Can you tell what is the clocking on both the router.. To me this appears to
be a clocking issue...
> -----Original Message-----
> From: Perusek, Rick [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, February 01, 2001 10:47 AM
> To: 'Albert Lu'; GroupStudy
> Subject: RE: Serial Line Protocol Problems
>
> Hi Albert,
>
> Are you using the same encapsulation type on both interfaces? (Probably
> HDLC
> for a back to back hookup.) What about keepalives? Are they set to the
> same
> value at both ends? It sounds like one router is sending keepalives and
> the
> other one is not.
>
> Rick
>
> -----Original Message-----
> From: Albert Lu [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 01, 2001 7:58 AM
> To: GroupStudy
> Subject: Serial Line Protocol Problems
>
>
> Hi All,
>
> I've got a problem with the serial port of a 2500 of mine.
>
> I used a serial back to back cable, in order to connect 2 2500s. I know
> what
> a normal response the 2500 should give, it should normally detect that the
> interface is up (I've used no shutdown already), and then set the line
> protocol to up.
>
> For one of the serial port, the interface and the line protocol changes to
> up when I connect the two routers together. But after awhile, this is what
> I
> get:
>
> 01:30:48: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed
> state
> to up
> 01:31:08: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed
> state
> to down
> 01:31:18: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed
> state
> to up
> 01:31:38: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed
> state
> to down
> 01:31:48: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed
> state
> to up
> 01:32:08: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed
> state
> to down
> 01:32:18: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed
> state
> to up
> 01:32:38: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed
> state
> to down
>
> It keeps continuing. From what I can see, the line protocol keeps going up
> and down periodically, however the interface is still up.
>
> This is what I've tried:
> - Different cables.
> - Different serial ports
> - Changing clock rate and bandwidth
> - Rebooting the router
>
> Could someone give me some suggestions?
>
>
> Thanks
>
> Albert
>
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