How to find mac-address corresponding to IGMP snooping entries.

Unanswered Question
Mar 18th, 2009

Problem on a couple of 3750-E running 12.2(46)SE to find the multicast mac-addresses that corresponds to IGMP-entries.

swnsaccess02#sh ip igmp snooping groups

Vlan Group Type Version Port List

-----------------------------------------------------------------------

2017 239.255.255.253 igmp v2 Gi1/0/4, Po3

swnsaccess02#sh mac address-table multicast vlan 2017

Vlan Mac Address Type Ports

---- ----------- ---- -----

swnsaccess02#

Shouldn't the mac-addresses that are used for forwarding och packets to 239.255.255.253 show up? Is there any other way for the switch to know to which ports it should forward these frames out? Or is it flooding??

If I try the same commands on an old 2950 I can see the dest multicast macs with the same commands without problems.

Any clue to the missing entries?

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