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IP igmp snooping timers

Hello,

what is the difference between these 2 commands? When would I use one versus the other?

ip igmp snooping querier timeout expiry xx

ip igmp snooping last-member-query interval xx

Thanks!

1 REPLY
Hall of Fame Super Silver

Re: IP igmp snooping timers

Hello Angelique,

the first one should refer to the timer to wait before treating the current querier (the router that sends out on the vlan IGMP queries every 60 seconds) as down.

see

http://www.cisco.com/en/US/docs/ios/ipmulti/command/reference/imc_02.html#wp1029055

for the second: the router tracks for each multicast group the ip address of the last host that has sent an IGMP report ( it doesn't track all the hosts also because igmp reports are suppressed by hosts).

if an IGMP leave is received for a group from last reporter the router wants to check if there is somebody else interested in that multicast group so it should send out a query for that group.

see

http://www.cisco.com/en/US/docs/ios/ipmulti/command/reference/imc_02.html#wp1012354

Hope to help

Giuseppe

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