just need some clarification on the roles of the RP, DR and Querier in regards to multicasting.
here is what i know (i think)
RP is used in pim sparse-mode and acts as kind of the central distribution point for the multicast stream. Anyone who wishes to receive the multicast needs to be registered with the RP. RP can be statically assigned or auto using the send-rp-announce and send-rp-discovery commands.
One question i have is, if using auto-rp, hows is the RP chosen, in all my labs it has been the router with the highest IP, so is this the case?
The querier is the router on the network that sends messages to see if any hosts are still interested in the multicast. It is the router with the lowest IP address. Correct?
Im confused as to the role of the DR... im assuming its similar to the DR in OSPF, but then that sounds very similar to the RP..
can someone please clarify these roles for me, or maybe point me to a link with a good description?