topic Re: Qusestion about Erro:Kern.IPv4Mc.Error(Unable to ~~) in EXOS in ExtremeSwitching (EXOS/Switch Engine)

Qusestion about Erro:Kern.IPv4Mc.Error(Unable to ~~) in EXOS

Bolu — Tue, 20 Aug 2024 04:14:54 GMT

08/07/2024 14:49:42.11 <Erro:Kern.IPv4Mc.Error> Unable to set IPMC index for s,G,v=9602893e,effffffa,237 IPMC 2, unit 0 Operation failed
08/07/2024 14:49:42.11 <Erro:Kern.IPv4Mc.Error> Unable to Add L2 1:28 to s,G,v=9602893e,effffffa,237 IPMC 1, unit 0 Entry not found
08/07/2024 14:49:42.11 <Erro:Kern.IPv4Mc.Error> Unable to Add L2 1:9 to s,G,v=9602893e,effffffa,237 IPMC 1, unit 0 Entry not found
08/07/2024 14:49:42.11 <Erro:Kern.IPv4Mc.Error> IPmc sender entry s,G,v=9602893e,effffffa,237 IPMC 1 was not added to all switching resources

Whenever I type "show log" on the switch, the above sentence is repeated.

I'm guessing it's a matter of multicast, but I did not Understand this words.

Plz help anyone solve the problem.

What is the meaning of the error, and what is the solution?

Re: Qusestion about Erro:Kern.IPv4Mc.Error(Unable to ~~) in EXOS

Chris_H — Fri, 23 Aug 2024 12:47:44 GMT

This means that the multicast-table entry for group 239.255.255.250 (effffffa from hex to DEC) from source 150.2.137.62 (9602893e from hex to DEC) on VLAN 237 could not be programmed for some reason. This 239.255.255.250 group is being used by clients for UPnP and when the switch is set to learn source-group-vlan (default) it can be that it fills up the tables unnecessarily if there are many clients.

Depending on the environment it may make sense to set the forwarding-mode to "group-vlan" so that only one entry is being used in the multicast-table for the group/vlan (disregarding the source), but that should be looked into for this specific situation.

There's some explanation here: https://extreme-networks.my.site.com/ExtrArticleDetail?an=000091058

Re: Qusestion about Erro:Kern.IPv4Mc.Error(Unable to ~~) in EXOS

Bolu — Mon, 26 Aug 2024 04:06:02 GMT

Thanks to your reply! Your answer was very helpful to me.