Why Port downup on Catalyst 2950

[s.zink]

Why change a port under normal conditions the status?

Aug 25 08:58:11: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/43, changed state to down

Aug 25 08:58:12: %LINK-3-UPDOWN: Interface FastEthernet0/43, changed state to up

Aug 25 08:58:16: %LINK-3-UPDOWN: Interface FastEthernet0/43, changed state to up

Aug 25 08:58:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/43, changed state to up

This happens several times a day on different switches.

Does anybody know why? We have some connection problems with time critical applications and think this is a possible reason.

WS-C2950G-48-EI

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interface FastEthernet0/43

spanning-tree portfast

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[aashish.c]

Hi,

I think this port is connecetd to server or pc, try putting following command

switch(config-if)#switchport access mode

switch(config-if)#switch access vlan x

What are the NIC cards of PCs. If there are 3COM or Intel NICs then update their latest drivers. And download the drivers frm 3COM and Intel only not from their manufacturers website like compaq or dell or HP.

Thanks

Aashish C

[s.zink]

Hello,

thanks for the answer.

Yes, there are PCs connected.

The config on the switchports is not the solution. It is actually configured on some switches.

Next I will try the driver solution.

Has someone else seen this kind of portflaping?

Thanks

Sebastian

[amassiah]

Try to set speed 100 and duplex full on FE 0/43 or speed 10 and duplex Half. Mismatch duplex configuration cause this behavior.