Modify Class in QoS Policy Window

This window appears when you select a class and click Modify in the Modify QoS Policy window. Use it to:

When you complete these tasks, click OK.

Changing an Override Value on Catalyst 2950 Switches

To change the override value:

  1. Click the Set tab.
  2. From the Type list, select DSCP if you want to override the DSCP values. Otherwise, select None.
  3. If you chose DSCP, enter the DSCP override value in the DSCP field.

Changing an Override Value or Trust Setting on Catalyst 3550 Switches

On the Set/Trust tab, you can take either of these actions:

To change the override value:

  1. Click the Set radio button to enable the Set section.
  2. From the Set list, select DSCP or IP Precedence if you want to change the DSCP or IP precedence value that overrides DSCP values, IP precedence values, or an ACL name in matching packets. Otherwise, select None.
  3. If you chose DSCP, enter the DSCP override value in the DSCP field.
  4. If you chose IP Precedence, enter the IP precedence override value in the IP Precedence field.

To change the trust setting:

  1. Click the Trust radio button to enable the Trust section.
  2. From the Trust Type list, select a different trust setting from the one currently in effect.

Changing the Associated Policer

On the Policer tab, you see the settings for the policer, if any, that is associated with the class.

  1. The Policers list shows the last policer choice you made for the classan aggregate policer, a non-aggregate policer, or no policer. You can make any of these choices: If you select No Policer , ignore the remaining steps. N o policing is associated with the class.
    If you select an aggregate policer , the fields in the Policer Definition box are filled in for you, and this task is complete.
    If you select Define Policer , continue to the next step.
  2. In the Policer Name field, enter a name in either of these cases:
    Restriction: This option is not supported on Catalyst 2950 switches.
  3. In the Rate [kbps] field, enter the maximum transmission rate that you will permit on the interface. The number that you enter is assumed to be kilobits per second.
  4. In the Max Burst Size [KB] field, enter the maximum burst size that you will permit on the interface. The number that you enter is the size in kilobytes.
  5. In the Exceed Action list, select an action you want to occur if either maximum is exceeded. Selecting Drop causes the policer to drop a packet in violation; selecting Police DSCP and Transmit, causes the policer to modify the DSCP number and transmit the packet.
  6. If you selected Police DSCP and Transmit, s elect a DSCP value from the Policed DSCP field that the policer will give to a packet in violation.
    Note: This field is available only for Catalyst 2950 switches. For Catalyst 3550 switches, the policer uses the DSCP value it finds in the Policed DSCP Table.