Serial Interface Input Errors

Unanswered Question
Apr 21st, 2007

Hello All,

I am having some problems with a remote satellite station. Our Hub never lost the Rx. But the remote site lost Rx for about 1h. I attach the router log.

what conclusion can be drawn from the input errors? This is the only data I have to troubleshoot.

Any comment is much appreciated ... this link is giving me a big headache.

Kind regards.

I have this problem too.
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ferazar123 Sat, 04/21/2007 - 09:07

Serial0/3/0 is up, line protocol is up

Hardware is GT96K Serial

Interface is unnumbered. Using address of FastEthernet0/0 (10.100.142.251)

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

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

Encapsulation HDLC, loopback not set

Keepalive not set

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

Last clearing of "show interface" counters 02:23:36

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

Queueing strategy: Class-based queueing

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/26/256 (active/max active/max total)

Reserved Conversations 1/1 (allocated/max allocated)

Available Bandwidth 1095 kilobits/sec

5 minute input rate 9000 bits/sec, 22 packets/sec

5 minute output rate 7000 bits/sec, 12 packets/sec

90309 packets input, 6419120 bytes, 0 no buffer

Received 81 broadcasts, 0 runts, 0 giants, 0 throttles

189560 input errors, 189557 CRC, 65495 frame, 25245 overrun, 0 ignored, 106845 abort

47267 packets output, 3809966 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

pciaccio Sat, 04/21/2007 - 13:53

From your initial description, is this a true remote satallite station and is this link a satellite link to your remote site? If so from the show interface command that you have shown us you are receiving CRC and FRame errors on your recive. This is indication of a carrier problem either with the link or the Carrier T system that you are using. I would suggest that you ask the carrier or investigate the media between your endpoint routers. You proabalby have an intermittent problem...Good Luck..

ferazar123 Mon, 04/23/2007 - 03:41

Yes, this is a satellite link in C band and the output attached is from the remote router.

The link is sometimes down for 1 hour and comes up alone, strange behaviour.

But the router "show log" doesnt show any interface reset nor carrier transitions.

What I dont understand is the amount of different input errors, why crc + frame + aborts + ignores, why this combination precisely? does this combination tell something more specific that i am missing?

Paolo Bevilacqua Mon, 04/23/2007 - 03:49

Hi Ferazar,

basically when you get all the errors it just means garbage is on the line. The router will try to make a sense of it but it can't, so the result is all kind of errors mixed.

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