Serial Errors

Connections between branches keep dropping on our leased line, originally we thought it might be a bandwidth issue so we went from a

256kbps line to a 1mbps line, but we're still getting the problem

please see posting of sh int from one of the routers

Serial0 is up, line protocol is up Hardware is QUICC Serial Description: *** NXUK9230 TO elland **** Internet address is 10.44.10.5/30 MTU 1500 bytes, BW 512000 Kbit, DLY 20000 usec, rely 255/255, load

1/255 Encapsulation HDLC, loopback not set, keepalive set (10 sec) Last input 00:00:04, output 00:00:00, output hang never Last clearing of "show interface" counters 1w0d Queueing strategy: fifo Output queue 0/40, 108 drops; input queue 1/75, 0 drops 5 minute input rate 3000 bits/sec, 5 packets/sec 5 minute output rate 5000 bits/sec, 5 packets/sec 1414314 packets input, 191327522 bytes, 0 no buffer Received 79463 broadcasts, 0 runts, 0 giants, 0 throttles 716 input errors, 155 CRC, 242 frame, 0 overrun, 0 ignored, 315 abort 1353154 packets output, 338880432 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 output buffer failures, 0 output buffers swapped out 12 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up

Any ideas??

That many errors in a week isnt near the worst that I have seen error wise...but I would say it is a carrier issue...to start call that circuit into your provider for testing...since I see you are using a Serial int and HDLC encap you must be hooked to an external CSU/DSU? Sometimes reseting them may help...this is the first things I would do to start...

I've posted both current counters here guys , one site appears to have an external unit for which seems to be set on 16 (16 x 64 = 1024?) the second site doesn't and just seems to plug straight into a box on the wall.

Any ideas guys?? both ends seem to be getting errors, also i had the comms company out three weeks ago to test the line and they said it was all fine

Serial0 is up, line protocol is up Hardware is QUICC Serial Description: *** NXUK9230 TO elland **** Internet address is 10.44.10.5/30 MTU 1500 bytes, BW 1024000 Kbit, DLY 20000 usec, rely 255/255, load

1/255 Encapsulation HDLC, loopback not set, keepalive set (10 sec) Last input 00:00:02, output 00:00:02, output hang never Last clearing of "show interface" counters 1w3d Queueing strategy: fifo Output queue 0/40, 132 drops; input queue 0/75, 0 drops 5 minute input rate 1000 bits/sec, 1 packets/sec 5 minute output rate 0 bits/sec, 1 packets/sec 1986625 packets input, 273183243 bytes, 0 no buffer Received 103835 broadcasts, 0 runts, 0 giants, 0 throttles 716 input errors, 155 CRC, 242 frame, 0 overrun, 0 ignored, 315 abort 1899452 packets output, 469844876 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 output buffer failures, 0 output buffers swapped out 12 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up

Serial0 is up, line protocol is up Hardware is QUICC Serial Description: *** NXUK9230 TO milton **** Internet address is 10.44.10.6/30 MTU 1500 bytes, BW 1024000 Kbit, DLY 20000 usec, rely 255/255, load

1/255 Encapsulation HDLC, loopback not set, keepalive set (10 sec) Last input 00:00:00, output 00:00:00, output hang never Last clearing of "show interface" counters 1w3d Queueing strategy: fifo Output queue 0/40, 30 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 1 packets/sec 5 minute output rate 2000 bits/sec, 1 packets/sec 1899522 packets input, 469860242 bytes, 0 no buffer Received 103835 broadcasts, 0 runts, 0 giants, 0 throttles 3279 input errors, 412 CRC, 2468 frame, 0 overrun, 0 ignored, 399 abort 1986723 packets output, 273203502 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 output buffer failures, 0 output buffers swapped out 0 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up

I have seen this once before....

I had the T1 tested at least 10 times, the Telco tested it and said the line was good each time....

I had to drop the CSU/DSU to 56K channels SF framing on both ends and the errors went away....

I even sent the CSU/DSU's back to Kentrox and had them tested. All came back ok.....

I raised cain with the Telco for paying for a full 64K channels and couldn't use but 56K of it, guess what, no go, but running at 56K kept the data flowing with no more errors.....