Our topology is a 6509 with MSFC at the BDC and a 4006 in the IDF serving the workstations. CGMP is enabled on the 4006. But I notice that about every second I see multicast traffic for port 1985 at our workstations. Since CGMP is enabled at the edge 4006 - why am I seeing this multicast traffic at all ports of the edge?
Since HSRP uses port 1985; the question became does CGMP block link local multicast addresses.
Here is a cut and paste from this link:
In general, addresses from 188.8.131.52 to 184.108.40.206 are reserved and used by various protocols (standard or proprietary, like HSRP). Cisco recommends that you not use these for GDA in a multicast network. CGMP and IGMP Snooping do not work with this reserved address range
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 custome...