2911 router interface errors with overruns on gig interface

[amprantino]

Cisco router is 2911 with IOS 15.5-3.M7

A gigabit interface with about 15 Mbit traffic is taking input errors and matching overruns. It accumulates about 150.000 per week. No CRC or frame errors on the interface.

Cable is changed; speed/duplex are auto.

On the other side of the router there is the switch not managed by us.

Searching the forum , I found various approaches to tshoot the issue.

I tried to change the buffers, and various other but no solution yet.

How can I tackle this problem?

Any help is appreciated!

[Georg Pauwen]

Hello,

at that low traffic volume, are your users actually experience noticeable problems ? There are a few cosmetic bugs that could explain both counters increasing at the same time.

Not sure what you have tried, but you could apply a simple QoS policy:

policy-map DEFAULT

class class-default

fair-queue

!

interface GigabitEthernet0/0

service-policy output DEFAULT

[paul driver]

Hello

Overruns is basically stating the interface cannot handle or buffer the data its receiving.

Have you tried increasing the input queue to see if the drops decrease?

int x/x
hold-queue xxx in

[amprantino]

paul driver: Yes, I had. Unfortunately it didn't solve the issue. Moreover, I have the feeling that using a value above 300 increased the error-rate.

Georg Pauwen
As you said bandwidth is too low; users are not facing any noticeable delays.

I found a few bugs with IOS incorrectly updating counters etc. but it wasn't referring to my IOS version.

I will try the simple QoS policy you posted and revert back to the topic

Thank you for your replies.