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Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter44 Configuring IP Multicast Routi ng Configuring Optional IGMP Features
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 que ry resp onse time ad vertised i n IG MP
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 enab les the sw it ch t o prune gr ou ps
faster.
Beginning in privileged EXEC mode, follow these steps to change the maximu m qu er y respon se tim e.
This procedure is optional.
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 segmen t or a h ost ca nno t re po rt i ts g ro up
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, th e switch acc epts
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.
Step5 show ip igmp interface [interface-id] Verify your entries.
Step6 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 interface interface-id Specify the interface to be configured, and enter interface configuration
mode.
Step3 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.
Step4 end Return to privileged EXEC mode.
Step5 show ip igmp interface [interface-id] Verify your entries.
Step6 copy running-config startup-config (Optional) Save your entries in the configuration file.