When the circuit is up, try and rapid ping end to end - is the ping continuously okay ?
if it keeps stopping at regular intervals perhaps you have clock slip.

If the clocksource is good, I don't understand why you see this issue.

Did you open a jtac case ?

cheers
Sean


On 4/17/09 10:02 AM, Faizal Rachman wrote:
Both interface using same config  as follow :
ce1-2/0/0 {
     description "*** RouterA ***";
     clocking external;
     e1-options {
         framing unframed;
     }
     no-partition interface-type e1;
}
e1-2/0/0 {
     description RouterA;
     mtu 4500;
     clocking external;
     encapsulation cisco-hdlc;
     unit 0 {
         family inet {
             address xxx.xxx.xxx.xxx/30;
         }
         family iso;
         family mpls;
     }
}

And the other :
e1-1/0/1 {
     description RouterB;
     mtu 4500;
     clocking external;
     encapsulation cisco-hdlc;
     e1-options {
         framing unframed;
     }
     unit 0 {
         family inet {
             address xxx.xxx.xxx.xxx/30;
         }
         family iso;
         family mpls;
     }
}

Transmission using DDF

Rgrds,
Faizal


On Fri, Apr 17, 2009 at 2:53 PM, Sean Clarke<s...@clarke-3.demon.nl>  wrote:

  And on the other end  ?
What is providing the clock ?
What is the box on the other side ?
If they are directly connected, i.e. no SDH or so in the middle ... try
clocking BOTH ends as internal.

cheers




On 4/17/09 9:19 AM, Faizal Rachman wrote:

i use external clocking.

show configuration interfaces e1-2/0/0
mtu 4500;
clocking external;
encapsulation cisco-hdlc;
unit 0 {
     family inet {
         address xx.xx.xx.xx/30;
     }
     family iso;
     family mpls;
}

On Fri, Apr 17, 2009 at 1:35 PM, Sean Clarke<s...@clarke-3.demon.nl>wrote:

  On 4/17/09 8:15 AM, Faizal Rachman wrote:

But if we ignore the restarted router, why should i have to unplug/plug E1
cable facing to peer router to make it work again.
I believe that keepalive  is kind of setting to make interface know while it
is up or down. But after several times, link cannot revert back to normal
until unplug/plug ritual.


  That should not happen IMO ... there must be something else up .. timing
?
However are you clocking the circuit ?



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