From: Geert Nijs (geert.nijs@simac.be)
Date: Tue Oct 12 2004 - 10:43:44 GMT-3
If i am not mistaken, this 'hash' value is used to devide the load of different groups among different RP, based on the group address.
Groups with the same hash bits get the same RP.
For example, if i am using a HASH value of 2 bits, the groups are divided as follows:
224.5.5.0, last bits: 00, RP A
224.5.5.4
224.5.5.8
224.5.5.12
224.5.5.1, last bits: 01, RP B
224.5.5.5
224.5.5.9
224.5.5.13
224.5.5.2, last bits: 10, RP C
224.5.5.6
224.5.5.10
224.5.5.14
224.5.5.3, last bits: 11, RP D
224.5.5.7
224.5.5.11
224.5.5.13
Correct me if i am wrong,
Regards,
Geert #13729
________________________________
From: nobody@groupstudy.com on behalf of Peter Ding
Sent: Tue 10/12/2004 2:24
To: ccielab@groupstudy.com
Subject: BSR harsh value
I don't understand how to use hash-mask-length in the "ip pim bsr-candidate"
cmd. Here is the explanation of the use of hash-mask-length in this command.
hash-mask-length:
(Optional) 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.
If I have a group 239.20.7.13, how can I derive a hash value?
Thanks,
PD
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