Switch cisco 3560. I see that I learn the same mac for 2 different ports

[miguelgonzalez99726]

Hello, I wanted to ask a question if someone had the following problem. I am seeing in the logs of my Cisco 3560 switch that in 2 different ports I see the same Mac address, and I am noticing packet loss and microcuts.

The log I see on the switch are the following:

Jun 2 10:06:12.278 AR: %SW_MATM-4-MACFLAP_NOTIF: Host e811.328a.4f58 in vlan 110 is flapping between port Gi0/21 and port Po1
Jun 2 10:08:13.285 AR: %SW_MATM-4-MACFLAP_NOTIF: Host e811.328a.4f58 in vlan 110 is flapping between port Po1 and port Gi0/21
Jun 2 10:10:13.318 AR: %SW_MATM-4-MACFLAP_NOTIF: Host e811.328a.4f58 in vlan 110 is flapping between port Gi0/21 and port Po1
Jun 2 10:12:13.327 AR: %SW_MATM-4-MACFLAP_NOTIF: Host e811.328a.4f58 in vlan 110 is flapping between port Gi0/21 and port Po1
Jun 2 10:14:13.378 AR: %SW_MATM-4-MACFLAP_NOTIF: Host e811.328a.4f58 in vlan 110 is flapping between port Gi0/21 and port Po1

The topology of my network is:

PC1

 |

======= Switch1 =====

 Portch2

 ||

 ||

 L2L

 ||

 ||

 PortCh1 (Gi0/25 y Gi0/26)

======= Switch2 =====

 Gi0/21

 |

 PC2

where I am seeing the logs is on Switch2 Cisco 3560

It could be something in the Port channel configuration
1?
Does anyone have an idea why this inconvenience is due?

Best regards

[Reza Sharifi]

Hi,

Make sure STP is running correctly on both switches and one switch is the root. Also, make sure the Portchannel is configured correctly. Also, check to ensure that no one has connected a hub with 2 ports to the same switch.

HTH

[Martin L]

There are NO wireless extension to those switches or PCs?  if you have "mobile" wireless device and 2 hotpots; then MAC will show up here and there when you move around. 

Regards, ML
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