Joann, Just to be sure I get you right, both servers are on the same VLAN behind the FWSM, and the FWSM is not really part of the multicast stream (it does not have to pass through it). Is that right?
If this is the case, then the FWSM should not affect the multicast stream as both servers are on the same VLAN, and multicast is handled by the L2 mechanism on the 6500. When you try to "ping <mcast grp>" - I am not fully sure how would this be sent by the host... I would recommend putting a sniffer on both hosts and making sure the traffic is sent and received correctly. Take a look at IGMP snooping: http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/swcg/s nooigmp.htm It could be that you would have to disable it on these ports (depends on how the applications behave). Arie Vayner -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Joann Deng Sent: Saturday, September 01, 2007 00:22 AM To: [email protected] Subject: [c-nsp] FWSM blocking multicast traffic between two hosts in sameVlan? Hi, We have hosts in the same Vlan, which connects to FWSM (routed mode). These two hosts run WebLogic, which uses multicast address 237.155.155.2 to communicate. But somehow, when run "ping 237.155.155.2" on one host, cannot see response back from the other. So, is it possible that FWSM is doing something fancy, like blocking multicast traffic, and we need to add some configs? Any input is highly appreciated. Thanks, Joann ________________________________________________________________________ ____________ Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos & more. http://mobile.yahoo.com/go?refer=1GNXIC _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
