user manual

Configuring Headend Broadband Access Router Features
Setting Optional IP Parameters
MC-579
Cisco IOS Multiservice Applications Configuration Guide
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:
To disable IP multicast echo, enter the no cable ip-multicast-echo command 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-config command 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-multicast-echo
Enables IP multicast echo. This is the default.
Command Purpose
CMTS01(config-if)# cable ip-broadcast-echo
Enables IP broadcast echo.