From: Hobbs (deadheadblues@gmail.com)
Date: Tue Dec 02 2008 - 22:01:57 ARST
I have never understood the hash length argument. I always though the hash
would be on the number of c-RP's...
1 RP = 1 bit hash
2 or 3 RP's = 2 bit hash
4,5,6,7 RP's = 3 bit hash
On 12/2/08, Bob Sinclair <bob@bobsinclair.net> wrote:
>
> I understand your question to be about the hash-mask-length parameter in
> the bsr-candidate command. The most thorough discussion I have found is in
> RFC 2362, section 3.7:
>
> partial quote:
>
> The hash function is used by all routers within a domain, to map a
> group to one of the C-RPs from the RP-Set. For a particular group, G,
> the hash function uses only those C-RPs whose Group-prefix covers G.
> The algorithm takes as input the group address, and the addresses of
> the Candidate RPs, and gives as output one RP address to be used.
>
> end quote.
>
> That is the theory. In labbing this up using various values I have not
> been able to demonstrate any practical effect.
>
> Hope that helps,
>
> -Bob Sinclair CCIE 10427 CCSI 30427
> www.netmasterclass.net
>
> mihai.grigore@onlinehome.de wrote:
>
>> Fellow EXPERTS,
>>
>> can someone explain the command option hash below?
>>
>> ip pim [vrf vrf-name] bsr-candidate interface-type interface-number
>> [hash-mask-length] [priority]
>> Thank you in advance for your replies.
>>
>>
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>
>
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