QoS question in Cisco router

[andyhung232]

Hi Experts,

I have question about QoS in router? I am not sure use which QoS feature to do that?

1.       Traffic classification for classifying the customer incoming traffic to  router by marking different IP precedence nature.
2.      Traffic queuing for prioritizing the customer traffic outgoing  from the router according to classified IP precedence of incoming  traffic

Thanks

Andy

[cadet alain]

Hi,

You can do both with MQC.

1) classification is done inside  a class-map where you can classify on DSCP,IPP,ACL,NBAR,etc.

2) you can mark inside a policy-map with the set command for the corresponding class of traffic

3) queueing is made with CBWFQ or LLQ: using bandwidth or priority command inside a policy-map.

Let's take an example:

We can classify into 2 classes: http and pings

class-map HTTP

match protocol http     we are using NBAR here

class-map  ICMP

match access-group 101    we are using an ACL here

Then we can mark each type of trafffic with DSCP

policy-map MARK

class HTTP

set dscp af41

class ICMP

set dscp cs0

For the queuing here is an example:

policy-map HTTP

class HTTP

bandwidth 8000

class ICMP

bandwidth 4000

Then you must apply policy with the service-policy input|output command  Queuing can only be applied outbound

These are only simple examples you can see more here:

http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/qos_mqc.html

http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/fqos_c.html

Regards.

Alain.

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information  contained within this posting without consideration and with the  reader's understanding that there's no implied or expressed suitability  or fitness for any purpose.  Information provided is for informational  purposes only and should not be construed as rendering professional  advice of any kind.  Usage of this posting's information is solely at  reader's own risk.

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Posting

Cadet Alain's post pretty much covers your question.  However, you did ask about IP Precedence.  You can use that where Cadet uses DSCP, although DSCP is a newer standard for using the ToS byte.

Also in Cadet's  post, he is using the same classifcation class maps for the outbound policy, but you can use different class maps that match on IP Precedence and/or DSCP that the inbound policy set.

Further, in later IOS images, you can also mark in the outbound policy.  Being able to do that, if supported, or using non-ToS marking class maps in the outbound policy often means you don't actually need to do an inbound policy.

[andyhung232]

Hi Joseph,

Thanks a lot. But may I know which QoS feature name can support these. Becuase I need to ensure the router IOS (IP Base or IP Service etc..) which can support.

Thanks

Andy

[Thotsaphon Lueangwattanaphong]

Hi,

   What you are going to do is Marking and CBWFQ(Might Be).

   IPBase is fine to do that.

   QOS Ref: http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/qos_mqc.html

HTH,

Toshi

[Joseph W. Doherty]

Disclaimer

The  Author of this posting offers the information  contained within this  posting without consideration and with the  reader's understanding that  there's no implied or expressed suitability  or fitness for any  purpose.  Information provided is for informational  purposes only and  should not be construed as rendering professional  advice of any kind.   Usage of this posting's information is solely at  reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages  whatsoever (including,  without limitation, damages for loss of use, data  or profit) arising  out of the use or inability to use the posting's  information even if  Author has been advised of the possibility of such  damage.

Posting

As the other poster notes, CBWFQ or Class-based Weighted Fair Queuing, would be the feature that's been described.  Believe it's not so much IOS feature related, i.e. IP Based vs. Enterprise, but its capabilities do vary based on IOS version and hardware platform.