SW PORT and INTERFACE VLAN FLAPPING

[Bethuelle]

Hi All,

Oct 23 15:16:37.857: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan60, changed state to down

Oct 23 15:16:38.452: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan60, changed state to up

Oct 23 15:16:38.838: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to down

Oct 23 15:16:43.611: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to up

Oct 23 15:16:50.800: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan60, changed state to down

Oct 23 15:16:51.782: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to down

Oct 23 15:16:58.988: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan60, changed state to up

Oct 23 15:16:59.936: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to up

Oct 23 15:17:29.581: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to down

Oct 23 15:17:34.262: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to up

Oct 23 15:17:43.507: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan60, changed state to down

Oct 23 15:17:44.488: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to down

Oct 23 15:17:48.389: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan60, changed state to up

Oct 23 15:17:49.329: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to up

What can be the cuase of these logs?

Thxs

[Ivan Shirshin]

Hi!

Can you send the following outputs from this and neighbor device (choose corresponding interface and vlan), please?

     show version

     show int fa0/24

     show int vlan 60

     show vlan id 60

     show run int vlan 60

     show run int ga0/24

     show log

Kind Regards,
Ivan Shirshin

**Please grade this post if you find it useful.

[Leo Laohoo]

1.  Possible faulty cablilng;

2.  Faulty NIC;

3.  Unstable OS