[c-nsp] Problem VLAN Flapping between trunk port

[Md. Jahangir Hossain]

Dear friend;

wishes all are fine

I have a 3750G switch which have some vlan as like 14,103,104  but problem is we found some vlan flapping problem between two trunk ports .

Bellow some config;

 interface GigabitEthernet1/0/6
 description FON-FTP-VLAN-104
 switchport access vlan 104
 switchport mode access

interface GigabitEthernet1/0/27
 description Port salira_Ban-12.1
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 14,101,104,199
 switchport mode trunk
 speed nonegotiate
 spanning-tree portfast trunk
 spanning-tree bpdufilter enable
!
interface GigabitEthernet1/0/28
 description Port salira_Ban-13.1
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 14,104,150,151
 switchport mode trunk
 load-interval 30
 speed nonegotiate
 spanning-tree portfast trunk
 spanning-tree bpdufilter enable
!



LOG:

*Mar  1 12:43:54: %SW_MATM-4-MACFLAP_NOTIF: Host 0018.d17b.96d7 in vlan 104 is flapping between port Gi1/0/28 and port Gi1/0/27
*Mar  1 12:43:59: %SW_MATM-4-MACFLAP_NOTIF: Host 1078.d211.b194 in vlan 104 is flapping between port Gi1/0/28 and port Gi1/0/27
*Mar  1 12:44:06: %SW_MATM-4-MACFLAP_NOTIF: Host 0018.d17b.96d7 in vlan 104 is flapping between port Gi1/0/28 and port Gi1/0/27
*Mar  1 12:44:09: %SW_MATM-4-MACFLAP_NOTIF: Host 1078.d211.b194 in vlan 104 is flapping between port Gi1/0/28 and port Gi1/0/27
*Mar  1 12:44:20: %SW_MATM-4-MACFLAP_NOTIF: Host 0018.d17b.96d7 in vlan 104 is flapping between port Gi1/0/28 and port Gi1/0/27



please suggest me , how can i resolved it ?


thanks
jahangir