Hie
- you should have DTE cable on one router and the other DCE
- check your clock-rate on the DCE interface
- you could also check the encapsulation on either intefaces, they should match
bosire
Albert Lu wrote:
> 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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Richard Bosire
Network Engineer CCNA,CCSE
AfricaOnline (k) Ltd
tel +254-2-243775 fax +254-2-243762
http://www.africaonline.co.ke
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