IGMP Overview 65

the switch is configured to perform IGMP snooping and there is no other reliable querier on the network.

IGMP configuration commands are described in Table 18.

Table 18 IGMP Configuration Commands

Command

Description

 

 

enable igmp {vlan <name>}

Enables IGMP. If no VLAN is specified, IGMP is

 

enabled on all interfaces. The default setting is

 

enabled.

enable igmp snooping

Enables IGMP snooping on the switch. If

{forward-mcrouter-only}

forward-mcrouter-only is specified, the

 

switch forwards all multicast traffic to the

 

multicast router, only. Otherwise, the switch

 

forwards all multicast traffic to any IP router.

config igmp <query_interval> <query_response_interval> <last_member_query_interval>

Configures the IGMP timers. Timers are based on RFC2236. Specify the following:

query_interval — The amount of time, in seconds, the system waits between sending out General Queries. The range is 1 to 2,147,483,647 seconds (68 years). The default setting is 125 seconds.

query_response_interval — The maximum response time inserted into the periodic General Queries. The range is 1 to 25 seconds. The default setting is 10 seconds.

last_member_query_interval — The maximum response time inserted into a Group-Specific Query sent in response to a Leave group message. The range is 1 to 25 seconds. The default setting is 1 second.

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3Com 9100 manual Enable igmp vlan name, Enable igmp snooping, Forward-mcrouter-only Forward-mcrouter-only is specified