From: Ivan (ivan@iip.net)
Date: Sat Nov 04 2006 - 17:22:22 ART
RP for a group is selected from the set of C-RP's that have advertised. The
same hashing algorithm used to select RP from the set of C-RP. Since all
router used the same algorithm, all routers selecft the same RP. The hashing
algorith permit multiple C-RP to load balance the RP across a range of
groups. Hashing algorithm can choose different RP from C-RP for another group
within the group range.
For instance, hash length 30 bits (this means 2-bits or 4 groups per RP). If
router A and B both announce their candidacy for 239.1.1/24. And hash
algorithm choose A-RP for 239.1.1.0,1,2,3 and B-RP for 239.1.1.4,5,6,7. May
be distribution will be the other.
On Saturday 04 November 2006 01:26, Adhu Ajit wrote:
> Folks,
>
> ip pim bsr-candidate [intf] [hash-mask-length] [priority}
>
> I looked this up in the Cisco CD and I got:
>
> hash-mask-length: Length of a mask (32 bits maximum) that is to be ANDed
> with the group address before the hash function is called. All groups with
> the same seed hash (correspond) to the same RP. For example, if this value
> is 24, only the first 24 bits of the group addresses matter. This fact
> allows you to get one RP for multiple groups.
>
>
> I dont fully understand this option. Can someone please explain with an
> example ?
>
> Thanks,
> Adhu.
>
>
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-- Ivan
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