[c-nsp] Why does PIM enable IGMP?

[Benjamin Lovell]

Turning on PIM also turns on the IGMP querier function so we therefor  
have turned on IGMP as query message is of type IGMP. I have never  
looked to see if we make a distinction between a multiaccess vlan  
interface and a point to point routed interface where it is not  
strictly needed but I assume we do not.

-Ben

On Feb 23, 2011, at 4:24 PM, John Neiberger wrote:

> IGMP is enabled automatically when you enable PIM on an interface and
> I can't figure out why. I've talked to a few other engineers and no
> one can thing of why IGMP would need to be enabled on a
> router-to-router connection running PIM. My only thought was that it
> was a leftover from PIMv1, which used IGMP type 14 packets, but that's
> a total guess.
>
> Do any of you happen to know the answer to this piece of trivia?
>
> Thanks!
> John
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