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Community Member

Problem in configuring CGMP on switches

Hi,

I decided to implement CGMP rather than IGMP Snooping to prevent mcast flooding on switches. This seems easy to configure when you have last hop router,ONE switch and than receiver. But, how to configure CGMP when you have TWO L2 switches before receiver, like on this scheme ? Can you configure CGMP on both switch ?

Router -> Switch -> Switch -> Receiver

Thanks.

Danijela

3 REPLIES

Re: Problem in configuring CGMP on switches

YES.

You should enable CGMP on ALL switches in your LAN.

HTH,

Milan

Community Member

Re: Problem in configuring CGMP on switches

IGMP snooping is better than CGMP. you can either CGMP/IGMP snooping in your topology.

Community Member

Re: Problem in configuring CGMP on switches

Could you tell me why in your opinion is ICMP snooping is better?

I've read that when you enable IGMP Snooping then switch listen to ALL layer 2 multicast packets in order to identify IGMP packet. This can have a significant impact on the switch’s performance. That was the reason why I decided to use CGMP.

Danijela

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