Re: PIM DR vs IGMP Querier

I apologize I hit send button before finishing with the email.

 Although both protocols are used for different purposes, it is my
 understanding that both, PIM DR and IGMP Querier, can signal SPT Trees
 on behalf of the multicast receivers on a shared medium when PIM SM
is in use. Is this
 correct?

 If this is correct, the following question arises. Lets assume the
 following scenario

 ------------------------------
        | |
      R1 R2
        \ /
         \ /
           \ /
             \ /
               \ /
                 \ /
                    RP

If all IGMP and PIM parameters are left to the default, one of this
routers will become the IGMP Querier, lets say R1, and the other one
will become the PIM DR, lets say R2, so both will signal the SPT Trees
for the groups on the shared segment. Since both routers signaled the
SPT Tree, then both routers will forward the same multicast data on
the segment and the assert procedure will take place. Assuming R2 has
a better metric to the source it will become the assert winner and R1
will prune its LAN interface from the OIL.

Is this understanding correct?
Am I missing anything here?

I appreciate your inputs.

Thanks,
Jorge

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Received on Thu Jun 10 2010 - 12:33:19 ART