ACCEPT-RP

All

I am struggling to understand exactly what the following command does.

ip pim accept-rp <rp-address|auto-rp>

The Documentation says:

 rp-address
RP address of the RP allowed to send join messages to groups in the
range specified by the group access list.

auto-rp
Accepts join and register messages only for RPs that are in the Auto-RP cache.

For the RP-address what does this even mean? The RP does not send join
messages right? A join message here is an IGMP message i take it?

For the auto-rp it says it accepts "join" and "register" messages.
Here I take it that a "join" is an IGMP message and that a "register"
is a source trying to register with the RP?

Please can anyone shed any light as to what exactly the whole point is?

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Received on Wed Oct 20 2010 - 07:41:14 ART