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Chapter 44
Configuring IP Multicast Routing
Command
Step 5
show ip igmp interface [interface-id]
Step 6
copy running-config startup-config
To return to the default setting, use the no ip igmp querier-timeout interface configuration command.
Changing the Maximum Query Response Time for IGMPv2
If you are using IGMPv2, you can change the maximum query response time advertised in IGMP
queries. The maximum query response time enables the switch to quickly detect that there are no more
directly connected group members on a LAN. Decreasing the value enables the switch to prune groups
faster.
Beginning in privileged EXEC mode, follow these steps to change the maximum query response time.
This procedure is optional.
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
ip igmp query-max-response-time
seconds
Step 4
end
Step 5
show ip igmp interface [interface-id]
Step 6
copy running-config startup-config
To return to the default setting, use the no ip igmp query-max-response-time interface configuration
command.
Configuring the Switch as a Statically Connected Member
Sometimes there is either no group member on a network segment or a host cannot report its group
membership by using IGMP. However, you might want multicast traffic to go to that network segment.
These are ways to pull multicast traffic down to a network segment:
•
•
OL-12247-04
Use the ip igmp join-group interface configuration command. With this method, the switch accepts
the multicast packets in addition to forwarding them. Accepting the multicast packets prevents the
switch from fast switching.
Use the ip igmp static-group interface configuration command. With this method, the switch does
not accept the packets itself, but only forwards them. This method enables fast switching. The
outgoing interface appears in the IGMP cache, but the switch itself is not a member, as evidenced
by lack of an L (local) flag in the multicast route entry.
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
Purpose
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Specify the interface to be configured, and enter interface configuration
mode.
Change the maximum query response time advertised in IGMP queries.
The default is 10 seconds. The range is 1 to 25.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Configuring Optional IGMP Features
44-43
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