[nsp] QoS on the 3550

[Andrey Kostin]

Hi,
Modular QoS in 3550 used only for traffic policing and not for queueing.
Interfaces have 4 queues on egress, one of them can be priority queue,
others are Weighted Round Robin. Packets can be mapped to egress queue based
only on CoS, so you need to assign some CoS value to interested frames and
them map this value to priority queue.
These links describe queing and policing mechanics on 3550:
http://www.cisco.com/warp/public/473/153.html
http://www.cisco.com/warp/public/473/187.html
-----------------------------------
Andrey Kostin, Demos-Internet ISP
http://www.demos-internet.ru/


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of sgsubs at vdata.co.uk
> Sent: Tuesday, May 13, 2003 13:36
> To: Nsp (E-mail)
> Subject: [nsp] QoS on the 3550
>
>
> Hi,
> I'm testing QoS on the 3550-24 running IOS 12.1(12c) the
> documentation for QoS on the 3550 talks about the configuration of WRR on
> the Egress interface for the scheduling.
>
> Modular QoS is also supported and I can configure this in the
> normal manner, when I configure this the scheduling is Fair Queuing.
> In modular QoS you can normally state a priority queue by using
> the priority command on the policy map for the class you want to
> place in the high priority queue. On the 3550 this option is not there.
>
> On the egress interface you can issue the command priority-queue
> out to invoke a high priority queue.
>
> My question is how does this priority queue relate to the modular
> qos, I have looked at the mls qos map and cannot see a mapping for
> IP precedence to the priority queue?
>
> Would I best to proceed with the Modular QoS style of
> configuration for consistency of the QoS config on the network?
>
> Thanks in advance
>
> Regards,
>
> Steven Godfrey
> Network Development Manager
> Phone 01423 850007
> steven.godfrey at intechnology.co.uk
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