[c-nsp] Output queues - access vs. trunk

[Blake Dunlap]

You're likely running into the low size of buffers on that switch. If you
aren't using many ports at once you can raise the maximum size of the port
queue a good bit since it just carves more out of the main shared pool on
that switch. A search of the archives should find the relevant commands.
You're looking for the command to set them above 100% buffer size
allocation.

-Blake
On Jul 19, 2013 11:50 PM, "Mikael Abrahamsson" <swmike at swm.pp.se> wrote:

> On Fri, 19 Jul 2013, Jerry Bacon wrote:
>
>  When the the ports facing the radios are in access mode, everything is
>> good, but when they are in trunk mode (which we need), we get 2 - 3% packet
>> loss at small packet sizes (high packet rates). We've tracked it down to
>> output queue drops, but I don't understand why it's different for access
>> vs. trunk.
>>
>
> Please describe more in detail what your configuration is like.
>
> If the fluke is connected to an access port, you then vlan tag the traffic
> on the trunk port, then you're adding 4 bytes per packet meaning your
> access port is no longer wire speed and the loss you're seeing would be
> understandable.
>
>  Any ideas? And would QOS tuning be likely to help?
>>
>
> QOS is a way of selecting what packets to drop. I don't see how it would
> help here.
>
> --
> Mikael Abrahamsson    email: swmike at swm.pp.se
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