[c-nsp] mitigate output drops on Cisco 2960G platform

[Blake Dunlap]

Basically, you're using the wrong switch if you say the word "server". That
being said, you can search the archives for the proper configuration to
oversubscribe the shared buffers.

-Blake


On Fri, Sep 20, 2013 at 1:11 PM, Gert Doering <gert at greenie.muc.de> wrote:

> Hi,
>
> On Fri, Sep 20, 2013 at 07:56:26PM +0300, Martin T wrote:
> > I have three WS-C2960G-24TC-L switches which all have about ten
> [..]
> > Any suggestions other than reduce the traffic on switch uplink ports?
>
> "Get some real switches"...
>
> Not exactly constructive, sorry.  Been there, felt the pain, ranted on
> cisco-nsp on 2960 and their lack of buffers, and worse, their lack of
> documentation on their lack of buffers.  There's *lots* of it in the
> archives...
>
> If you don't need QoS, turning it *off* with "no mls qos" will help
> somewhat (as then all buffers are available for your packets, not only
> 1/4 which is allocated to that particular queue).  What we had to
> resort to is to make the uplink ports 2xGE or even 4xGE channels to
> exceeding avoid a load of ~25-30 percent per link - we had fairly
> bursty ingress traffic, which (for microseconds a time) overfilled
> the buffers, while the average traffic across all ingress ports was
> WAY below the rate the egress could handle.   Microbursts, too little
> buffering, switches not suited for that traffic.
>
> gert
> --
> USENET is *not* the non-clickable part of WWW!
>                                                            //
> www.muc.de/~gert/
> Gert Doering - Munich, Germany
> gert at greenie.muc.de
> fax: +49-89-35655025
> gert at net.informatik.tu-muenchen.de
>
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