Right. No L3. The only thing is that because you do not have a complete L3, IGMP is not really completely there, so you should try and look at disabling IGMP snooping (link in my last email).
Arie -----Original Message----- From: Joann Deng [mailto:[EMAIL PROTECTED] Sent: Saturday, September 01, 2007 21:18 PM To: Arie Vayner (avayner); [email protected] Subject: RE: [c-nsp] FWSM blocking multicast traffic between two hosts in sameVlan? Yes, that's correct, both servers are on the same VLAN. So theoretically, no layer 3 should be involved. Joann --- "Arie Vayner (avayner)" <[EMAIL PROTECTED]> wrote: > 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/ > ________________________________________________________________________ ____________ Got a little couch potato? Check out fun summer activities for kids. http://search.yahoo.com/search?fr=oni_on_mail&p=summer+activities+for+ki ds&cs=bz _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
