Re: OT : IOS XR QOS using priority/LLQ without policing

I faced same issue as GSR/CRS-1 routers don't support congestion aware
policing and have no 'priority percent' option therefore I have used
strict police command with priority as mentioned in your DSCPEF class.

Best Regards

Irfan Azher
CCNA,CCIP....

On Mon, Apr 27, 2009 at 4:49 PM, Ahmed Elhoussiny <aelhoussiny_at_gmail.com>wrote:

> Dear all,
> Hope your doing great, i would like to know if any one
> experienced or tried this before, or tried it, as tehre isnt an IOS XR
> simultaor as far as i know.
>
> I have designed the following QOS policy based on customer requirement &
> inputs.
>
> cmds are on GSR/CRS-1 IOS-XR ver 3.6.1
>
>
> int gix/y/z
>
> max-reserved-bandwidth 90
>
> service policy output *PE-OUT*
>
>
>
> policy-map *PE-OUT*
>
> class DSCPEF
>
> set ipv4 dscp ef
>
> *police rate percent 25*
>
> conform-action transmit
>
> exceed-action drop
>
> priority
>
> !
>
> class DSCPAF4
>
> set ipv4 dscp af41
>
> Bandwidth percent 17
>
> random-detect dscp
>
> !
>
> Class DSCPAF3
>
> set ipv4 dscp af31
>
> bandwidth percent 25
>
> random-detect dscp
>
> !
>
> Class DSCPAF2
>
> set ipv4 dscp af21
>
> bandwidth percent 20
>
> random-detect dscp
>
> !
>
> Class CS6
>
> bandwidth percent 3
>
> !
>
> Class class-default
>
> Fair-queue
>
> random-detect
>
>
> As recommended by Cisco Doc for IOS XR , I have enabled priority & policing
> for VOIP/Signaling (EF class), This policer ensures that the priority
> traffic does not starve all other traffic on the line card, which protects
> low-priority traffic from starvation.
>
> All other classes were configured to guarantee min. BW using the Bandwidth
> cmd.
>
>
> So after this, the customer advised that he need no Policing on the
> VOIP/Signaling
> (EF class), so it can allocate as much BW as possible without policing in
> case of conguestion, Put in mind that im working on an IP/MPLS NGN for
> mobile operator.!!!!
>
>
>
> *So what will happen if i removed the policing from the VOIP class & kept
> only the priority cmd:*
>
> *
> *
>
> *1- Will it be like Dynamic Priority BW alocation for the VOIP class if
> there is avalaiable BW & will it starve the BW in case of conguestion ?
> *
>
> *
> *
>
> *2- Will it be like Dynamic Priority BW alocation for the VOIP class if
> there is avalaiable BW, but will be stopped in case of conguestion as there
> are minmum BW garntee for other queues based on the cmd bandwidth percent.
> *
>
>
>
> Appretiate your advise.
>
> -----------------------------------
> Thanks & B.regards
> Ahmed Elhoussiny,CCIE# 21988 (R&S)
> Network Consultant & Cisco Academy Instructor
>
>
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Received on Tue Apr 28 2009 - 13:05:07 ART