ip cgmp proxy

From: ccie2be (ccie2be@nyc.rr.com)
Date: Mon Apr 11 2005 - 20:01:53 GMT-3

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Hi guys,
 
I'm trying to understand when to use the above command. I understand what
the interface command, ip cgmp, does but I'm not 100% on the proxy part.
 
Let me see if this example illustrates the use of this command. If not, I
hope someone will correct me.
 
 
R1 R2 R3
  | | |
|---------------------------------| <- vlan X
       |
    Cat 5k
 
Since the Cat 5k doesn't support igmp snooping (or it's a very bad to use
it), cgmp should be used instead.
 
Now, since there are 3 routers connected to vlan X, I could either
 
a) configure ip cgmp 3 times - once on each router's interface connecting
to vlan X or
 
b) configure ip cgmp proxy just once - on any router's interface connected
to vlan X
 
If I use option b, I negate the need to configure ip cgmp on the other 2
routers because the router where ip cgmp proxy is configured will send the
info the Cat5k needs on behalf of the other routers.
 
Is this correct?
 
Is there anything else I should be aware of when using ip cgmp proxy?
 
TIA, Tim

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