Re: SSM, RTCP, SAP

[Marshall Eubanks <tme@21rst-century.com>]

Dear Jon;

Jon Crowcroft wrote:
> 
> well, depends what GRA support is there, but one possibility for
> RTCP reports from receivers on an SSM tree is to design a new RTCP
> report (with GRA router alert) that is self describing w.r.t
> summarising responses routers (like PGM nack aggregation) reporting
> a summarised loss bitmap, a highest and lowest loss rate, and so
> forth...
> 

I could see where that might make a lot of sense in a TRACK
type RMT. Interesting.

Marshall

> In message <3AE007C3.CE356D66@21rst-century.com>, Marshall Eubanks typed:
> 
>  >>Dear Jon;
>  >>
>  >>   What did you have in mind ?
>  >>
>  >>         Marshall
>  >>
>  >>Jon Crowcroft wrote:
>  >>>
>  >>> what about a GRA solution?
>  >>>
>  >>> In message <200104192248.PAA15699@lorenzo-u10.cisco.com>, Lorenzo Vicisano ty
>  >>> ped:
>  >>>
>  >>>  >>Marshall,
>  >>>  >>
>  >>>  >>> > I don't know of anything similar for SAP, but I don't think we should
>  >>>  >>> > re-invent an ad-hoc routing protocol just for this. We should either
>  >>>  >>> > use the existing ASM multicast service, if present, or SSM + application
>  >>>  >>> > modifications (e.g. a set of relays that accept unicast SAP messages and
>  >>>  >>> > remulticast them. Relays will have all to listen to each other
>  >>>  >>> > announcements .. ect.. there are scalability concerns but seems feasible).
>  >>>  >>> >
>  >>>  >>>
>  >>>  >>> IMHO this should not be a new protocol - it could easily be handled at the ap
>  >>>  >>>plication layer.
>  >>>  >>> Running these relay's sounds like a commercial matter to me. I would NOT add
>  >>>  >>>any router
>  >>>  >>> type support for this.
>  >>>  >>
>  >>>  >>I had in mind an application-level solution too, no router support:
>  >>>  >>the router support is ASM, where available.
>  >>>  >>
>  >>>  >>     Lorenzo
>  >>>  >>
>  >>>
>  >>>  cheers
>  >>>
>  >>>    jon
>  >>
>  >>--
>  >>
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