From: Ben (ccieben@cox.net)
Date: Wed Feb 14 2007 - 20:13:34 ART
Hi,
In AutoRP - the MA uses the highest IP address of its RP candidates to
be the active RP.
In BSR - see this link:
http://www.netcraftsmen.net/welcher/papers/multicast04.html
To use Bootstrap Router, configure one or more candidate BSR's. These
should be well-placed, in the core of your network with good
connectivity. Configuration command:
ip pim bsr-candidate type number hash-mask-length [priority]
The type number part of this refers to the interface whose address is
used to identify the BSR. The hash-mask-length is how many bits of a
multicast group address to use before consulting a hash table of RP's.
The priority is for election as BSR. The hashing allows load balancing
across multiple RP's for a range of groups. Only one RP will be used for
each group, but the hashing will divide up which RP is used for which
group. The hashing scheme is deterministic, so that all routers will use
the same scheme and determine the same RP for each group.
HTH
Ben
deji500@hotmail.com wrote:
> Hi GS,
>
> Two routers have been configured as candidate Auto-RPs for the same multicast groups. R4 is elected as RP while R5 is backup. The configuration is the same on both and the IP PIM RP-ANNOUNCE-FILTER config on the mapping agent is the same for both Routers. I do not understand how R4 came to be the RP. Is it the IP address?
>
> Please any explanation would be greatly appreciated. Also if this was a BSR configuration, what would be different?
>
> Thanks
>
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