All things related to multicast

["Ying Zhang" <>]

Hi list,

 

We have PIM-SM enabled on our network. Recently we've seen tons of log messages on our switch:

 

CPU5 [09/24/09 14:21:47] IPMC ERROR ipmSysAddSession FAIL: Ar AddIpmcRec S x.x.96.47 G 239.255.255.250
CPU5 [09/24/09 14:21:47] IPMC WARNING ipmSysArAddIpmcRec rarAddIpmc FAIL G 239.255.255.250 !
CPU5 [09/24/09 14:21:47] IPMC WARNING k_chg_mfc FAIL New Session x.x.96.47 239.255.255.250 is failed

 

 This has caused our switch to act slow and even drop some SNMP packets. I did some search and found out it's SSDP for Windows Universal Plug and Play.  On the mcast routing table, I can see many other users using the same protocol, but only a few were logged with the error messages. I suspect the user OS was affected by some virus. Just wondering if anyone else has seen this and how to fix it on our end.

 

Thanks.

 

Ying

Network Engineer
UNB