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Beginner

MAC Flapping

Hi,

 

I've situation in our network, We installed VMWare ESXi and installed Mikrotik CHR in it and it is connected to CISCO 3750 Ethernet switch from there it is connected to CISCO 3750 12 Port Fiber switch from there network is distributed using different switches. I'm getting a frequent issue that 

 

Mar 31 18:23:42.481 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 000c.29f9.fa2c in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/12
Mar 31 18:23:42.514 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 4c5e.0c46.b87e in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/12
Mar 31 21:27:13.401 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 000c.29f9.fa36 in vlan 1 is flapping between port Gi2/0/11 and port Gi2/0/12
Apr 1 07:50:53.726 IST: %SW_MATM-4-MACFLAP_NOTIF: Host e067.b37a.10e8 in vlan 1 is flapping between port Gi2/0/12 and port Gi2/0/2
Apr 1 08:06:42.366 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 4c5e.0c46.b87e in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/12
Apr 1 08:06:42.366 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 000c.29f9.fa2c in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/12
Apr 1 08:06:42.803 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 000c.29f9.fa36 in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/12
Apr 1 08:06:43.541 IST: %SW_MATM-4-MACFLAP_NOTIF: Host c4ad.345d.5922 in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/12
Apr 1 08:06:44.615 IST: %SW_MATM-4-MACFLAP_NOTIF: Host cc6e.a433.f7ae in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/11
Apr 1 08:08:18.693 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 4c5e.0c46.b87e in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/12
Apr 1 08:08:18.727 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 000c.29f9.fa2c in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/12
Apr 1 08:08:19.197 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 000c.29f9.fa36 in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/12
Apr 1 08:08:19.331 IST: %SW_MATM-4-MACFLAP_NOTIF: Host c4ad.345d.5922 in vlan 1 is flapping between port Gi2/0/2 and port Gi2/0/12

 

 

I couldn't find any loop in the network. When we restart Mikrotik CHR, there will be nor such error for the next 24 hours. Can you please help me to resolve the issue. All the mac addresses displayed in the log are, VMWare, Mikrotik, and some other switches none of them belongs to user end devices.

2 REPLIES 2
Highlighted
Beginner

Re: MAC Flapping

Hello Pavithran,

 

A couple of questions, first:

 

Which switch are you taking these logs from?

What are roles and configurations of the affected ports?

 

The more information provided the better in these situations. 

Highlighted
Explorer

Re: MAC Flapping

do you have port-channels installed on the 3750?  remember not all mac-flaps are necessarily an issue or failure

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