From: Yasser Abdullah (yasser@alharbitelecom.com)
Date: Wed Apr 21 2004 - 09:57:35 GMT-3
From the command reference guide:
"If multipoint signaling is enabled, the router uses existing static map
entries that have the broadcast keyword set to establish multipoint
calls. One call is established for each logical subnet of each protocol.
All destinations are added to the call. One multicast packet is sent to
the ATM switch for each multipoint call. The ATM switch replicates the
packet to all destinations.
"
Brgds,
Yasser
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Tim Last
Sent: Wednesday, April 21, 2004 3:17 PM
To: Group Study
Subject: Multicast support on ATM
Good morning all,
I'm trying to understand when the following command is required,
atm multipoint-signaling
In particular, I want to know if that command is required to run routing
protocols, like Eigrp, which use multicast to form adjacencies with
neighbors over ATM. I thought that when the broadcast keyword is used,
that allows both broadcast AND Multicast traffic. Am I wrong?
Does it depend if it's a PVC or SVC being used to connect to the
neighbor?
Please help me understand. Thank you in advanced. Tim
According to the Doc CD,
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
fwan_c/wcfatm.htm#1001753
Configuring Point-to-Multipoint Signalling
Point-to-multipoint signalling (or multicasting) allows the router to
send one packet to the ATM switch and have the switch replicate the
packet to the destinations. It replaces pseudobroadcasting on specified
virtual circuits for protocols configured for broadcasting.
You can configure multipoint signalling on an ATM interface after you
have mapped protocol addresses to NSAPs and configured one or more
protocols for broadcasting.
After multipoint signalling is set, the router uses the SVC
configurations that have the broadcast keyword set to establish
multipoint calls. The call is established to the first destination with
a Setup message. Additional parties are added to the call with AddParty
messages each time a multicast packet is sent. One multipoint call will
be established for each logical subnet of each protocol that has the
broadcast keyword set.
To configure multipoint signalling on an ATM interface, use the
following commands beginning in global configuration mode:
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