From: Nadeem Ansari (nadeem.ansari574@gmail.com)
Date: Fri Feb 27 2009 - 12:17:51 ARST
Gr8 work Pavel, I really appriciate it was very informative :)
Regards
Nadeem
On Fri, Feb 27, 2009 at 4:53 PM, Pavel Bykov <slidersv@gmail.com> wrote:
> We had a discussion about this a while ago, and because matters are much
> more deep and complicated, I had to carry out some testing.
> Here are the answers to "max-reserved-bandwidth" and 75/25% myth:
> http://www.boxoid.org/cisco/MAX-RESERVED-BANDWIDTH-AND-CBWFQ.pdf
>
> Especially check out chapter 6. Also, the documentation pertaining to this
> is changing, and so is the behaviour in different IOSes.
>
>
> On Fri, Feb 27, 2009 at 10:19 AM, 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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>>
>>
>>
>>
>>
>
>
> --
> Pavel Bykov
> ----------------
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