Re: Hash Mask Length in BSR

The hash calculation allows all routers to consistently select the same C-RP
as the RP for a given multicast group, whilst also potentially allowing
other RP addresses to be used throughout the network for other multicast
groups (to spread the load).

The mask is compared against the group address, and tweaks the algorithm to
allow some consecutive groups addresses to map to the same RP.

You'll find most production networks use static RP assignments, not BSR.
 Multicast software bugs have bitten many networks, and people like to keep
their deployments simple.

RFC4601 4.7.2 has the full details, but you certainly won't need the
equation for the lab. :)
This RFC is very well written, and the early sections are worth reading. It
actually provides a clearer (as well as a more accurate) explanation of
multicast than many books on the subject.

Paul.

On Thu, Sep 29, 2011 at 9:49 AM, Routing Freak <routingfreak_at_gmail.com>wrote:

> Hi fellas,
>
> I was doing labs in BSR mode in Multicast and came across a thing called
> as
> Hash Mask Length in PIM BSR mode. Can anyone explain me what is the
> function
> of Hash Mask length and why we should configure it in real time network. Is
> it should be synchronised when u configure in ur network?
> Thank You
>
>
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Received on Sun Oct 02 2011 - 19:06:05 ART