Switch MAC Flap- %SW_MATM-4-MACFLAP_NOTIF: Host 843d.c693.f400

[AzharMuhammad05932]

Last night, on our Nagios monitoring, we saw a lot of switches in this location were down. Upon checking on the switch’s log, I found there is flapping on the EIGRP and  MAC-Address. 

Please find the attached document of logs for your reference.

[Flavio Miranda]

What you can see is the EIGRP flapping but we cant see why. It could be flapping because something else was happening.

Configured from console by mycp2j0e on vty0 (172.29.175.198)

This user was connected on the device during the flaps. What you guys were doing on the network. Was it some maitenance window?

[MHM Cisco World]

"Known symptoms that can occur when the switch CPU is too busy:

• Spanning-tree topology change—When a Layer 2 network device does not receive timely spanning-tree BPDUs on its root port, it considers the Layer 2 path to the root switch as down, and the device tries to find a new path. Spanning tree reconverges in the Layer 2 network.
• Routing topology change, such as BGP route flapping or OSPF & EIGRP route flapping."

So both are found the mac-falling and routing flapping then there is High CPU utilize lead to this issue.

check the CPU utilize