Marking the DE bit

The discard eligibility (DE) bit in an FR frame determines the drop precedence of the frame at times of congestion: if the DE bit is 1, the frame is dropped preferentially.

You can set the DE bit for an FR traffic class to redefine its drop precedence.

To set the DE bit for an FR class:

Step

Command

Remarks

1. Enter system view.

system-view

N/A

2. Configure a traffic class.

  1. Create a traffic class and enter class view:traffic classifier tcl-name [ operator { and | or } ]

  2. Configure the match criteria:if-match [ not ] match-criteria

  3. Exit class view:quit

N/A

3. Configure a behavior with the action of marking the DE bit.

  1. Create a behavior and enter behavior view:traffic behavior behavior-name

  2. Configure the DE bit marking action:remark fr-de fr-de-value

  3. Exit behavior view:quit

N/A

4. Configure a policy.

  1. Create a policy and enter the policy view:qos policy policy-name

  2. Associate the class with the traffic behavior in the QoS policy:classifier tcl-name behavior behavior-name

  3. Exit policy view:quit

N/A

5. Apply the QoS policy to an FR class.

  1. Enter FR class view:fr class class-name

  2. Apply the QoS policy to the FR class:apply policy policy-name outbound

  3. Exit FR class view:quit

N/A

6. Associate the FR class with an FR interface or FR PVC.

(Method 1) Associate the FR class with an FR interface

  1. Enter FR interface view:interface interface-type interface-number

  2. Associate the FR class with the FR interface:fr-class class-name

Use either method or all.

By default, no FR class is associated with any FR interfaces or FR PVCs.

(Method 2) Associate the FR class with an FR PVC

  1. Enter FR interface view:interface interface-type interface-number

  2. Enter FR PVC view:fr dlci dlci

  3. Associate the FR class with the FR PVC:fr-class class-name

For more information about configuring traffic classes, traffic behaviors, and QoS policies, see HPE FlexNetwork MSR Router Series Comware 5 ACL and QoS Configuration Guide.

For more information about configuring FR classes, see HPE FlexNetwork MSR Router Series Comware 5 ACL and QoS Configuration Guide.