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Defining Custom Frame Relay Rewrite Rule on IQE PICs

For Juniper Networks device interfaces with the Frame Relay encapsulation, you can rewrite the discard eligibility (DE) bit based on the loss priority of the Frame Relay traffic. A rewrite rule sets the DE bit to the class-of-service (CoS) value 0 or 1 based on the assigned loss priority of low, medium-low, medium-high, or high for each outgoing frame.

To define a Frame Relay DE bit rewrite rule:

  1. Specify the rewrite rule for Frame Relay DE bit based on the loss priority at the [edit class-of-service loss-priority-rewrites] hierarchy level.
    [edit class-of-service loss-priority-rewrites]user@host# set frame-relay-de name loss-priority level code-point [ alias | bits ];

    For example:

    [edit class-of-service loss-priority-rewrites]user@host# set frame-relay-de fr_rw loss-priority low code-point 0;user@host# set frame-relay-de fr_rw loss-priority high code-point 0;user@host# set frame-relay-de fr_rw loss-priority medium-low code-point 1;user@host# set frame-relay-de fr_rw loss-priority medium-high code-point 1;

    Note: The rewrite rule does not take effect until you apply it to a logical interface.

  2. Apply a rule to a logical interface.
    [edit class-of-service interfaces interface-name unit logical-unit-number loss-priority-rewrites]user@host# set frame-relay-de name;

    For example:

    [edit class-of-service interfaces so-1/0/0 unit 0 loss-priority-rewrites]user@host# set frame-relay-de fr_rw;
  3. Verify the configuration in operational mode.
    user@host> show class-of-service loss-priority-rewrite 
    Loss-priority-rewrite: frame-relay-de-fr_rw, Code point type: frame-relay-de, Index: 38
  Loss priority      Code point
  low                 0         
  high                0  
  medium-low          1  
  medium-high         1
 

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Published: 2013-07-31

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