle 5
Please remove ip address config first then reenter this command

Related Commands

show cable bundle

To display the forwarding table for the specified interface, use the show cable bundle privileged EXEC command.

Syntax Description

Default

No default behavior or values.

Command Mode

Privileged EXEC

Command History

Example

Router#show cable bundle 25 forwarding-table
MAC address         Interface
0050.7366.17ab      Cable3/0
0050.7366.1803      Cable3/0
0050.7366.1801      Cable3/0
 

Table 2 describes the fields shown in the show cable bundle display.

Related Commands

Posted: Fri Jan 28 19:36:43 PST 2000
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