From: Ash (nester2k@gmail.com)
Date: Tue Oct 02 2007 - 02:06:36 ART
AutoQos in this situation would be perfect since your only goal is to
achieve VOIP QOS. Will keep your configs nice & simple. It also does a great
job in keeping the threshold assigments / b/w allocation level detailed
configs very simple & straight forward with reasonable numbers for
deployments prioritizing just VOIP. Stuff like the DBL configs on 4500 that
one can miss to configure, autoqos takes care of it without troubling the
Engineer.
The only downside to AutoQOS is that it just honours and prioritizes VOIP
traffic. If you are planning to implement Unified Communications /
Telepresence type solutions including interactive and streaming video in
future along with business critical applications having specific QOS needs,
you'll have a need to re evaluate the QOS configs and either rebuild new
policies altogether or tweak AUTOQOS policies to achieve the desired QOS.
Many deployments just start of with AUTOQOS and expand upon it to fullfil
their needs.
On the other hand, if you love to dig deep and get into the nitty gritties
of true buffer management on CAT platforms, Advance configuration has
tons of granularity to offer you. Along with ensuring that resources are
shared in fairness amongst the users, it gives you additonal security
features such as NAC.
So just like a ccie lab ospf question, the true answer is it depends lol.
depends on the existing and future needs as well as the level of complexity
thats acceptable to support such a deployment.
rgrds,
On 10/1/07, Antonio Soares <amsoares@netcabo.pt> wrote:
>
> Hello group,
>
> I need to configure QoS in a Campus Network composed of several 3750s,
> 4500s
> and 6500s. I'm looking for the minimal config in order to avoid potential
> voice quality issues. Right now i have this:
>
>
> ##############################
> Catalysts 3750:
> ##############################
> 4Q3T (or 1P3Q3T)
> ##############################
> Ports with PC+IP Phone:
> ##############################
> mls qos trust cos
> mls qos trust extend cos 0
> priority-queue out
> ##############################
> Uplinks:
> ##############################
> mls qos trust dscp
> priority-queue out
> ##############################
>
>
> ##############################
> Catalysts 4500:
> ##############################
> 4Q1T (or 1P3Q1T)
> ##############################
> Ports with PC+IP Phone:
> ##############################
> qos trust cos
> qos trust extend cos 0
> tx-queue 3
> priority high
> ##############################
> Uplinks:
> ##############################
> mls qos trust dscp
> tx-queue 3
> priority high
> ##############################
>
>
> ##############################
> Catalyst 6500:
> ##############################
> Ports with PC+IP Phone:
> ##############################
> WS-X6148-45AF
> 2Q2T
> WS-X6348-RJ-45
> 2Q2T
> ##############################
> mls qos trust cos
> mls qos trust extend cos 0
> ##############################
> Uplinks:
> ##############################
> WS-X6724-SFP
> 1P3Q8T
> ##############################
> mls qos trust dscp
> priority-queue cos-map 1 5
> ##############################
> Voice Servers:
> ##############################
> WS-X6748-GE-TX
> 1P3Q8T
> ##############################
> mls qos trust dscp
> priority-queue cos-map 1 5
> ##############################
>
>
> I know that Cisco provides a QoS Network Design Guide:
>
>
> http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmigrati
> on_09186a008049b062.pdf
>
>
> But i really wonder if i need to implement all those complex
> configurations
> to accomplish my goal.
>
>
> Any sugestions are welcome.
>
>
> Thanks.
>
> Regards,
>
> Antonio Soares
> CCIE #18473, CCNP, CCIP
> http://pwp.netcabo.pt/amsoares/
>
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