Interface Status

Unanswered Question
May 4th, 2007


What could be the reason for the following Symptom.

Interface Status:- Down.

Interface Line protocol:- UP

Has anyone experienced such type of problem? If yes please share.



I have this problem too.
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Overall Rating: 5 (1 ratings)
leighharrison Fri, 05/04/2007 - 02:24

Hi there,

I'm afraid that this is impossible!

You can have Down/Down, Up/Down and Up/Up

These are at different layers of the OSI model and the protocol could never be up if there was nothing plugged in the interface.

Hope that clarifies,


** Please rate all posts **

mohammedmahmoud Fri, 05/04/2007 - 03:16


I beleive that i've seen this once before, in STUN networks:

"keepalives in STUN flow between the TCP peers to ensure that the peer connection is up. You can tune the keepalives if your peers are going down/up because of keepalive loss"

HTH, please rate if it does help,

Mohammed Mahmoud.

The_guroo_2 Mon, 05/07/2007 - 05:01

Guys i rekon u have to see the basic thing........and for that u have to go back to CCNA level where OSI model explains everything......your serial interface is at

physical layer (1st) and your line protocol is datalink layer (Layer 2) if the physical is down your datalink will be always down........cuz its dependent on your physical link......regards....plz rate all posts


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