Hostflapping on Cisco 4507

[silks101]

I have a 4507 switch which has been having a lot of errors on several ports - I have pasted some of the output below

36w5d: %C4K_EBM-4-HOSTFLAPPING: Host 00:96:5C:BC:00:96 in vlan 3 is flapping between port Fa3/41 and port Fa3/40
36w5d: %C4K_EBM-4-HOSTFLAPPING: Host 00:96:5C:BC:00:96 in vlan 3 is flapping between port Fa3/40 and port Fa3/39
36w5d: %C4K_EBM-4-HOSTFLAPPING: Host 00:96:5C:BC:00:96 in vlan 3 is flapping between port Fa3/40 and port Po1
36w5d: %C4K_EBM-4-HOSTFLAPPING: Host 00:96:5C:BC:00:96 in vlan 3 is flapping between port Po1 and port Fa3/41
36w5d: %C4K_EBM-4-HOSTFLAPPING: Host 00:96:5C:BC:00:96 in vlan 3 is flapping between port Fa3/44 and port Fa3/41

I have checked the physical connections of the ports and these interfaces go into a canary converter.
I believe that these errors caused a temporary connectivity problem on our network.

I have looked at Cisco's web site for a definition of the error (which leads to Spanning tree problems) but it doesn't tell me how to resolve them

Does anyone have any ideas??


Many thanks

Steve Lindley
CCNA

 

[baddos]

Are all those ports plugged into one device?

 

[silks101]

All the ports go into a canary converter (the fibre then feeds switches on different floors of the building)

Steve Lindley
CCNA

 

[baddos]

I would think you need to create an etherchannel port group on your switch to support that team. I don't know the model number of the media converter your using, so can't really help with all the specifics.