Any suggestion on how to debug ip igmp without problems?

Unanswered Question
Jan 26th, 2010
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Imagine I want to find out what type of queries (IGMPv1, v2 or v3) receivers are sending.


I am afraid that if I do 'debug ip igmp' I may overhelm the router.


So I thought about limiting the debug ip igmp output by filtering using access-list or at least vlan 3 traffic only (which is the one I want to study anyway).


I see 'filter' and 'max-groups' and I read the documentation but I do not see exactly how this will filter traffic. I don't see a way for me to use access-list using 'debug ip igmp'.


Any ideas on how to filter traffic only to debug traffic for one specific vlan? I just want to make sure I will not impact production if I debug this. But maybe if there are too many receivers on vlan 3, that may impact performance anyway.


Any suggestions on how to handle this debug without causing production problems?



3750L3#show ip igmp group
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter   Group Accounted
239.100.2.2      Vlan10                   13w6d     stopped   10.3.35.34
239.100.2.4      Vlan10                   4d08h     stopped   10.3.35.43
239.254.11.4     Vlan3                    13w6d     stopped   10.3.32.10
239.254.11.7     Vlan6                    13w6d     stopped   10.3.38.10
239.254.11.10    Vlan8                    13w6d     stopped   10.3.40.10
239.254.11.22    Vlan6                    13w6d     stopped   10.3.38.11
239.254.11.24    Vlan8                    13w6d     stopped   10.3.40.10
239.254.10.24    Vlan3                    13w6d     stopped   10.3.32.11
239.254.12.1     Vlan6                    13w6d     stopped   10.3.38.201
3750L3#debug ip igmp ?
  filter      Filter events
  max-groups  Max-groups events
  snooping    IGMP snooping activity
  vrf         Select VPN Routing/Forwarding instance
  <cr>

3750L3#debug ip igmp ?

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