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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-03
Chapter3 Configuring Cable Modem Interface Features
Setting Optional IP Parameters (Broadcast and Multicast Echo)
Verifying IP Multicast Echo
To determine whether IP multicast echo is activated or deactivated, enter the
moresystem: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
Tip If you are having difficulty with verification, make sure that you entered the correct slot and port
numbers when you entered cable interface configuration mode.
Activating IP Broadcast Echo
By default, the CiscouBR7200series CMTS does not echo IP broadcast packets. To activate IP
broadcast echo, use the following command in cable interface configuration mode.
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
moresystem: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
Command Purpose
Router(config-if)# cable ip-broadcast-echo
Enables IP broadcast echo.