Cell Relay Archive

["Michael D. Todd" <toddmd@aur.alcatel.com>]

I assume you are talking about point-to-multipoint which 
is supported in Uni 3.1 & Uni 4.0. Pt2multipt is unidirectional 
(root UNI multicasts cells to leaf members.) I can't see how 
pt2mpt would work in a IP/ATM env. First, an IP/ATM (RFC1577) 
endpoint has a VC to each endpoint/IP address it talks to and 
needs bidirectional VCs (ping expects a reply, TCP has end2end flow
control.) 
Second, IP/ATM encodes the VP/VC as a MAC address & puts it 
in the ARP table. If you have a VP/VC that corresponds to 
several endpoints & therefore IP addresses, I'm not sure how 
ARP would work. Maybe theres some way to couple multicast IP 
addresses to multicast VCs, but I don't know of an RFC which 
extends 1577 (maybe something like 2225 now.)


mredondo@my-deja.com wrote:
> 
> Hi, all
> I´m looking for information about setting multicast groups dynamically
> in a IP-over-ATM enviroment. I think UNI 4.0 supports native multicast,
> but I´m not sure if there are any ATM switches that suport this feature.
> Is it possible to create a IP-over-ATM multicast network for audio
> conferencing?
> Is there anything already developed?
> Thanks in advance
> 
> Miguel Redondo
> mredondo@idecnet.com
> 
> Sent via Deja.com http://www.deja.com/
> Before you buy.

-- 
Mike

Michael Todd; Alcatel USA; Raleigh, NC USA