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Multicast messages received

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)

1 REPLY
Cisco Employee

Re: Multicast messages received

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,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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