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Chapter 3
Configuring Cable Modem Interface Features
Generic cable interface configuration such as source verify or ARP handling will apply to subinterfaces as well.
Tip
If a physical interface goes down, the associated subinterface will also go down. If the subinterface is
Note
defined over the cable bundle and the bundle master is shut down or removed, no data packets will be
sent to any of the subinterfaces defined over it. Packets will still be received from non-master interfaces,
but will be dropped.
Using Interface Bundling Commands
Use the following commands to configure and view cable interface bundles in privileged EXEC mode:
Command
Router(config-if)# cable bundle n master
Router# show cable bundle n forwarding-table
Configuration Guidelines
Use the cable bundle interface configuration command to configure a cable interface to belong to a
bundle. Specify the bundle identifier—1 to 255. Optionally define the specified interface as the master.
Specify IP networking information, including IP address, routing protocols, and switching modes, on the
bundle master. 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 are 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 cable modems connected to
those interfaces will not be disconnected immediately, but CMs coming online will not be able to obtain
an IP address, download their DOCSIS configuration file, or renew their IP address assignment if the
DHCP lease expires.
If you shut down a slave interface, only the specific interface is affected.
Cable Interface Bundling Examples
In the following configuration example, interface 25 is configured as the master interface in the bundle:
OL-2239-03
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
Configuring Cable Subinterfaces
Purpose
Configures the interface n to be the master
interface in a bundle. Valid range is 1 to 255.
Displays the forwarding table for the specified
interface.
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