[c-nsp] Output drops on 2960

Saku Ytti saku at ytti.fi
Fri Feb 5 09:17:12 EST 2016

Hey John,

> Switch is a straight layer 2, no layer 3 functionality short of mls qos and some dscp mutation. Anybody seen this kind of thing before? Any commands that may help point me towards why these drops are happening? Anybody ever fatten the q's on these things?

Turning on 'mls qos' without through understanding of the platform
(which is hard to acquire, as docs are sparse), almost invariably
makes things progressively worse.
It'll split the already tiny buffers into smaller buffers, and you
likely have significant amount of buffer memory now carved which you
cannot use.

Read https://supportforums.cisco.com/document/31581/egress-qos#_Toc191205672
and redesign your QoS config, and try avoid having many queues, if you
can live with one great, two is doable but anything else, can you
really  absolutely justify it?


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