Re: Use of SAP in a PIM SSM Network

[Jon Crowcroft <J.Crowcroft@cs.ucl.ac.uk>]

In message <200011142316.PAA29744@cisco.com>, Toerless Eckert typed:

 >>> I am trying to understand in a pure SSM network without any shared tree,
 >>> how would SAP operate? My understanding is that SAP is transmitting on a
 >>> shared tree. Does it mean that we always stuck with a PIM-SM shared
 >>> tree, even in a pure SSM network?
 
 >>I think you have a network without a shared tree and without SAP. You can
 >>of course use SSM to get SAP information, but the receivers need to know
 >>the address of the sources in the first place, which is a bit beyond the
 >>point of what SAP was meant for in the first place. SAP is nice to have
 >>in limited environments, but simply trying to broadcast directory information
 >>on a world-wide scale is not a scaling solution. Already today lots of
 >>SDP sessions are just made available via the web instead of SAP.

Toerless

either you have a well known ssm mcast addr per sap server or you have
a well known web page - same difference - 

the scaling: if yo ucan have 10,000 sessions of video, you can sure
happily have 10,000 session announcements.....

search engines: are not standard. sure, they are a _piece_ of the
picture.

 cheers

   jon