A rendezvous point configured as a ‘Candidate Rendezvous Point’ or C-RP, advertises via an RP announcement message that it is willing to become a rendezvous point.
The candidate rendezvous point advertises this willingness every 60 seconds by default to the multicast address 224.0.1.39. This is controlled by the rendezvous point announce interval.
The announcement message contains three parts, the default group range of 224.0.0.0/4, the candidate rendezvous points address, and the hold timer.
The hold timer is three times that of the rendezvous point announcement interval.
If multiple candidate rendezvous points are advertising their ability to become a rendezvous point, then the rendezvous point with the highest IP address is selected as the preferred rendezvous point.
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