Re: Serial0/0 is up, line protocol is down

From: joe_astorino@comcast.net
Date: Sat Mar 07 2009 - 22:47:59 ARST

Excellent! Yeah I could not believe it either when that happened to me because I had literally just taken it out of the plastic and it was an official cisco cable
Sent from my Verizon Wireless BlackBerry

-----Original Message-----
From: Xiaobo Zhu <xiaobo@zhu.net>

Date: Sun, 8 Mar 2009 08:27:14
To: <joe_astorino@comcast.net>
Cc: Scott Morris<smorris@internetworkexpert.com>; CCIE Lab<ccielab@groupstudy.com>
Subject: Re: Serial0/0 is up, line protocol is down

Many thanks to all!

Problem solved after I replace the cable.

On Sun, Mar 8, 2009 at 6:58 AM, <joe_astorino@comcast.net> wrote:

> Hey guys, I had an issue similar to this once and replacing the DTE/DCE
> serial cable solved the issue. It's rare, but sometimes we do have physical
> problems!
>
> - Joe
>
> ----- Original Message -----
> From: "Scott Morris" <smorris@internetworkexpert.com>
> To: "Xiaobo Zhu" <xiaobo@zhu.net>, "CCIE Lab" <ccielab@groupstudy.com>
> Sent: Saturday, March 7, 2009 8:13:12 AM GMT -05:00 US/Canada Eastern
> Subject: RE: Serial0/0 is up, line protocol is down
>
> The timing seems off to me (20 seconds between up/down). I would expect 30
> seconds if the keepalives were not working.
>
> Check "show interface s0/0 | in Keep"
>
> And you may also want to do a "debug serial interface" on both sides. Make
> sure timestamps are on for your debugs as well, but watch the keepalives go
> back and forth.
>
> It's possible to be a physical thing as well. Perhaps a pin is bent or
> something?
>
>
> Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
> JNCI-M/JNCI-ER
> Senior CCIE Instructor
>
> smorris@internetworkexpert.com
>
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
> Toll Free: 877-224-8987
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>
> Knowledge is power.
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> Study hard and be Eeeeviiiil......
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Xiaobo Zhu
> Sent: Saturday, March 07, 2009 6:41 AM
> To: CCIE Lab
> Subject: Re: Serial0/0 is up, line protocol is down
>
> Here is the notification
>
> R1(config-if)#
> *Mar 1 00:03:14.983: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial0/0, changed state to up
> R1(config-if)#
> *Mar 1 00:03:34.984: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial0/0, changed state to down
> R1(config-if)#
> *Mar 1 00:03:44.984: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial0/0, changed state to up
> R1(config-if)#
> *Mar 1 00:04:04.985: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial0/0, changed state to down
> R1(config-if)#
> *Mar 1 00:04:14.985: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial0/0, changed state to up
> R1(config-if)#
> *Mar 1 00:04:34.986: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial0/0, changed state to down
> R1(config-if)#
>
>
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-- 
Xiaobo Zhu

Blogs and organic groups at http://www.ccie.net

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