From: John Neiberger (neiby@xxxxxxxxxx)
Date: Tue Mar 26 2002 - 17:55:57 GMT-3
This could be a bad serial port or a bad
cable. Try a different cable, and if that
doesn't work then try this using the other
available ports.
Also, what IOS images are you using? I had
a problem once (but I don't recall if it was
frame relay or hdlc back to back) where the
IOS images weren't compatible. One image
was pretty old, like 11.1 or so. It may be
necessary to try newer images if that is the
case.
HTH,
John
---- On Tue, 26 Mar 2002, Barry Rowland
(reachbarry@bigfoot.com) wrote:
> I have a problem with a hdlc connection
flapping in a back to
> back configuration between two routers in
my home lab.
>
> I have a S1 on R1 to S1 on R2, R2 is the
DCE interface and the clock
> rate is
> set to 64k. I am using the default hdlc
encapsulation here so this is a
> very
> simple set up. Even if
> I use different back to back cables the
result is the same.
> (these cables work fine on my router that
I use for frame
> relay switch). Results of the sh
controller command do not
> reveal anything unusual.
>
> Changing the encapsulation to ppp has no
effect except that
> it does not flap, line protocol still
down. I guess ppp is a little
> smarter
> than hdlc.
>
> Anyone have a similar experience?
>
> Here are the configs:
>
> R1: interface Serial1
> ip address 200.20.20.1 255.255.255.0
> no ip directed-broadcast
> clockrate 64000
>
> R2: interface Serial1
> ip address 200.20.20.2 255.255.255.0
> no ip directed-broadcast
>
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