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Feb 23 09:59:00.714 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in

Hi

Can any one suggest me how resolve the problem of Mac-address flapping ,as per the scenerio is concern My Switch (SW1 and SW2 ) are conncted to Customers switches (Cusw1 sand Cusw2) ,now My Sw1 having inbuilt Mac-address is reflecting in other 2 ports of Cutomer Switches .

Reflecting the error :- Feb 23 09:59:00.714 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan 9 is flapping between port Gi7/12 and port Gi7/48"

5 REPLIES

Re: Feb 23 09:59:00.714 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11

This sounds like it could either be a spanning tree issue or ports are flapping cause spanning tree to re-converge (possible downstream from your kit).

If you have no link up down errors on your kit I would ask your customer to check there's for any errors.

This MAC address is a cisco (MAC 001192 belongs to cisco), so I suspect this is the bridge ID of one of those switches.

Community Member

Re: Feb 23 09:59:00.714 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11

Dear Adam ,

Thanks for the response ,yes this Mac addres belong to Switch 3550 flash

Please find the error message getting in thr switches

VEL Core SW#sh logging

Syslog logging: enabled (0 messages dropped, 76 messages rate-limited, 0 flushes

, 0 overruns)

Console logging: level warnings, 218344 messages logged

Monitor logging: level notifications, 197 messages logged

Buffer logging: level debugging, 1303384 messages logged

Exception Logging: size (8192 bytes)

Count and timestamp logging messages: disabled

Trap logging: level debugging, 1303379 message lines logged

Logging to 10.77.28.15, 788712 message lines logged

Log Buffer (4096 bytes):

between port Gi7/12 and port Gi7/48

Feb 23 09:59:00.714 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 09:59:15.350 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 09:59:30.083 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 09:59:44.731 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:00:01.763 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/48 and port Gi7/12

Feb 23 10:00:16.600 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:00:31.224 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:00:45.904 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:01:00.533 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:01:15.189 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:01:32.605 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/48 and port Gi7/12

Feb 23 10:01:44.401 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/48 and port Gi7/12

Feb 23 10:01:59.054 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:02:16.702 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:02:31.450 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:02:46.055 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:03:00.611 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:03:15.315 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:03:30.043 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:03:44.656 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

Feb 23 10:03:59.368 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:92:83:B6:00 in vlan

9 is flapping between port Gi7/12 and port Gi7/48

This is the only mesage reflecting on thr ports.

Please recrt back for any other info

thnk

anubhuti

Re: Feb 23 09:59:00.714 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11

Hi Anabhuti

Gi7/12 and port Gi7/48 are trunks right? could you paste there config please.

Community Member

Re: Feb 23 09:59:00.714 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11

Hi Adam,

AS the configuration is at the csutomer end, and as per the security norms we cant provide u the whole config,but the those ports are trunk ports?

Regards,

Anubhuti

Community Member

Re: Feb 23 09:59:00.714 IST: %C4K_EBM-4-HOSTFLAPPING: Host 00:11

This is what I have seen in the past, the same MAC address is appearing on two devices.

Usually a customer has a programmable chip which has duplicate MAC address to re-write them on a network interface.

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