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Posted by on April 30, 2008, 12:55 am
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For DSCP, Which one has higher priority
AF1 and AF4?
My answer is AF4. but same book give AF2 for web traffic
and AF4 for rest of traffic.
Thanks,
st
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Posted by fugettaboutit on April 30, 2008, 7:23 am
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AF1 through AF4 have the same "priority", they are simply different
classes. However, in the case of AFx1 vs. AFx4, AFx4 will have a higher
drop probability.
You'd want to perhaps assign your web traffic to a different queue
relative to another traffic type.
AF1x = Class 1
AF2x = Class 2
AF3x = Class 3
AF4x = Class 4
x = 1, 2, 3, or 4 and determines the drop probability
aaabbb16@hotmail.com wrote:
> For DSCP, Which one has higher priority
> AF1 and AF4?
> My answer is AF4. but same book give AF2 for web traffic
> and AF4 for rest of traffic.
>
> Thanks,
> st
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Posted by on April 30, 2008, 12:31 pm
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> wrote:
> AF1 through AF4 have the same "priority", they are simply different
> classes. However, in the case of AFx1 vs. AFx4, AFx4 will have a higher
> drop probability.
>
> You'd want to perhaps assign your web traffic to a different queue
> relative to another traffic type.
>
> AF1x =3D Class 1
> AF2x =3D Class 2
> AF3x =3D Class 3
> AF4x =3D Class 4
>
> x =3D 1, 2, 3, or 4 and determines the drop probability
>
>
>
> aaabb...@hotmail.com wrote:
> > For DSCP, Which one has higher priority
> > AF1 and AF4?
> > My answer is AF4. but same book give AF2 for web traffic
> > and AF4 for rest of traffic.
>
> > Thanks,
> > st- =D2=FE=B2=D8=B1=BB=D2=FD=D3=C3=CE=C4=D7=D6 -
>
> - =CF=D4=CA=BE=D2=FD=D3=C3=B5=C4=CE=C4=D7=D6 -
Thanks,
For six bits DSCP, I know 3 bits for classes, 2 bits for drop
probability
1 bit not used. I think 2 bits means "low, midium and high drop" 01,10
and 11.
If I set one traffic AF11 and second traffic is AF41, Based on your
answer,
they have same priority, right?
Why does some book say AF4 is more important than AF1?
I know for IP precedence 100 has high priority than 001.
st
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Posted by fugettaboutit on April 30, 2008, 1:33 pm
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>> AF1 through AF4 have the same "priority", they are simply different
>> classes. However, in the case of AFx1 vs. AFx4, AFx4 will have a higher
>> drop probability.
>>
>> You'd want to perhaps assign your web traffic to a different queue
>> relative to another traffic type.
>>
>> AF1x = Class 1
>> AF2x = Class 2
>> AF3x = Class 3
>> AF4x = Class 4
>>
>> x = 1, 2, 3, or 4 and determines the drop probability
>>
>>
>>
>> aaabb...@hotmail.com wrote:
>>> For DSCP, Which one has higher priority
>>> AF1 and AF4?
>>> My answer is AF4. but same book give AF2 for web traffic
>>> and AF4 for rest of traffic.
>>> Thanks,
>>> st- 隐藏被引用文字 -
>> - 显示引用的文字 -
>
> Thanks,
> For six bits DSCP, I know 3 bits for classes, 2 bits for drop
> probability
> 1 bit not used. I think 2 bits means "low, midium and high drop" 01,10
> and 11.
> If I set one traffic AF11 and second traffic is AF41, Based on your
> answer,
> they have same priority, right?
> Why does some book say AF4 is more important than AF1?
> I know for IP precedence 100 has high priority than 001.
>
> st
Well, see, that's the thing. I read the RFC and it seemed a little
ambiguous. I have the CiscoPress ONT book, and it's adamant that AF4x
vs. AF1x is simply a class distinction. I always thought the same as you
that there was indeed a difference. Now, if you use the DSCP class
selector (CS1 - 7), then yes, those matter as they'd be processed by
non-DSCP compliant nodes.
I'd love to find a clear explanation of the AF classes. As I said, I
didn't come away from the RFC with a much better understanding. The
Cisco ONT book is the "clearest" one I've seen so far... :-)
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Posted by News Reader on April 30, 2008, 1:52 pm
If you were Registered and logged in, you could reply and use other advanced thread options >
> Well, see, that's the thing. I read the RFC and it seemed a little
> ambiguous. I have the CiscoPress ONT book, and it's adamant that AF4x
> vs. AF1x is simply a class distinction. I always thought the same as you
> that there was indeed a difference. Now, if you use the DSCP class
> selector (CS1 - 7), then yes, those matter as they'd be processed by
> non-DSCP compliant nodes.
>
> I'd love to find a clear explanation of the AF classes. As I said, I
> didn't come away from the RFC with a much better understanding. The
> Cisco ONT book is the "clearest" one I've seen so far... :-)
Try these:
http://www.cisco.com/en/US/technologies/tk543/tk759/technologies_white_paper0900aecd80295abf.pdf
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6558/ps6610/product_data_sheet0900aecd8031b36d.pdf
http://www.cisco.com/en/US/technologies/tk543/tk766/technologies_white_paper09186a00800a3e2f.pdf
Best Regards,
News Reader
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