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Configuring IP Multicast Routing
Configuring Optional IGMP Features
DETAILED STEPS
To return to the default setting, use the no ip igmp query-max-response-time interface configuration command.
EXAMPLE
The following example configures a maximum response time of 8 seconds:
ip igmp query-max-response-time 8
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:
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.
This procedure is optional.
BEFORE YOU BEGIN
If you configure the ip igmp join-group command for the same group address as the ip igmp static-group command,
the ip igmp join-group command takes precedence, and the group behaves like a locally joined group.
Command Purpose
1. configure terminal Enter global configuration mode.
2. interface interface-id Specify the interface to be configured, and enter interface
configuration mode.
3. no shutdown Enable the port, if necessary. By default, UNIs and ENIs are
disabled, and NNIs are enabled.
4. ip igmp
query-max-response-time
seconds
Change the maximum query response time advertised in IGMP
queries.
The default is 10 seconds. The range is 1 to 25.
5. end Return to privileged EXEC mode.
6. show ip igmp interface
[interface-id]
Verify your entries.
7. copy running-config
startup-config
(Optional) Save your entries in the configuration file.
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