Hi,
I wonder if you can help me, I am getting this error on both my edge switches - 10 16:09:04: %SW_MATM-4-MACFLAP_NOTIF: Host 000e.d771.089e in vlan 12 is flapping between port Gi1/0/23 and port Gi1/0/25 - see below.
Both switches are connected together and each switch also has a connection to Pix firewalls which are connected in a failover configuration.
At the moment the error does not appear to be service affecting but I want to make sure this does not become an issue and would really like to know why it happened. At the moment the error has not reappeared in the log since Friday but the only thing that happened on Friday which has since been rectified was a UPS failure, please advice and let me know if there is anything I nedd to check for.
Switch1#sh log
10 16:09:04: %SW_MATM-4-MACFLAP_NOTIF: Host 000e.d771.089e in vlan 12 is flapping between port Gi1/0/23 and port Gi1/0/25
Switch1#sh mac-address-table
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
12 000e.d771.089e DYNAMIC Gi1/0/25
Switch1#sh run int g1/0/25
!
interface GigabitEthernet1/0/25
description Link to Switch2
switchport trunk encapsulation dot1q
switchport trunk native vlan 12
switchport mode trunk
end
Switch1#sh run int g1/0/25
!
interface GigabitEthernet1/0/23
description Link to Pix1 Firewall
switchport access vlan 12
speed 100
duplex full
end
Switch2>sh log
Apr 10 16:09:04: %SW_MATM-4-MACFLAP_NOTIF: Host 000e.d771.089e in vlan 12 is flapping between port
Gi1/0/25 and port Gi1/0/24
Switch2>sh mac-
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
12 000e.d771.089e DYNAMIC Gi1/0/24
Switch2#sh run int g1/0/24
!
interface GigabitEthernet1/0/24
description Link to Pix2
switchport access vlan 12
end
Switch2#sh run int g1/0/25
interface GigabitEthernet1/0/25
description Link to Switch1
switchport trunk encapsulation dot1q
switchport trunk native vlan 12
switchport mode trunk
spanning-tree cost 2000000
end
Many thanks,
Martha.
