OT : IOS XR QOS using priority/LLQ without policing

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

Blogs and organic groups at http://www.ccie.net
Received on Mon Apr 27 2009 - 13:49:44 ART