Hello com,
I have a Cisco 2960X-24Ts-L switch and i have set up three vlans, 136/137/138.
Ip vlan 136: 10.10.36.0 /24
Ip vlan 137: 10.10.37.0 /24
Ip vlan 138: 10.10.38.0 /24
So far so good.
Now im getting the message:
%SW_MATM-CLUSTER_MEMBER_4-4-MACFLAP_NOTIF: Host 0800.069d.3841 in vlan 138 between port Gi1/0/19 and port Gi1/0/21
%SW_MATM-CLUSTER_MEMBER_4-4-MACFLAP_NOTIF: Host 0800.069d.3841 in vlan 138 between port Gi1/0/21 and port Gi1/0/17
%SW_MATM-CLUSTER_MEMBER_4-4-MACFLAP_NOTIF: Host 0800.069d.3841 in vlan 138 between port Gi1/0/17 and port Gi1/0/18
%SW_MATM-CLUSTER_MEMBER_4-4-MACFLAP_NOTIF: Host 0800.069d.3841 in vlan 138 between port Gi1/0/18 and port Gi1/0/16
%SW_MATM-CLUSTER_MEMBER_4-4-MACFLAP_NOTIF: Host 0800.069d.3841 in vlan 138 between port Gi1/0/16 and port Gi1/0/15
MAC 0800069 is a device from Siemens.
I checked all cables going from each port which is mentioned and the port is dedicated to each device.
Each device is connect with two networkcards.
One card goes to vlan 137.
One card goes to vlan 138.
Still there is one host which is having the same mac. This host is flapping between port 15/16/17/18/19/21
So i checked with an ip-scan each subnet by its own.
There is defenetly no matching mac address!
each device connected to the ports mentioned above has a unique mac!
First vendor bits are 00:60:65 and 00:13:95.
My question:
Can you tell me the reason why my switch is telling me that there is another Mac flapping between this ports?
