Re: [pim] anycast-rp with pim (rfc4610) when an RP reboots

[Pekka Savola <pekkas at netcore.fi>]

On Wed, 14 Oct 2009, pavan_kurapati wrote:
> Wouldn't the problem be solved when a Null register is triggered 
> from the DR of RP1?
>
>   o If Null Registers are sent (Registers with an IP header and no IP
>     payload), they MUST be replicated to all of the RPs in the
>     Anycast-RP set so that source state remains alive for active
>     sources.

Yes -- but:

 - this helps only until the next null register is received
 - fom the PIM spec, I don't see the suggested interval between null 
registers and whether those are mandatory.

I was not arguing that the blackhole situation would last forever, but 
that it could be significant (let's say, in the order of 3-4 minutes).

--
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings