All things related to multicast

[Bill Owens <>]

On Fri, Mar 24, 2006 at 12:21:02PM -0500, Richard Mavrogeanes wrote:
> The SDP, especially for MPEG4, became too big (there is a LOT of stuff
> required to be fully standards compliant for MPEG4) and we implemented
> SDP compression (indeed, as the standards allow). I guess cisco does not
> fully follow the standard?

I suspect that Cisco (and probably Juniper as well) added SAP reception as 
more or less an afterthought, to help folks with troubleshooting. Certainly 
they've both had serious bugs in that part of their code, and the use of the 
feature has caused problems with CPU usage as well. So I think both of them 
are likely in the mode of use it when you have to, turn if off the rest of 
the time. And I doubt either one would be interested in adding compressed SDP 
support; certainly I'm not going to bother to ask them. 

It would be nice if Ethereal handled it, and since it already uses zlib to 
read compressed trace files the bits of code ought to be available. It would 
just need someone to write it, which I, sadly, cannot. . .

Bill.