In trying to troubleshoot a multicast problem, I have discovered that I don't fully understand part of the multicast process and so would be grateful if I could get an answer to the following. When a client streams traffic out to a multicast group, I had assumed that it would treat the traffic as any other unicast traffic in that it would see the destination IP as outside its subnet (i.e. a CLass D address) and so send it onto its gateway (with the source and destination MAC at the layer 2 being set to the server and router MACs respectively) - no IGMP joining happens because it is a source only. Is this true, or does the server set the destination MAC to the multicast MAC that corresponds to the multicast IP (which an ethereal capture seems to be suggesting)? If this is true, then what is the process that gets the stream to the router, i.e. how does the switch determine that it should add the corresponding multicast MAC to the port facing the router?
Could any answers please be copied to my direct email as well as the list, as I only get digests. Thanks, Michael. -- Michael Robson, | Tel: 0161 275 6113 Networks, | Fax: 0161 275 6040 University of Manchester. | Email: [EMAIL PROTECTED] Youth and skill are no match for experience and treachery. _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/