From: Chris Lewis \(chrlewis\) (chrlewis@cisco.com)
Date: Sat Jun 25 2005 - 12:47:12 GMT-3
I believe George's explanation is correct. To answer your question about
how you convert from priority queueing to MQC, I don't think you do. One
can convert custom queueing to MQC, but not priority queueing.
Priority queueing got a bad rap as it lead to queue starvation, meaning
that in some cases the lower priority queues never got serviced, as if
there was any traffic in the higher priority queues, those were the ones
sent. To have MQC replicate priority queuing, you would have to somehow
create 4 classes, tell the router to always service class one first if
there were any packets in it, only if empty, go to queue 2, only if
queue one and two are empty, go to queue 3 etc. I don't think there is a
way to do this.
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sila Moni
Sent: Saturday, June 25, 2005 7:16 AM
To: George Cassels; ccielab@groupstudy.com
Subject: RE: QoS - legacy priority convert to MQC
Thanks George. How would one convert legacy priority queuing to MQC
then? Thanks.
--- George Cassels <glcassels3@nc.rr.com> wrote:
> Actually Sila I think there is a big difference, but don't have a lot
> of time this AM...heading to spend my Saturday in a fun NMC lab the
> rest of the day..
>
> But if I remember right when you have multiple priority queues set up
> in MQC it becomes a like fifo round robin setup where as in priority
> queuing if there is data in the high queue it will always get serviced
> first.
>
> George
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of Sila Moni
> Sent: Friday, June 24, 2005 11:19 PM
> To: ccielab@groupstudy.com
> Subject: QoS - legacy priority convert to MQC
>
> Hi
>
> I'm practicing QoS. I've some questions.
>
> Are the two methods the same? If not specified, I can assign any
> value to my priority right? BTW, if my total value exceed 75%, I
> should use 'max-reserved-bandwidth xx' under the interface.
> What
> if the value is less than 75%?
>
> TIA
> Sila
>
> interface Ethernet1
> ip address 1.1.1.1 255.255.255.0
> priority-group 1
> !
> priority-list 1 protocol ip medium tcp smtp priority-list 1 protocol
> ip normal tcp telnet priority-list 1 protocol ip low priority-list 1
> protocol ip high tcp www
>
> --------------------------------------------
> interface Ethernet1
> ip address 1.1.1.1 255.255.255.0
> service-policy output PRIORITY
> !
> ip cef
> !
> class-map HIGH
> match protocol http
> !
> class-map MEDIUM
> match protocol smtp
> !
> class-map NORMAL
> match protocol telnet
> !
> policy-map PRIORITY
> class HIGH
> priority percent 40
> class MEDIUM
> priority percent 20
> class NORMAL
> priority percent 10
> class class-default
> police cir percent 5
>
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