There can be a lot of reasons for the "Line protocol down"
1. The cable connected from the router may be Bad.
2. The CU is not sending the clock. Check whether all the pins such as
DCD, DSR, DTR,RTS,CTS are UP.
3. There should be same config for Keepalive at both the ends. Either no
keepalive or keepalive set
4. The encapsulation type should be same at both the ends.
5. The cable is not connected at the remote end.
Waiting for your feedback
Hitesh
CCNA
"Atif Awan" <[EMAIL PROTECTED]> on 07/04/2000 10:40:53 AM
Please respond to "Atif Awan" <[EMAIL PROTECTED]>
To: "ANIL.YADAV" <[EMAIL PROTECTED]>, "Mike Narine" <[EMAIL PROTECTED]>
cc: [EMAIL PROTECTED] (bcc: harora)
Subject: RE: Serial0 is up, line protocol is down!
The router sees the packets with its own keepalive sequence numbers so
thats
why it knows that there is a loopback in place.
Atif
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
ANIL.YADAV
Sent: Tuesday, July 04, 2000 9:44 AM
To: Mike Narine
Cc: [EMAIL PROTECTED]
Subject: RE: Serial0 is up, line protocol is down!
I'm doing this loopback test on the back side of interface, its aphysical
loop.
earlier I thought it could be because of different protocols being used at
the other end of the serial link.
thanks.
On Tue, 4 Jul 2000, Mike Narine wrote:
> How are you connecting? Are the routers back-to-back or are you
connecting
> to a Frame/T1/etc?
> Make sure your encaps are the same (do a show int s0 to verify). Also,
are
> both ends showing the same stats for the Serial interface.
> Line Protocol might not be coming up when there's a loop because the
command
> "down-when-looped" might be on... check your running cofig.
> Good luck.
>
> -Mike
>
> -----Original Message-----
> From: ANIL.YADAV [mailto:[EMAIL PROTECTED]]
> Sent: Monday, July 03, 2000 11:23 PM
> To: Omer Shommo
> Cc: Cisco Group Study
> Subject: Re: Serial0 is up, line protocol is down!
>
>
>
> Hi!!
> everybody
>
> I'm facing a starnge problem. Even if I put a physical loop oan the
serial
> interface my protocol doesn't come up it shows me something like this
>
> Serial1 is up, line protocol is down (looped)
>
> tried varios options but doesn' help.
>
>
> thanks
> anil
>
>
> On Fri, 23 Jun 2000, Omer Shommo wrote:
>
> > Hello to All,
> >
> > If Serial0 is up, line protocol is down, then what should I check? Give
me
> as many answers as you can.
> >
> > BTW what is the line protocol? is it a network protocol like ip, ipx?
or
> is it the data link layer protocol?
> >
> > Omer
> >
> >
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