[cisco-voip] Auto-QoS ?

[Jonathan Charles]

OK, but here's the question no one is answering...

Saying "Auto-QOS sucks" is all well and good, but first off, some of
us are not CCIEs... and also, have you ever actually experienced a
voice quality issue with the Auto-QOS on Cisco switches?

To be perfectly honest, I have come across so many installations (some
quite large) with NO layer-2 QOS that I find it difficult to
understand how it Auto-QOS could be a problem.

That being said, when the 3560s first came out, Auto-QOS strangled
non-priority traffic to about 4MB/sec on a GigE switch... (since fixed
by code updates)...

All in all, I think AQ has matured to a point of being perfectly
acceptable for LAN Switching...

On the other hand, I didn't even realize Auto-QOS was available for
routers until recently (I was so comfortable with CBWFQ that I never
even looked into the automatic way), when I did finally run into it,
it just spews in the same config I would do by hand anyway...



Jonathan

On 6/5/07, Carter, Bill <bcarter at sentinel.com> wrote:
> AutoQoS on the switches still maps COS 3 to DSCP AF31(26), when current
> SRND and CM installations set call control to DSCP CS3(24).  I run
> autoqos on the switches then adjust the map.
>
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jonathan
> Charles
> Sent: Tuesday, June 05, 2007 3:10 PM
> To: Paul Choi
> Cc: cbomba at s4nets.com; cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] Auto-QoS ?
>
> I would agree on the Router-side.. but for the switches, it is far more
> likely to have positive results than the manual method...
> especially without years of experience configuring your queues...
>
> To be honest, the auto-qos dumps config into the switch that is, A:
> Cisco TAC supported, B: Likely to work great and C: easy.
>
> Why wouldn't you use it? Unless you have a lot of SNA traffic or
> something...
>
>
> Jonathan
>
>
> On 6/5/07, Paul Choi <asobihoudai at yahoo.com> wrote:
> > Auto-QoS, better known as "QoS for idiots" (like
> > myself) is a cookie cutter approach to your network. I think it's
> > better not to use if you have the knowhow to implement QoS yourself.
> >
> > --- "Christopher M. Bomba" <cbomba at s4nets.com> wrote:
> >
> > > I have implemented QoS on multiple voice networks from 6500s to
> > > 2950s.  I have done it always manually.  The network I am working on
>
> > > now is insisting on Auto-QoS.  I haven't done it before but only
> > > heard horror stories from it.
> > >
> > > What are you thoughts on this?  This is a very large network that is
>
> > > going to have multiple clusters and thousands of devices connected
> > > to the IPT network.
> > >
> > > Thanks,
> > >
> > > Chris
> > >
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> >
> >
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