Monitor session problem

Answered Question
Oct 16th, 2007

Trying to monitor IGMP replies with a packet sniffer attached to G 1/0/11 of a Catalyst 3750.

Devices processing multicast streams attached to G 1/0/1 through G 1/0/8 (devices are receiving/processing multicast streams.

Monitor session 1 config:

Mon session 1 source int G 1/0/1 both

Mon session 1 source int G 1/0/2-3, 1/0/7-8 rx

Mon session 1 desination int g 1/0/11.

I am able to see IGMP reports from the switch and my packetsniffer/PC, as well as the IGMP queries from the switch, but cannot see any IGMP reports from the devices atttached to ports 1-3 or 7-8.

This configuration worked on an older catalyst 3550, but will not work on the 3750.

Suggestions?

Thanks

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Correct Answer by ilya.varlashkin about 9 years 3 months ago

could it be that IGMP snooping was enabled on 3550 and disabled on your 3750?

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Correct Answer
ilya.varlashkin Tue, 10/16/2007 - 12:27

could it be that IGMP snooping was enabled on 3550 and disabled on your 3750?

spassen55 Wed, 10/17/2007 - 06:00

Thanks.

It was actually reversed, snooping was enabled, disabling it and my mon session started recording IGMP reports from my hosts.

Guess I'll do some reading on snooping settings.

Thanks again

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