Re: [pim] PIM Join/Prune Messages

["Christopher Thomas Brown" <ctbrown at nexthop.com>]

Nikhil Ninan wrote:
> >-----Original Message-----
> >From: Nikhil Ninan [mailto:nikhil at erg.abdn.ac.uk]
> >Sent: 03 April 2006 11:25
> >To: pim at ietf.org
> >Subject: [pim] PIM Join/Prune Messages
> >
> >
> >Hello there,
> >                Could someone tell me how does PIM combine group 
> >information, i.e. no. of joins and no. of prunes, on a group by group 
> >basis onto a single Join/Prune message.
> >Cheers
> >Nikhil
> >
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> >pim at ietf.org
> >https://www1.ietf.org/mailman/listinfo/pim
> >
> >
> >
> >  
> my question is about the logic not the format :-)
> Cheers
> Nikhil


The only logic that the PIM-SM specification requires is that (S,G,rpt)
prunes for a given group must be contained in the same message as the
(*,G) join for that group. The spec also says which prunes to include if
not all of them fit in the same message.

Other than that, its implementation dependent on how one packs joins
into the periodic message.  The message format only allows up to 255
different groups. I would suggest filling a message up to the point
where it is just under or at the link MTU size (to avoid IP
fragmentaion) and spred out your messages across the interval.

Chris

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