This sounds like your router misses LMI status messages every once and a
while. This could mean a timer problem or the serial interface
could be too busy to process them correctly. My guess is the timer problem,
check with the carrier (or use a WAN sniffer) to see how often LMI status
messages are being sent from the frame switch to your router, then make sure
the defaults or the config on your router matches.
Brian
"David Welch" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi, Could anyone help with the following : Part of our network consists of
> Cisco 4500 routers connected via BT frame relay links.
> The problem I am seeing on all 10 routers is links going down then up,
often
> for exactly one minute : eg
>
> .Oct 24 16:25:32 UTC: %FR-5-DLCICHANGE: Interface Serial2/0 - DLCI 592
state
> cha
> nged to INACTIVE
> .Oct 24 16:25:32 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial2/0.
> 4, changed state to down
> .Oct 24 16:26:32 UTC: %FR-5-DLCICHANGE: Interface Serial2/0 - DLCI 592
state
> cha
> nged to ACTIVE
> .Oct 24 16:26:32 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial2/0.
> 4, changed state to up
>
> The PTT have tested all lines and insist they are clean
> This is happening about 5 - 10 times a day. The IOS was upgraded not too
> long ago I think. It is now 12.0(4)
> This doesn't seem to have much impact but my customer just wants to know
> why!
> Any ideas/suggestions very welcome
>
> TIA
>
> Dave Welch
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