Re: multicast sparse mode

From: John Galt Kupec (jkupec2@xxxxxxxxxx)
Date: Wed Aug 02 2000 - 21:43:18 GMT-3


   
Brian Edwards wrote:
>
> It is working correctly. You will get a single response from each router
> that has the "join-group" statement. The response will use the outgoing
> interface as the source address.

Yes, I think I stand corrected- it would be responding using the output
interface address. If you had another router on RTRA's Ethernet segment
IGMP-joined then that E0 should respond with it's IP address.

>
> The significance of configuring "join-group" on a particular interface is
> that it will respond to IGMP group membership queries from other routers on
> that network (not sure why this is necessary b/c it will also send PIM
> Join/Prune messages). Maybe this is important if the router with
> "join-group" is not the PIM DR for the network.

I look at it mainly as a troubleshooting tool. It's not really
necessary
as far as I know. It gives you something to ping...



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