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08-05-2013 02:12 PM
08-05-2013 02:12 PM
Qos using dscp remarking.
Hello folks. I am testing some options of qos. Actually dscp remarking.
But it is not working. I am remarking the dscp field to EF(46). It has no effect.
On the other hand when I remark dot1p field to 5, the tests works fine.
Why remarking dot1p works fine and remarking dscp does not ?
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08-11-2013 03:27 AM
08-11-2013 03:27 AM
Re: Qos using dscp remarking.
Hi,
can you pls provide your config example ?
Also note that simply remarking the dscp value does not mean the traffic will be handled by a dedicated queue, so 2 actions may be required if that is what you want,
best regards,Peter
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08-12-2013 11:40 AM - edited 08-12-2013 11:53 AM
08-12-2013 11:40 AM - edited 08-12-2013 11:53 AM
Re: Qos using dscp remarking.
I Peter, thanks for your reply.
I am using two switches (5500) with a just 10 mbps uplink between them to use 100% of its bandwidth.
There are two computer connected to one of the switches sending traffic to a third computer
connected to the second notebook. All three computers witch Gpbs network cards.
With the uplink at 100% of utilization I tried the test described above to verify if
the Qos works as expected priorizing the traffic of one of the computers
More details after the configuration commands.
The configuration I am using is a very simple one.:
#simple acl to aply de Qos only do ip 10.0.0.1
acl number 3100
rule 5 permit ip source 10.0.0.1
# traffic classifier for the Acl above
traffic classifier testeQOS operator and
if-match acl 3100
# Behavior marking dscp as ef (46)
traffic behavior testeQOS. When I use: remark dot1p 5 or 6 ou 7 it works fine.
remark dscp ef
# Policy binding the classifier to the behavior
qos policy testeQOS
classifier testeQOS behavior testeQOS
#appling the qos policy to vlan 2 inbound, where is the computer with ip 10.0.0.1
qos vlan-policy testeQOS vlan 2 inbound
To test this policy I generate traffic from computer 10.0.0.1 and from computer 10.0.0.2 with a software
called JPerf. Before applying the Qos both computer transmit data at the same rate.
After the Qos policy is applied, the computer 10.0.0.1 has its transmission rate increased and the computer
10.0.0.2 has its transmission rate decrased, but only if my behavior use the command "remark dot1p 5".
Using only the command "remark dscp ef" there is no effect with the transmission rates. They keep
exactly the same trasmission rate proving that there is no priority being applied.
Thanks for your interest.
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08-22-2013 01:47 PM
08-22-2013 01:47 PM
Re: Qos using dscp remarking.
This is normal behavior.
Remarking dscp is just what it is: remark dscp, but it will not process the packet in a dedicated queue.
Assigning the packet to a specific queue is done with
remark local-precedence x
This combination will have the desired effect.
Remark dot1p will also modify the internal local-precedence, which is why you see the different behavior.
Hope this helps,Peter