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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