Multicast messages received

Unanswered Question
May 10th, 2008

I am receiving below following messages in 6509 switch logging, please note that i am not using any mulitcast application in our network.


Is these messages are critical or not?




5d02h: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0

100.5e2b.6945,50)->0x930 Protocol :0 Error:3

5d02h: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0

100.5e7a.6f5e,1)->0x806 Protocol :0 Error:3

5d02h: %MCAST-SP-6-GC_LIMIT_EXCEEDED: IGMP snooping was trying to allocate more

Layer 2 entries than what allowed (15488)

5d02h: %SYS-5-CONFIG_I: Configured from console by asad onvty1 (128.1.1.143)

5d02h: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0

100.5e46.acb5,50)->0x930 Protocol :0 Error:3

5d02h: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0

100.5e3e.4013,50)->0x930 Protocol :0 Error:3

5d02h: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0

100.5e1e.253b,50)->0x930 Protocol :0 Error:3

5d02h: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0

100.5e1e.2d81,50)->0x930 Protocol :0 Error:3

5d02h: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0

100.5e5f.688e,1)->0x806 Protocol :0 Error:3

5d02h: %MCAST-SP-6-GC_LIMIT_EXCEEDED: IGMP snooping was trying to allocate more

Layer 2 entries than what allowed (15488)

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Harold Ritter Sat, 05/10/2008 - 17:41

Asad,


This could possibly be caused by an IGMP attack. Since you are not running any mcast application on this box, the simplest solution would be to disable IGMP snoopig globally.


If you were running a mcast application, the recommendation would be to configure an IGMP ACL on the interfaces where igmp is required.


Please refer to the following document for more information on how to configure an IGMP ACL:


http://www.cisco.com/en/US/docs/ios/12_3t/12_3t7/feature/guide/gtmcxacl.html


Regards,

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