Issue: 2 older machines running an application (MNR Imaging) that uses multicast to communicate.
They generate the error messages on our core switchesâ¦..
2008 Oct 20 13:33:48 %MCAST-2-IGMP_ADDRAL:IGMP: Address Aliasing for 01-00-5e-00-00-01
2008 Oct 20 13:33:48 %MCAST-2-IGMP_FALLBACK:IGMP: Running in FALL BACK mode
2008 Oct 20 13:33:48 %MCAST-2-IGMP_ADDRALDETAILS:IGMP: Multicast address aliasing: From 00-1e-0b-ec-12-b8 (188.8.131.52) on 4/3 to 01-00-5e-00-00-01 (239.0.
The problem here appears to be the destination MAC address.
The application writers have no idea how to change the application destination MAC address.
We connected the two machines to a dumb switch that is in turn connected to a C2960 that is connected to a C6500.
The intent was to use the C2960 filter the problem traffic; however, a simple igmp filter on the 239.0 range did not block the traffic causing the error messages
What am I missing and is there a better way to isolate this multicast traffic off the core switches?
No answer love for me!!
my best guess is.....
10 deny igmp any any
20 deny pim any any
30 permit ip any any