From: Nadeem Ansari (nadeem.ansari574@gmail.com)
Date: Fri Feb 27 2009 - 08:07:16 ARST
HI Folks,
I am corrcting myself and it is true that control traffic like routing
protocol falls in class-default.
But this is also true that control traffic will be given preferance over
other traffic sitting in same class
Regards
Nadeem
On Fri, Feb 27, 2009 at 2:49 PM, Nadeem Ansari
<nadeem.ansari574@gmail.com>wrote:
> 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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>>
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