From: Tim Last (packtmon@yahoo.com)
Date: Wed Apr 21 2004 - 09:16:47 GMT-3
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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