Since this multicast traffic is only for local subnet, Sun Servers probably sends the multicast packet by converting the multicast IP to multicast MAC directly instead of sending "igmp join". Switch builds its MAC table based on source mac in the packet. Your multicast MAC will be a destination MAC. Therefore, switch never learns it.
A 2950 by default has IGMP snooping enabled for all VLANs, however it needs to see a mutlicast router(s) to actually start filtering traffic. Use the following command and its subcommands to see whats going on:
I don't have routers just one swtich 2950 and two Sun server (Check Point Firewall in load balancing multicast). Because I'm in lab for the moment. I see nothing appear in the mac-address table multicast.
IGMP snooping works by sniffing the IGMP joins/reports or receivers.
If there is no router with multicast routing enabled that sends every 60 seconds an IGMP general query IGMP snooping cannot listen to IGMP reports.
However, this is an optimization of multicast forwarding the two devices should be able to exchange multicast frames with only drawback that frames are flooded to all other ports that are in the same Vlan.
So is communication working between the two devices ?
If not you may need to disable igmp snooping on the vlan where the two servers are connected to revert to a flooding behaviour.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...