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Input error on 3725


Got some input error on an interface of a gateway. What could be the cause ?

FastEthernet0/0 is up, line protocol is up

Hardware is Gt96k FE, address is 0011.200d.b470 (bia 0011.200d.b470)

Description: Inside Network UL

Internet address is X.X.X.X/29

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

reliability 255/255, txload 1/255, rxload 10/255

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 4d18h

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 13678

Queueing strategy: Class-based queueing

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

Conversations 0/2/256 (active/max active/max total)

Reserved Conversations 2/2 (allocated/max allocated)

Available Bandwidth 5000 kilobits/sec

5 minute input rate 4089000 bits/sec, 459 packets/sec

5 minute output rate 361000 bits/sec, 241 packets/sec

98512390 packets input, 3678068503 bytes

Received 6910 broadcasts, 0 runts, 0 giants, 0 throttles

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

0 watchdog

0 input packets with dribble condition detected

99352772 packets output, 1153391011 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out


Re: Input error on 3725

there is only 7 input errors. Does the count keep incrementing? If not, you don't need to worry about it.

Most input error is caused by cabling, NIC or port issue. Does "show interface f0/0 counter error" tell you anything?

Re: Input error on 3725

The input errors are increasing at a rate of 1 or 2 a day. SRST is configure on it and I started losing the gateway for a few second in CUCM.

The command show interface f0/0 counter error does not give any output on a router.

Re: Input error on 3725

Did you check input error to see if it incremented everytime when CUCM lost its gateway?

You might need to pay attention to "output drop", which has a big count.

Capture "show interface" every time after CUCM lose its gateway and compare those "input error" and "output drop" count to see which one is incrementing.

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