RE: [pim] BSR update

["Venu Hemige" <venu.hemige at alcatel.com>]

> 
> Venu Hemige wrote:
> >
> > Wouldn't there be a problem if we do not do RPF check? Let's say
there
> > is more than one router starting up simultaneously. Both of them do
not
> > do RPF check for a short period of time. BSMs that are received on
that
> > interface and accepted without RPF check may be forwarded back on
that
> > interface (or may come from elsewhere to complete the loop). The
same
> > BSM may get forwarded multiple times in the network until the
routers
> > decide to start doing RPF check again.
> 
> I don't think this is a problem if a router only accepts one BSM like
> this.  Once the first BSM has been accepted all others should have to
> pass the RPF check.
> 

Ok, that might work.

> However, I'm not sure I like restarting routers forwarding these BSMs
> at all. Accepting but not forwarding.
> 

There could be split-LAN scenarios (like the one John Zwiebel points to
in the other email he just sent). In such a case, for the network to
converge to a consistent RP-SET, the router that accepts a better
preferred BSM should forward it to the rest of the split LAN. Is there a
harm in forwarding such BSMs?




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