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Cisco CGMP and IGMP interaction

Posted on 2011-09-06
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Last Modified: 2012-05-12
Hi,
I am trying to understand on how multicast works exactly especially between cgmp and igmp in a  layer 2 environment when it is not setup correctly. I have illustrated a reference diagram for reference:

Multicast server ---> Cisco switch (CGMP) ---- Cisco 6500 (Only with IGMP/PIM enabled)----Cisco switch for clients (IGMP enabled)

When the multicast server send a join message to the multicast group; I am trying to underrstand if it may successfully advertise its group address since cgmp is not enabled on the Cisco 6500.

From my understanding, the cisco switch connected to the multicast server will forward the igmp join, however since the cisco 6500 is not setup for cgmp; it will not forward the cgmp join towards the switch and I am not sure if the clients may join the multicast group address created by the server?

Thanks.
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Question by:cwtang
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LVL 26

Expert Comment

by:Soulja
ID: 36491718
I believe you are correct the 6500 will need to support CGMP. See if you can enable it on the vlan interface that the traffic is coming in on.


interface vlan x
ip cgmp


Then do a sh ip igmp snooping vlan 11

Look for :

CGMP interoperability mode          : IGMP_CGMP
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Accepted Solution

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Soulja earned 1500 total points
ID: 36491767
On another note, I would think that a 6500 would recognize and support CGMP automatically. Have you already tried this scenario?
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Author Closing Comment

by:cwtang
ID: 36577751
Hi,
Thanks for the information. The setup was not perfomd. I did noticed that if ip cgmp is enabed on the Catalyst 6500 switch the mode changed to IGMP_CGMP, otherwise I believe the default mode is IGMP_ONLY.

Thanks for the assistance.
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