How to confiqure QoS in Cisco 6500 Switches

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Tags:
Cisco
Cisco 6500
Cisco switches
Edge switches
QoS
Quality of Service
Switch configuration
Switches
Dear Friends, I am planning to configure QOS in our network which comprises of Cisco 6500 Series Swicthes as Core/Distribution and Cisco 3560 Switches as Edge Swicthes. We don't have any IP telephony services. Please let me know the sample configurations.

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Configure QoS
Let’s review the steps to configuring QoS on a Cisco router.

Step 1: Define the traffic

You must tell the router which traffic you want to give QoS, which you can accomplish either using an access control list (ACL) or using Network Based Application Recognition (NBAR). An ACL is the traditional way to define any traffic for a router.

With NBAR, however, the router just recognizes the traffic traveling through the router—it knows that HTTP is HTTP, Skype is Skype, etc. But there’s a limited list of protocols and applications that the router recognizes.

While the router won’t recognize every single application, each IOS upgrade adds more to the list. In addition, you can create custom application recognition files.

Step 2: Create a class-map

A class-map defines the traffic into groups. For example, you could create a class-map called VoIP traffic and put all VoIP protocols under it.

Step 3: Create a policy-map

A policy-map matches the classes from the class-map with how much bandwidth and/or priority you want to give this traffic.

Step 4: Apply the policy-map to the interface

Like an ACL, you must apply the policy-map to the specific interface you want it to affect. You can apply the policy-map in either output or input mode. Here’s the command to use:

service-policy output|input {name of policy-map}If you’re using NBAR to recognize the traffic, you must also use the ip nbar protocol-discovery command on the interface. This enables NBAR to begin looking at the traffic.

Download the QoS template
Now that you know the basic steps to configuring QoS, you can get started with our downloadable QoS template. (This is the same template that TechRepublic’s George Ou has used to explain how to configure the Cisco 871W router for basic configurations, advanced 871W configurations, and an IPSec site-to-site VPN.)

Follow these steps:

Download the template.
Open the Excel file, and fill out the yellow sections on the Variables worksheet.
Click the Replace button; it will generate the appropriate QoS configuration on a new sheet called QOS-1.
Copy the configuration from the Excel file, and paste it into the Cisco CLI. You can copy directly from Excel into a Telnet or SSH session or even the console port.

—————————————————

Here is a template

<pre>
Access-list 150 Permit TCP any any eq !Critical Ports
Access-list 151 Permit TCP any any eq !Less Critical Ports

Class-map match-all CRITICAL
Match access-group 150
Class-map match-all LESSCRITICAL
Match access-group 151

Policy-map QoS
Class CRITICAL
Priority Percent 50
Class LESSCRITICAL
Priority Percent 49
Class class-default
set dscp default
Fair-queue
random-detect

Interface FA 3/23
Service-policy output QoS</pre>

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