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New Member

what is 'output errors' in 'sh int 'command ?

FastEthernet0 is up, line protocol is up

Hardware is PQUICC_FEC, address is xxxxx

Internet address is xxxxxxx

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

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

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, 100BaseTX/FX

ARP type: ARPA, ARP Timeout 04:00:00

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

Last clearing of "show interface" counters never

Input queue: 3/75/788/0 (size/max/drops/flushes); Total output drops: 0

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

high: 0/20/0, medium: 0/40/0, normal: 0/60/0, low: 0/80/0

5 minute input rate 119000 bits/sec, 38 packets/sec

5 minute output rate 223000 bits/sec, 52 packets/sec

18088660 packets input, 3005334673 bytes

Received 597 broadcasts, 0 runts, 0 giants, 0 throttles

121 input errors, 0 CRC, 0 frame, 121 overrun, 0 ignored

0 watchdog

0 input packets with dribble condition detected

19793114 packets output, 601091835 bytes, 1190 underruns

1194 output errors, 0 collisions, 4 interface resets

0 babbles, 0 late collision, 0 deferred

4 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

In above o/p for 'sh int f0', I found '1194 output errors'.So can anyone help me ? I would like to know what could be cause for these errors on f0 port? bad ethernet cable,bad port,excess traffic on that port Or any other possible reasons?

Hall of Fame Super Silver

Re: what is 'output errors' in 'sh int 'command ?


I believe that the 1194 output errors that you observe is related to the 1190 underruns reported on the interface. An underrun is when the interface starts to transmit a frame and transmits faster than the data is transferred from the I/O buffer to the interface output.




Re: what is 'output errors' in 'sh int 'command ?

A good link that describes all the fields is located at:

New Member

Re: what is 'output errors' in 'sh int 'command ?

Thanks Nadim that was very helpfull link.