Seems to me to that is a layer 1 issue. your interface is restarting because
is lossing keepalives (after lossing 3 keepalives in a row the interface
will restart itself). Have you noticed that the carrier transitions are to
the roof? What Delija said may be true, check all parameters agains your
telco, make sure you have same encapsulation on both sides, if still failing
do a loop test (follow this document
http://cisco.com/en/US/tech/tk713/tk...800a754b.shtml
make sure that you perform it creating the cable and not using the loopback
command) if the test goes sucessfull on both sides there's no doubt is your
telco.
--
2nd Law of Thermodynamics: Chaos will Reign.
///////////////////
--Anthrax--
//////////////////
"RTR" <> wrote in message
news: ups.com...
> Hi guys
> Have a cisco 2811 with 2 serail point to point t1 one to ISP other one
> to remote location
>
> the remote location has a 1700 router. the connectivity is very flaky
> it keeps going up and down every few days and comes up and then goes
> down.
> 2811 does NAT to get the remote location on internet.
>
> I checked on 2811 and did a show interface serial0/1/0:0
>
> I see that every 15 seconds this what is happening
>
> serial is up line protocol is up
> 15 seconds later
> serial is down line protocol is down
> 15 seconds later
> serial is up line protocol is down
> 15 seconds later
> serial is up line protocol is up
> 15 seconds later
> serial is down line protocol is down
> This cycle keeps going on and on.
>
> checked with the provider they are saying circuit is fine.
> ------------------------------------------------
> here is a output of sh interface command
>
> Serial0/1/0:0 is down, line protocol is down (both are going up and
> down)
> Hardware is GT96K Serial
> Description: ---> T1 to ASHBURN. PROVIDER: AT&T
> Internet address is 10.95.4.1/24
> MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
> reliability 255/255, txload 1/255, rxload 1/255
> Encapsulation HDLC, loopback not set
> Keepalive set (10 sec)
> Last input 00:00:07, output 00:00:06, output hang never
> Last clearing of "show interface" counters never
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Queueing strategy: weighted fair
> Output queue: 0/1000/64/0 (size/max total/threshold/drops)
> Conversations 0/1/256 (active/max active/max total)
> Reserved Conversations 0/0 (allocated/max allocated)
> Available Bandwidth 1152 kilobits/sec
> 5 minute input rate 0 bits/sec, 0 packets/sec
> 5 minute output rate 0 bits/sec, 0 packets/sec
> 2773 packets input, 153976 bytes, 0 no buffer
> Received 614 broadcasts, 0 runts, 1 giants, 0 throttles
> 555832 input errors, 555832 CRC, 237655 frame, 132855 overrun, 0
> ignored, 417642 abort
> 2816 packets output, 223809 bytes, 0 underruns
> 0 output errors, 0 collisions, 48 interface resets
> 0 output buffer failures, 0 output buffers swapped out
> 433 carrier transitions
> Timeslot(s) Used:1-24, SCC: 0, Transmitter delay is 0 flags
> ------------------------------------------------------------------------
>
> Thanks
>
> RTR
>
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