[pim] Re: Bootstrap Router Mechanism: Forwarding of non-preferred BSMs

Hi Alexander!

Alexander Gall wrote:
> On Mon, 14 May 2007 22:30:59 +0200, Mark Doll <doll@tm.uka.de> said:
>> First:
>> =====
>> Why do routers in state "Candidate BSR" forward non-preferred BSMs from the
>> elected BSR (and switch to state P-BSR), but routers in state "Accept
>> preferred" don't?
> 
> They do.  In the description of the event "Receive Preferred BSM" in
> section 3.1.4 it is stated that
> 
>           A Bootstrap message is also preferred if it is from the
>           current BSR with a lower weight than the previous BSM it
>           sent ...
> 
> for precisely this reason.  However, this is not evident if you just
> read the description of the event "Receive Non-preferred BSM".  To
> make this clear, I suggest to add a reference to this exception:
> 
>       Receive Non-preferred BSM
>            A Bootstrap message is received from a BSR that has lower
>            weight than the current BSR with the exception detailed
>            above. If a router is in P-BSR state, then it uses its own
>            weight as that of the current BSR.
> 

Thanks for your clarification. That makes sense and I think, too, all cases
are covered by the current spec. Nevertheless, I'm not shure, if your proposed
pointer to the exception is really clear enough. Maybe explicitly saying that
Receive Non-Preferred BSM (+) Receive Preferred BSM = Receive BSM? So maybe:

      Receive Non-preferred BSM
           A Bootstrap message other than a preferred Bootstrap message is
           received. That is a message from a BSR with a lower weight than
           the current BSR with the exception detailed above.  If a router is
           in P-BSR state, then it uses its own weight as that of the current
           BSR.

Mark.

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