Modify QoS Trust Settings Window

This window is only available for Catalyst 2950 and Catalyst 3550 switches. It appears when you select one or more interfaces and click Modify in the QoS Trust Settings window. Use it to change the specifications about the markerCoS, DSCP, or IP precedenceyou trust in the incoming packets.

Follow these steps:

  1. To change the marker you trust, select a different marker from the Trust State list, or select Not Trusted to specify no trust setting.
    You can perform this step with a Catalyst 2950 switch only if it runs the enhanced software image.
  2. If you selected Trust CoS, you can choose a default CoS value for the CoS Default field. This value is used when an incoming packet has no CoS value. Check the CoS Override box if you want the default to replace all CoS values in incoming packets.
    You can perform this step with all Catalyst 2950 switches.
  3. If you selected Trust DSCP and you want to map incoming DSCP values to a different set of DSCP values, select a mutation table from the DSCP Mutation Table list. Select Default if you do not want to change incoming DSCP values.
    You define the mutation tables in the list in the QoS Maps window.
  4. When you finish with the window, click OK. You return to the QoS Trust Settings window.