QOS in the Core

Unanswered Question
Feb 24th, 2007

i have following QOS requirements

Class 1 EF 41% bw > LLC Queue (implemented with the priority command, not priority percent)

Class 2a AF31 30% bw > bandwidth percent 30

Class 2bAF41 20% bw > bandwidth percent 20

Class 3 best effort (remaining)

Link Capacity e.g 10G Ethernet

AF guarantees througput and low loss, EF low delay and jitter

My question is, do i need to police EF traffic or not? I beleive yes, because if EF allocates more bw than 41%, AF will probably tail droped. I dont want AF gets droped as long AF is below or equal the assigned bandwidth in my service policy

I have this problem too.
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lkrucker Sun, 02/25/2007 - 14:20

something to add to provide more information

On the core router, i connect severeal PE routers with 1G links. The agregated bw of all PE class 1 traffic could overload the total amount of reserved bw for Class 1 on that core box

This is a design question, maybe some other design engineers could provide me some feedback



bvsnarayana03 Sun, 02/25/2007 - 23:11


You may not need any additional policing. Priorit by deafault has policing integrated in to it, which comes in to play only when the link is congested. As long as link is free, priority ensures u get that min BW.

In any case, AF may not get taildropped due to EF.


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