I have a Cisco 3750G switch connected to (among other things) 2 Cisco Aironet 1200 wirless AP's.
One AP is connected to port Gi1/0/31.
The switch is connected to our main building via a laser link (FSO) connected via port Gi1/0/1.
When monitoring the switch I am getting these error messages appear at varying time intervals:
%SW_MATM-4-MACFLAP_NOTIF: Host 0012.f0xx.xxxx in vlan 1 is flapping between port Gi1/0/1 and port Gi1/0/31
or
%SW_MATM-4-MACFLAP_NOTIF: Host 0015.00xx.xxxx in vlan 1 is flapping between port Gi1/0/31 and port Gi1/0/1
I have many other 3750G's and Aironet 1200's on this site, but this is the only on I get this problem with.
This is the running config for Gi1/0/31:
interface GigabitEthernet1/0/31
description WIFI 2ND FLR
end
This is the running config for Gi1/0/1:
interface GigabitEthernet1/0/1
description FSO-LINK
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1-20
switchport mode trunk
switchport nonegotiate
speed 100
duplex full
ip dhcp snooping trust
end
This is the running config for the port connected to Gi1/0/1 on our core switch:
interface GigabitEthernet1/0/8
description FSO-LINK
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1-20
switchport mode trunk
switchport nonegotiate
speed 100
duplex full
no mdix auto
ip dhcp snooping trust
The FSO link is transparent to the network. The error is consistently coming from the same 2 MAC addresses.
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