You can do 'show frame lmi' on your router and compare 'Num Status Enq. Sent'
with 'Num Status Enq. Rcvd'. They should be the same. If they don't match,
clear your counters and check again, and check after your problem occurs.
Another useful command to check lmi is 'debug frame lmi'. This is a fairly safe
debug, unless you have squillions of PVCs. Having said that, don't blame me if
turning it on makes your network fall over :-) You can check how often you
receive lmi from the switch (make sure it matches your keepalive, which is 10
seconds by default), and every minute (this might vary depending on switch type,
dunno) you should see a list of PVCs known by the switch and their status (0x0
is inactive, 0x2 is active if I recall correctly).
Having said that, I suspect it's not an LMI problem. If the LMI wasn't received
at all, I *think* you would see the PVC showing up as deleted (the switch
doesn't know about it), not inactive (the switch knows about it and knows it's
down).
Do PVCs on all ten routers go down at the same time? If so, I'd seriously yell
at your telco.
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 08/11/2000 10:17 am
---------------------------
"Brian Molinari" <[EMAIL PROTECTED]> on 08/11/2000 08:07:59 am
Please respond to "Brian Molinari" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: (bcc: JENNY MCLEOD/NSO/CSDA)
Subject: Re: Frame relay problem
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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