Output errors at E1 Serial Interface

[admin_2]

Hi,

I use a VWIC-1MFT-E1 interface and see output errors when I do a "sh int". At the remote side the same amount aborts occur. The Telco guys checked the line and see also that the router sends illegal sequences.

So what could be the reason for an output error?

[l.metzger]

Hello,

output errors would most likely indicate a hardware fault. the packet is already malformed when leaving the router therefore I would advice to return the WIC to Cisco.

Regards, Laurent

[#3]

Hello,

I replaced the VWIC already but the errors remain.

The interface shows also underruns. I found: "Number of times that the transmitter has been running faster than the router can handle." But no hint how to resolve this behavior ...

regards

Juegen

[deilert]

an output error occurs when the interface rx more traffic than it can handle. Can you paste in a sh int s0

also what is on the head end ? what kind of circuit is this ? point to point ? FR ATM ?

[#5]

fhtesgo1-gw#sh int ser 0/1:0

Serial0/1:0 is up, line protocol is up

Hardware is QUICC Serial

Description: Serial E1 2MS zur FHT-Esslingen, 2. Link

Internet address is 129.143.116.38/30

MTU 1500 bytes, BW 1920 Kbit, DLY 20000 usec,

reliability 255/255, txload 2/255, rxload 27/255

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 3d01h

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

Queueing strategy: priority-list 1

Output queue (queue priority: size/max/drops):

high: 0/50/0, medium: 0/100/0, normal: 0/150/0, low: 0/150/0

5 minute input rate 204000 bits/sec, 31 packets/sec

5 minute output rate 19000 bits/sec, 22 packets/sec

6835574 packets input, 3349689267 bytes, 0 no buffer

Received 26279 broadcasts, 0 runts, 0 giants, 0 throttles

297 input errors, 0 CRC, 0 frame, 54 overrun, 243 ignored, 0 abort

5158889 packets output, 1373531965 bytes, 243 underruns

243 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

and the remote side:

fhtes1-gw#sh int ser 6/3:1

Serial6/3:1 is up, line protocol is up

Hardware is Multichannel E1

Description: _es_8323_2_ E1 2MS zur FHT-Es-Goeppingen, 2. Link

Internet address is 129.143.116.37/30

MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec,

reliability 255/255, txload 21/255, rxload 3/255

Encapsulation HDLC, crc 16, Data non-inverted

Keepalive set (10 sec)

Last input 00:00:01, output 00:00:00, output hang never

Last clearing of "show interface" counters 3d01h

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5651

Queueing strategy: priority-list 1

Output queue (queue priority: size/max/drops):

high: 0/50/0, medium: 0/100/0, normal: 0/150/0, low: 0/150/5651

5 minute input rate 26000 bits/sec, 26 packets/sec

5 minute output rate 168000 bits/sec, 30 packets/sec

5162319 packets input, 1373767420 bytes, 0 no buffer

Received 26265 broadcasts, 3 runts, 0 giants, 0 throttles

246 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 243 abort

6842990 packets output, 3353315414 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

no alarm present

It's a 2M E1 leased line, point to point.

The E1 controllers indicate no errors:

Total Data (last 24 hours)

0 Line Code Violations, 0 Path Code Violations,

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs