From: joe_astorino@comcast.net
Date: Sat Mar 07 2009 - 20:58:04 ARST
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
Toll Free: 877-224-8987
Outside US: 775-826-4344
Knowledge is power.
Power corrupts.
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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