From: Nadeem Ansari (nadeem.ansari574@gmail.com)
Date: Fri Feb 27 2009 - 07:19:37 ARST
Control traffic does not fall in class-default as per my understanding,
Remaining bandwidth other than reservation will be used for routing
protocols and other control traffic.
Class-default is unspecified user traffic, but there is one catch whatever
QoS you do your control traffic will take preferance over your other defined
and undefined traffics.
Hope somebody correct me if I am wrong :)
Regards
Nadeem
On Fri, Feb 27, 2009 at 2:25 PM, Ali Simaan <alisimaan@gmail.com> wrote:
> Hi All
>
> I am confused about this CBWFQ logic.
>
> In all Cisco QOS Documentation they state that when adjusting an interfaces
> max-reserved bandwidth above 75% extreme caution is required to ensure that
> one leaves enough remaining bandwidth to support best effort, control and
> layer 2 overhead traffic. I understand that all unclassified traffic is
> assigned to the class-default class. However is the control and layer 2
> overhead traffic also assigned to the class-default class or does it sit
> somewhere else?
>
> If i configure a router as below and have reserved 100% of the interface
> bandwidth and assigned class-default 25%, is the control and layer 2
> overhead traffic actually still getting the same kind of service, or are
> there risks with this configuration?
>
>
>
>
> interface Serial0/0
> bandwidth 128
> ip address 131.1.12.1 255.255.255.0
> max-reserved bandwidth 100
> service policy output QOS
>
>
> policy-map QOS
> class 1
> bandwith percent 75
>
> class class-default
> bandwidth percent 25
>
>
>
>
> Also how would the cbwfq logic work if i had only assigned 20 percent to
> the
> class-default class? Where would the other 5 % that is not assigned to any
> class sit and what would be assigned to it?
>
>
> Hope someone can shed some light on this.
>
> Thanking you in advance
> Ali
>
>
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