Gigabit Ethernet High Input Errors and Overruns

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Aug 19th, 2008
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Good morning,


Our company is using Gigabit Ethernet interface to connect to our ISP, which rate limit 155 Mbps.


Although we're able to connect to them, but we have high input errors and input overrun, but zero output errors and overrun.


Attached documents consist of:


show version

show interface gigabitEthernet 0/3

show controllers gigabitEthernet 0/3


Any advices for above case?


-zamri-


meow#show interface gigabitEthernet 0/3

GigabitEthernet0/3 is up, line protocol is up

Hardware is BCM1250 Internal MAC, address is X (bia X)

Description: * PNC *

Internet address is A.B.C.D/30

MTU 1500 bytes, BW 1550000 Kbit, DLY 10 usec,

reliability 255/255, txload 21/255, rxload 15/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s, media type is RJ45

output flow-control is XON, input flow-control is XON

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 4d04h

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

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 93616000 bits/sec, 16967 packets/sec

5 minute output rate 127934000 bits/sec, 20304 packets/sec

3722461450 packets input, 346372024 bytes, 0 no buffer

Received 18 broadcasts, 0 runts, 0 giants, 0 throttles

4294967287 input errors, 0 CRC, 0 frame, 694331 overrun, 0 ignored

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

679357412 packets output, 2554237425 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 pause output

0 output buffer failures, 0 output buffers swapped out



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Giuseppe Larosa Tue, 08/19/2008 - 09:36
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Hello Zamri,

first of all verify the following:


if IP CEF is enabled on gi0/3 or post a filtered version of sh run gi0/3


Are you using gi0/1 and gi0/2 because they are all managed by the NPE-G1 ?


Are you using all the 9 serial interfaces ?


here are the meaning of the errors:


input error Includes runts, giants, no buffer, CRC, frame, overrun, and

ignored counts. Other input-related errors can also cause the

input error count to be increased, and some datagrams may

have more than one error; therefore, this sum may not balance

with the sum of enumerated input error counts.


overrun Shows the number of times that the receiver hardware was

incapable of handing received data to a hardware buffer

because the input rate exceeded the receiver's capability to

handle the data.


Hope to help

Giuseppe

d.poppleton Wed, 08/20/2008 - 10:56
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I had a similar issue with the NPE-G1 interface, although my input error to overrun ratio was 1-1, whereas you have a lot more input errors. There is a bug where if you have an input service-policy then the processing that takes causes the overruns. Take off the input service-policy and the overruns drop dramatically.

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