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.
To change the override value:
- Click the Set tab.
- From the Type list, select DSCP
if you want to override the DSCP values. Otherwise, select None.
- If you chose DSCP, enter
the DSCP override value in the DSCP field.
On the Set/Trust tab, you can take either of these actions:
- Change the DSCP or IP precedence override value, if one was previously specified.
- Change the trust setting for the packets
To change the override value:
- Click the Set radio button to enable the Set section.
- 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.
- If you chose DSCP, enter
the DSCP override value in the DSCP field.
- If you chose IP Precedence, enter
the IP precedence override value in the IP Precedence field.
To change the trust setting:
- Click the Trust radio button to enable the Trust section.
- From the Trust Type list, select a different
trust setting from the one currently in effect.
On the Policer tab, you see the settings for the policer,
if any, that is associated with the class.
- The Policers list shows the last policer
choice you made for the class -- an aggregate
policer, a non-aggregate policer, or no policer. You can make any of these
choices:
- Go from No Policer to an aggregate policer or Define Policer.
- Go from a non-aggregate policer to an aggregate policer, Define Policer,
or No Policer.
- Go from an aggregate policer to Define Policer or No Policer.
If you select No Policer, ignore the remaining steps.
No 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.
- In the Policer Name field, enter a name
in either of these cases:
- You are defining an aggregate policer.
- You want to turn a non-aggregating policer into an aggregating one.
Restriction: This option is not supported on Catalyst 2950 switches.
- 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.
- 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.
- 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.
- If you selected Police DSCP
and Transmit, select 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.