Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

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

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 igmp v2 Gi1/0/4, Po3

swnsaccess02#sh mac address-table multicast vlan 2017

Vlan Mac Address Type Ports

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


Shouldn't the mac-addresses that are used for forwarding och packets to 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?