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From: "Arun Arumuganainar" <aarumuga@hotmail.com>
To: "CCIEing" <2beccie@163.com>, "Nawaz, Ajaz" <Ajaz.Nawaz@bskyb.com>,
"'KSGoh'" <kianseng.goh@gmail.com>, "Cisco certification"
<ccielab@groupstudy.com>
References: <1D57F0C66C34A442B3B83C397D85CED10BE3E2@OSTEXCH02.bskyb.com>
<001a01c60bbe$776e31c0$5a12d386@asia.unity>
Subject: Re: troubleshooting Serial interface!
Date: Wed, 28 Dec 2005 20:51:20 +0530
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How show interface output could also help!!! . Here are some of the tips
that could help in your trouble shooting
1) Pls. check if Keepalive is enabled on both sides . It should be same on
both sides .
2) Another thing could be Clockrate configuration !!! Try configuring clock
rate on both sides . Actually You will have configure this on DCE . If you
are not sure of which one is the DCE, configure the clockrate on both sides
IOS will accept this configuration only on the DCE.
3) Check if there are discrepancy in encapsulation.Both should be of same
encapsulation . Incase you are configuring FR . Configure one as FR-DCE . In
case you are trying back to back connect disable the keepalive .
4) Finaly it could be due to faulty cable or controller as well.
Thanks and Regards
Arun
----- Original Message -----
From: "CCIEing" <2beccie@163.com>
To: "Nawaz, Ajaz" <Ajaz.Nawaz@bskyb.com>; "'KSGoh'"
<kianseng.goh@gmail.com>; "Cisco certification" <ccielab@groupstudy.com>
Sent: Wednesday, December 28, 2005 8:23 PM
Subject: Re: troubleshooting Serial interface!
> Also, check the interface configured with "clock rate" is connected with
the
> DCE v.35 cable.
>
> ----- Original Message -----
> From: "Nawaz, Ajaz" <Ajaz.Nawaz@bskyb.com>
> To: "'KSGoh'" <kianseng.goh@gmail.com>; "Cisco certification"
> <ccielab@groupstudy.com>
> Sent: Saturday, December 24, 2005 6:58 AM
> Subject: RE: troubleshooting Serial interface!
>
>
> > Send us the show controllers serial 1 from both routers.
> >
> > Ajaz Nawaz
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > KSGoh
> > Sent: 23 December 2005 22:51
> > To: Cisco certification
> > Subject: troubleshooting Serial interface!
> >
> > have the following problem on my R1, R2 just show int up/down and
without
> > any
> > other error message..
> >
> > 00:25:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1,
changed
> > state
> > to down
> > 00:25:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1,
changed
> > state
> > to up
> > 00:25:40: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1,
changed
> > state
> > to down
> > 00:25:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1,
changed
> > state
> > to up
> > 00:26:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1,
changed
> > state
> > to down
> > 00:26:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1,
changed
> > state
> > to up
> >
> >
> > my config is very simple...
> > on R1
> > interface Serial1
> > ip address 10.100.100.1 255.255.255.0
> > clockrate 64000
> > end
> >
> > on R2
> > interface Serial1
> > ip address 10.100.100.2 255.255.255.0
> > end
> >
> > any idea how can i troubleshoot this ?
> > i tried debug int s 1
> > but nothing comes out..
> >
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