Cisco Systems uBR7200 Activating IP Multicast Echo, Activating IP Broadcast Echo, MC-579, Command

Configuring Headend Broadband Access Router Features

Setting Optional IP Parameters

Activating IP Multicast Echo

The Cisco uBR7200 series echoes IP multicast packets by default. To activate IP multicast echo if it has been previously disabled, use the following command in cable interface configuration mode:

Command	Purpose
CMTS01(config-if)#cable ip-multicast-echo	Enables IP multicast echo. This is the default.

To disable IP multicast echo, enter the no cable ip-multicast-echocommand in cable interface configuration mode.

Verifying IP Multicast Echo

To verify whether IP multicast echo has been activated or deactivated, enter the more system:running-configcommand and look for the cable interface configuration information. If IP multicast echo is activated, there is no notation in the output as this is the default setting. If IP multicast echo has been deactivated, a notation appears in the output as shown in the following command output excerpt:

CMTS01# more system:running-config

Building configuration...

Current configuration:

!

interface Cable6/0

ip address 1.1.1.1 255.255.255.0 no keepalive

no cable ip-multicast-echo cable insertion-interval 150000 cable downstream annex B

cable downstream modulation 64qam cable downstream interleave-depth 32 cable downstream symbol-rate 5056941 cable upstream 0 frequency 15008000 cable upstream 0 fec

cable upstream 0 scrambler no cable upstream 0 shutdown

Troubleshooting Tips

To troubleshoot the configuration, make sure you entered the correct slot and port numbers when you entered cable interface configuration mode.

Activating IP Broadcast Echo

By default, the Cisco uBR7200 series does not echo IP broadcast packets. To activate IP broadcast echo, use the following command in cable interface configuration mode:

Command	Purpose
CMTS01(config-if)#cable ip-broadcast-echo	Enables IP broadcast echo.

Cisco IOS Multiservice Applications Configuration Guide

MC-579