All things related to multicast

[John Meylor <>]

Gordon Rogier wrote:
> 
> i have a generic question about this subject.  if a mcast domain
> runs a specific group as truely dense locally (by not defining an RP
> for the group address), does this prevent msdp from being aware of an
> active source (thereby preventing the needed SA message from being
> generated)?  

there are several ways to originate sa-messages for dense sources,
but first I'll say that if a network runs in sparse mode I can't
think of any reason to force a group into dense mode - I've never
seen a valid reason for that, and the concept that it should be
done to handle "bursty-sources" eg SAP is pre-mature at best, 
there's no evidence SAP doesn't work when all varibles are addressed.
properly (like config, bugs, etc).

 So what we're talking about is how to get sources in dense-only
mode  into msdp.  The preferred way is to have a border router
on the dense<->sparse interface (say to the sparse backbone)
proxy-register to the sparse cloud's RP.

if so, it would seem that almost all groups in the wide area
> would need to be supported as sparse in the local domain.

Ideally, but again, if the site "can't" run sparse, the sources
inside that dense-only cloud would need to proxy register to
the sparse clouds RP.

 John

> 
> --*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*--
> Gordon Rogier                        
> 
> Network Engineer                     785-864-0381wk 785-550-4468 cell
> Great Plains Network                 785-864-9330 FAX
> 
> On Thu, 23 Dec 1999, Kevin C. Almeroth wrote:
> 
> > (I sent this to JUST 
> > 
> >  since all
> > the folks I know who are involved in this discussion are
> > on this list.)
> >
> >
> > Well, I've been not paying attention to email for a few days
> > (Rincon fire almost claimed to-be parents-in-law house (things
> > are 99.9% fine)).
> >
> > Based on the fragments of messages I've been getting I think
> > it should be noted that SOME folks run SAP over dense.
> >
> > (For anyone that doesn't know, there was a question whether
> > the transport of SAP messages should be done via dense mode.)
> >
> > Does I2 need to even recognize that this is happening?  Does it
> > help someone connected to I2 to know that some folks carry
> > sap.mcast.net via dense?
> >
> > -Kevin
> >
> >