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New Member

Interfaces up/down

Could someone please explain if this behaviour is normal.

When a client connects it seems to go Down then Up then Down then Up again?

Any ideas?

When an interface goes up and down

Dec 5 08:48:26: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/14, changed state to down

Dec 5 08:48:27: %LINK-3-UPDOWN: Interface GigabitEthernet1/14, changed state to down

Dec 5 08:48:32: %LINK-3-UPDOWN: Interface GigabitEthernet1/14, changed state to up

Dec 5 08:48:33: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/14, changed state to up

Dec 5 08:48:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/14, changed state to down

Dec 5 08:48:37: %LINK-3-UPDOWN: Interface GigabitEthernet1/14, changed state to down

Dec 5 08:48:40: %LINK-3-UPDOWN: Interface GigabitEthernet1/14, changed state to up

Dec 5 08:48:41: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/14,

5 REPLIES
New Member

Re: Interfaces up/down

Hi Michael,

This is not normal , check your cable*

HTH

DAk

Bronze

Re: Interfaces up/down

The issue seems to beat at the physical level or the data link level.

1. Ensure that the proper cables are being used.

2. Confirm the configuration settings on both sides of the link are correct. Verify the proper duplex and speed is configured. Check that the correct media-type is configured when applicable.

New Member

Re: Interfaces up/down

Could it be a feature of STP that the port comes up then goes down again?

I am not seeing any additional problems caused by this, it just seems strange?

New Member

Re: Interfaces up/down

Hi,

Is this happening to all the clients ? or with only one client ?

Have you already checked the cable and duplex settings on both the sides?

Regards

Inayath

New Member

Re: Interfaces up/down

most clients it seems. its not causing a problem its jsut something i have noticed in syslog

cabling and duplexing is okay. running 1gb. so auto detects to 1gb full as default

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