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QOS for web applications

I'm looking to implement qos for our web applications. I would like to give client pc's priority access to our web server. The server resides at our central office and the clients reside in an off site location connected via a frame relay circuit.

On the remote router I have created an acl defining traffic from the client pc's to the server and created class maps matching that acl. I created a policy map setting the dscp to af33 on the class-map and assigned the policy to the fastethernet input.

I see the traffic being marked, but I'm pretty sure I'm missing something.

What other actions need to be taken to give this traffic priority? Am I even close to getting this right?

Thanks in advance.

Dan Cox

1 REPLY
Blue

Re: QOS for web applications

You are halfway there. The packets are marked, but you need an output service policy on the frame relay side. Define a class map to match on the AF33 packets, then define a policy map that gives that class either a set bandwidth or percentage of available. Here is an example:

class-map match-any Web

description Web

match ip dscp af33

!

policy-map Frame

class Web

bandwidth 128

class class-default

fair-queue

random-detect dscp-based

This would assign 128 kb to your Web traffic, and fair queue the rest of the traffic, with WRED.

You will need to then set this as a service policy out on the frame circuit, which is often done with a frame class map, but this will depend on how your frame relay is configured.

map-class frame-relay WAN128

frame-relay adaptive-shaping becn

frame-relay cir 256000

frame-relay bc 16000

frame-relay mincir 128000

service-policy output Frame

!

interface Serial2/1:1.2 point-to-point

bandwidth 256

ip address 10.X.X.X 255.255.255.252

frame-relay class WAN128

To see if it is working:

sh policy-map int s2/1:1.2

It is possible to just use your access list based class to identify the Web traffic through the output service policy, but it is best practice to do it the way you have started; mark packets on ingress, then use DSCP on the output side. This makes it simplier if the traffic traverses multiple routers.

This applies QOS from the remote router back to the local site, but normally you would also configure QOS from the local site to the remote site as well.

Please rate helpful posts.

Dave

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