[c-nsp] How to find the root cause of packet loss

[Anton Turygin]

On Fri, 18 Jun 2010, Peter Rathlev wrote:

> On Fri, 2010-06-18 at 14:56 +0300, Anton Turygin wrote:
>> Getting output drops and packet loss on Catalyst WS-C2960G-48TC-L.
>
> Someone should start selling T-shirts with a pun on that. :-)
>
>> The traffic is relatevely small but output drops are growing hundreds per
>> second.
>>
>> GigabitEthernet0/45 is up, line protocol is up (connected)
> [...]
>>    Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 32013814
>>    Queueing strategy: fifo
>>    Output queue: 0/4096 (size/max)
>>    5 minute input rate 57250000 bits/sec, 33933 packets/sec
>>    5 minute output rate 480872000 bits/sec, 47800 packets/sec
> [...]
>
> The problem is probably "micro-bursts", which the 2960 is exceptionally
> bad at handling.
>
> You can adjust some of the SRR queueing parameters. Look in the list
> archive for details on the 3560, which has similar problems that have
> been discussed extensively.

Unfortunately didn't work for me.

> Or get another switch. :-)

Which model/vendor would you advice?


Regards,
Anton Turygin