I'd try debug interface, or lmi if you are using frame and see what the
sequence numbers look like. Also what does the show controllers look like
for this interface?
>>>Brian
>From: "Perusek, Rick" <[EMAIL PROTECTED]>
>Reply-To: "Perusek, Rick" <[EMAIL PROTECTED]>
>To: "'Albert Lu'" <[EMAIL PROTECTED]>, GroupStudy
><[EMAIL PROTECTED]>
>Subject: RE: Serial Line Protocol Problems
>Date: Thu, 1 Feb 2001 10:47:26 -0500
>
>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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