Define Class Maps

1. The first thing to do is to define the names of the CoS classes. In menu bar, click Network > QoS > CoS Classes.

   The CoS Classes window appears.

   Figure 1: Names of CoS Classes

   If router configuration files with CoS class definitions were parsed, the classes defined in the configuration files will appear here. Only eight unique classes (default, priority, and six additional classes) can be defined in the network model-- these eight classes are called primary classes. In a network with more than eight classes, each additional class must be mapped as an alias of one of the eight primary classes. When importing configuration files, the parser will automatically perform the alias mapping through a best-approximation algorithm that takes into account the EXP, IP Precedence, and DSCP bits assigned to each class. If this approximation is off, the user can modify the alias mappings here.

2. Click on the Add button to add a new class. Enter a class name, select an alias from the CoS Alias drop-down box, and choose whether or not you want it to be a primary class by checking the Make Primary Class box. Then click on the OK button. You may add as many CoS classes as needed.

   Figure 2: Add CoS Class

   Note that you can have multiple CoS Classnames that correspond to the same CoS Alias. However, one and exactly one of these must be declared as the Primary Class for each CoS Alias. These CoS Classnames that are declared as the Primary Class will be populated in the Primary Classes panel.

3. To modify a CoS class, select it from the “All Classes” panel and click on the Modify button. After all changes have been made to the CoS class, click on the OK button.

DEFAULT class

If traffic does not satisfy the match criteria of other classes included in the policy map, then that traffic is treated as part of the “default” traffic.

PRIORITY class

The entry after “default” would be considered the “priority” class, however it may be changed. The Priority class is for priority queueing, which is also called Low Latency Queueing. Packets belonging to the priority class are sent before other packets.

You may check to see if there are any errors in the CoS class definitions or any conflicts with CoS policies by clicking on the Check button.

When done, click OK to submit changes to the server.

Related Cisco Commands

Router(config) # class-map class-map-name