CCNP Certification Exam Training:
Creating A QoS Policy
By Chris Bryant, CCIE #12933
If you work with QoS at any level - and sooner or later, you will - you've got to know how to write and apply QoS policies.
Creating and applying such a policy is a three-step process.
Create a QoS class to identify the traffic that will be affected by the policy.
Create a QoS policy containing the actions to be taken by traffic identified by the class.
Apply the policy to the appropriate interfaces.
If the phrase "identify the traffic" sounds like it's time to write an access-list, you're right! Writing an ACL is one of two ways to classify traffic, and is the more common of the two. Before we get to the less-common method, let's take a look at how to use an ACL to classify traffic.
You can use either a standard or extended ACL with QoS policies. The ACL will be written separately, and then called from the class map.
SW1(config)#access-list 105 permit tcp any any eq 80
SW1(config)#class-map WEBTRAFFIC
SW1(config-cmap)#match access-group 105
Now that we've identified the traffic to be affected by the policy, we better get around to writing the policy! QoS policies are configured with the policy-map command, and each clause of the policy will contain an action to be taken to traffic matching that clause.
SW1(config)#policy-map LIMIT_WEBTRAFFIC_BANDWIDTH
SW1(config-pmap)#class WEBTRAFFIC
SW1(config-pmap-c)#police 5000000 exceed-action drop
SW1(config-pmap-c)#exit
This is a simple policy, but it illustrates the logic of QoS policies. The policy map LIMIT_WEBTRAFFIC_BANDWIDTH calls the map-class WEBTRAFFIC. We already know that all WWW traffic will match that map class, so any WWW traffic that exceeds the stated bandwidth limitation will be dropped.
Finally, apply the policy to the appropriate interface.
SW1(config-if)#service-policy LIMIT_WEBTRAFFIC_BANDWIDTH in
To your success,
Chris Bryant
CCIE #12933
"The Computer Certification Bulldog" chris@thebryantadvantage.com
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