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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-03
Chapter3 Configuring Cable Modem Interface Features
Configuring Cable Subinterfaces
! first subinterface
interface cable5/0.1
description Management Subinterface
ip address 10.255.1.1 255.255.255.0
cable helper-address 10.151.129.2
! second subinterface
interface cable5/0.2
ip address 10.279.4.2 255.255.255.0
cable helper-address 10.151.129.2
! third subinterface
interface cable5/0.3
ip address 10.254.5.2 255.255.255.0
cable helper-address 10.151.129.2
Subinterface Definition on Bundle Master Example
The following example shows how to define subinterfaces on a bundle master and define Layer 3
configurations for each subinterface. In this example, the interfaces int c5/0 and int c4/0 are bundled.
int c5/0
! No IP address
! MAC level configuration only
cable bundle 1 master
int c4/0
! No IP address
! MAC layer configuration
cable bundle 1
! first subinterface
int c5/0.1
ip address 10.22.64.0 255.255.255.0
cable helper-address 10.4.1.2
! second subinterface
int c5/0.2
ip address 10.12.39.0 255.255.255.0
cable helper-address 10.4.1.2
! third subinterface
int c5/0.3
ip address 10.96.3.0 255.255.255.0
cable helper-address 10.4.1.2
Configuring and Monitoring Cable Interface Bundling
Cable interface bundling allows you to reduce the number of subnets consumed per Cisco uBR7200
series. Multiple cable interfaces can share a single IP subnet. An IP subnet is required for each bundle.
You can bundle all cable interfaces on a Cisco uBR7200 series into a single bundle.
Using the CLI, first configure a master interface for a cable interface bundle. The master interface has
an IP address assigned and is visible for IP routing functionality. After you configure the master
interface, add additional cable interfaces to the same interface bundle. Those interfaces must not have
an IP address assigned. You can also configure multiple bundle interfaces.
You can configure up to four interface bundles. In each bundle, specify exactly one interface as the
master interface, using the "master" keyword. In the case of a subinterface over a cable bundle, `x' is the
interface number of the bundle master [1]. The subinterface number starts from 1.
Caution Configure an IP address on the master interface only. An attempt to add an interface to a bundle will be
rejected if an IP address is configured and the interface is not specified as a master interface.
When bundling cable interfaces, only the interface configured to be the bundle master is allowed to have
subinterfaces. An interface that has subinterface(s) defined over it will not be allowed to be part of a bundle.
MIB objects on cable interface bundles are not supported as of the date of this publication.