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

[Pekka Savola <pekkas at netcore.fi>]

On Wed, 14 Oct 2009, Prashant Jhingran (pjhingra) wrote:
> - As long as RP_2 remains down there would not be an issue
> - However once RP_2 becomes operational then with the help of NULL
> Registers (default every 60 sec or so), the black hole should get
> patched up in < 2 mins
> - Also note that black hole would be created for only new/upcoming
> receivers i.e. those behind RP_2 during this transient time
> - Recv behind RP_2 which would have ideally switched to SG would remain
> unaffected.

Good points, thanks for summarizing.  However, I'm not sure if I see 
the third point.  I see this is the case if the receiver had switched 
to SG but otherwise..?

Another thing I noted is that if there are sources directly connected 
to an RP, with anycast-RP using PIM it's not enough to copy/replicate 
received register messages to other to the rest of the RP set.  In 
this case, you will need to create register messages yourself.  In 
some vendors' equipment this may be an issue and it might be 
interesting to see if all the anycast-rp+pim implementations handle 
this correctly.

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