Activating Ip Broadcast Echo - Cisco 7246VXR - uBR Router Software Configuration Manual

Setting Optional IP Parameters (Broadcast and Multicast Echo)
Verifying IP Multicast Echo
To determine whether IP multicast echo is activated or deactivated, enter the
more system:running-config command, and look for the cable interface configuration information. If
IP multicast echo is activated, there is no notation in the output, because this is the default setting. If IP
multicast echo is deactivated, a notation appears in the output:
Router# more system:running-config
Building configuration...
Current configuration:
!
interface cable5/0
ip address 1.1.1.1 255.255.255.0
no keepalive
no cable ip-multicast-echo
cable downstream annex B
cable downstream modulation 64qam
cable downstream interleave-depth 32
cable upstream 0 frequency 15008000
no cable upstream 0 shutdown
If you are having difficulty with verification, make sure that you entered the correct slot and port
Tip
numbers when you entered cable interface configuration mode.

Activating IP Broadcast Echo

By default, the Cisco uBR7200 series CMTS does not echo IP broadcast packets. To activate IP
broadcast echo, use the following command in cable interface configuration mode.
Command
Router(config-if)# cable ip-broadcast-echo
To disable IP broadcast echo when it is enabled, enter the no cable ip-broadcast-echo command in cable
interface configuration mode.
Verifying IP Broadcast Echo
To determine whether IP broadcast echo is activated or deactivated, enter the
more system:running-config command and look for a notation in the cable interface configuration
information:
Router# more system:running-config
Building configuration...
Current configuration:
!
interface cable5/0
ip address 1.1.1.1 255.255.255.0
no keepalive
cable ip-broadcast-echo
cable downstream annex B
cable downstream modulation 64qam
cable downstream interleave-depth 32
cable upstream 0 frequency 15008000
no cable upstream 0 shutdown
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
3-34
Chapter 3 Configuring Cable Modem Interface Features
Purpose
Enables IP broadcast echo.
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