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%SW_MATM-4-MACFLAP_NOTIF: Host 000e.0cc4.700d in vlan 1 is flapping between port Gi1/0/2 and port Gi1/0/36


I am facing the above mention issue flapping between port Gi1/0/2 and port Gi1/0/36 since last month twice a week repeating, after checking in Cisco Switch3750X Logs this error comming ? before a month this issue was not coming suddenly it is coming might be reason for adding some wrong static route or adding new device on netwrok

Can somebody help me to diagnose this issue is this critical as this is my core switch all servers are connected to it.......

Thanks & Regards


  • LAN Switching and Routing
Everyone's tags (1)
Cisco Employee

%SW_MATM-4-MACFLAP_NOTIF: Host 000e.0cc4.700d in vlan 1 is flapp


Error Message    SW_MATM-4-MACFLAP_NOTIF: Host [enet] in [chars] [dec] is flapping

between port [chars] and port [chars]

Recommended Action    The switch found the traffic from the specified host flapping

between the specified ports. [enet] is the host MAC address, [chars] [dec] is the switch

ID, the first and second [chars] are the ports between which the host traffic is flapping.

Recommended Action    Check the network switches for misconfigurations that might cause a

data-forwarding loop.

Further more I would like to add:

I have checked the outputs and I can see that there is only I mac addressbthat is causing the problem, i.e0012.950a.9952, could you please trace this mac address and see if it is seen within the switch or it is being learnt

across the switch.

I can also see that the port channel is connected to the server, we could

get the error message if the NIC teaming is not done correctly.

NIC teaming allows users to group two or more physical NICs into a single

logical network device called a bond. Once a logical NIC is configured, the

virtual machine is notaware of the underlying physical NICs. Packets sent to

the logical NIC are dispatched toone of the physical NICs in the bond and

packets arriving at any of the physical NICs areautomatically directed to

the appropriate logical NIC.

If one of the underlying physical NICs is broken or its cable has been

unplugged, server  will detect the fault condition and automatically move

traffic to another NIC in the bond. This capability eliminates a single

point of failure for any one physical NIC and makes the overall network

connection fault-tolerant.

Hope this helps.



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