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input errors match crc's

William Maguire
Level 1
Level 1

All,

I have an odd problem. I have a point to point ds3. With a 3845 router with a ds3 card in it on one end and a 3662 with a HSSI card and external dsu on the other. When I cut to live traffic the 3845 begins taking input errors and crcs. the two numbers increment at the same rate. 35000 input errors 35000 crc's. Does anyone know what would cause this? I have eliminated the circuit itself and the layer 1 inhouse. Any help or ideas would be great.

Thanks,

Bill

Serial4/0 is up, line protocol is up

Hardware is DSXPNM Serial

Internet address is 10.130.230.2/30

MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, crc 16, loopback not set

Keepalive set (10 sec)

Restart-Delay is 0 secs

Last input 00:00:03, output 00:00:06, output hang never

Last clearing of "show interface" counters 01:35:42

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 9

Queueing strategy: fifo

Output queue: 0/40 (size/max)

30 second input rate 0 bits/sec, 0 packets/sec

30 second output rate 0 bits/sec, 0 packets/sec

6351 packets input, 1864380 bytes, 0 no buffer

Received 558 broadcasts, 0 runts, 0 giants, 0 throttles

5006 input errors, 5006 CRC, 2583 frame, 890 overrun, 0 ignored, 1776 abort

5690 packets output, 1343611 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

4 carrier transitions

DSU mode 0, bandwidth 44210, real bandwidth 44210, scramble 0

2 Replies 2

Hello Bill,

can you try and change the crc size (which is 16 by default) to 32 ?

interface Serial4/0

crc 32

Regards,

GP

bhatia.sachin
Level 1
Level 1

Hi Bill,

The problem ur facing seemz to be at layer 2 or maybe with the service provider (4 carrier transitions).Check that same encap (HDLC) is set on both routers and other parameters as well.Do a clear conter an try ping from either side.if errors still come up call the service provider to test the link at local an remote end