Hi Ive been reading through one of my CCNP pamphlets and it mentions CGMP:

qns1. What does is stand for?
qns2. What is it about?
qns3. What is it for?
Who is Participating?
rochey2009Connect With a Mentor Commented:

It stands for Cisco Group Management Protocol (CGMP). It is used to help a switch decide which switch ports are members of which multicast groups so that traffic for each multicast group is forwarded to the devices that have joined a particular multicast stream. It does the same thing as IGMP but in a different way.
mikey250Author Commented:
I was thinking it was 'CG Multicast Group' - Presumably name change!!!
Don JohnstonConnect With a Mentor InstructorCommented:
I usually tell people that it's the equivalent of IGMP snooping.

Although, with that "C" in front, you just know that it's pretty much a Cisco only thing. :-)
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