Multicast:Confirming understanding IGMP Snooping vs CGMP

Answered Question
Jul 7th, 2009

Hi folks, just want to confirm I understanding this right:

In a modern network, where I am planning to replace access-layer switches with Cisco 3750's - or perhaps even non Cisco switches in certain locations - I could and should just forget CGMP, since that is proprietary.

So my approach is to explore IGMP snooping on access-layer switches. I understand I need to test how that will play with igmp3 since that is how my distribution layer 3 switches are configured.

Is my understanding right?

I have this problem too.
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Correct Answer by Jon Marshall about 7 years 6 months ago

Marlon

If you have a choice between CGMP and IGMP snooping then i would choose IGMP snooping. Apart from the issue you mention about CGMP being Cisco proprietary, IGMP snooping is more efficient on a switch as it is implemented in hardware.

So yes, use IGMP snooping over CGMP.

Jon

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Correct Answer
Jon Marshall Tue, 07/07/2009 - 13:58

Marlon

If you have a choice between CGMP and IGMP snooping then i would choose IGMP snooping. Apart from the issue you mention about CGMP being Cisco proprietary, IGMP snooping is more efficient on a switch as it is implemented in hardware.

So yes, use IGMP snooping over CGMP.

Jon

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