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Example: Configuring Classifiers, Rewrite Markers, and Schedulers

  1. Define a classifier that matches IP traffic arriving on the interface. The affected IP traffic has IP precedence bits with patterns matching those defined by aliases A or B. The loss priority of the matching packets is set to low, and the forwarding class is mapped to best effort (queue 0):
    [edit]class-of-service {classifiers {inet-precedence normal-traffic {forwarding-class best-effort {loss-priority low code-points [my1 my2];}}}}

    Following are the code-point alias and forwarding-class mappings referenced in the normal-traffic classifier:

    [edit]class-of-service {code-point-aliases {inet-precedence {my1 000;my2 001;...}}} [edit]class-of-service {forwarding-classes {queue 0 best-effort;queue 1 expedited-forwarding;}}
  2. Use rewrite markers to redefine the bit pattern of outgoing packets. Assign the new bit pattern based on specified forwarding classes, regardless of the loss priority of the packets:
    [edit]class-of-service {rewrite-rules {inet-precedence clear-prec {forwarding-class best-effort {loss-priority low code-point 000;loss-priority high code-point 000;}forwarding-class expedited-forwarding {loss-priority low code-point 100;loss-priority high code-point 100;}}}}
  3. Configure a scheduler map associating forwarding classes with schedulers and drop-profiles:
    [edit]class-of-service {scheduler-maps {one {forwarding-class expedited-forwarding scheduler special;forwarding-class best-effort scheduler normal;}}}

    Schedulers establish how to handle the traffic within the output queue for transmission onto the wire. Following is the scheduler referenced in scheduler map one:

    [edit]class-of-service {schedulers {special {transmit-rate percent 30;priority high;}normal {transmit-rate percent 70;priority low;}}}
  4. Apply the normal-traffic classifier to all SONET/SDH interfaces and all logical interfaces of SONET/SDH interfaces; apply the clear-prec rewrite marker to all Gigabit Ethernet interfaces and all logical interfaces of Gigabit Ethernet interfaces; and apply the one scheduler map to all interfaces:
    [edit]class-of-service {interfaces {so-0/0/0 {scheduler-map one;unit 0 {classifiers {inet-precedence normal-traffic;}}}so-0/0/1 {scheduler-map one;unit 1 {classifiers {inet-precedence normal-traffic;}}}ge-1/0/0 {scheduler-map one;unit 0 {rewrite-rules {inet-precedence clear-prec;}}unit 1 {rewrite-rules {inet-precedence clear-prec;}}}ge-1/0/1 {scheduler-map one;unit 0 {rewrite-rules {inet-precedence clear-prec;}}unit 1 {rewrite-rules {inet-precedence clear-prec;}}}}}

    Following is the complete configuration:

    [edit class-of-service]classifiers {inet-precedence normal-traffic {forwarding-class best-effort {loss-priority low code-points [my1 my2];}}}code-point-aliases {inet-precedence {my1 000;my2 001;cs1 010;cs2 011;cs3 100;cs4 101;cs5 110;cs6 111;}}drop-profiles {high-priority {fill-level 20 drop-probability 100;}low-priority {fill-level 90 drop-probability 95;}big-queue {fill-level 100 drop-probability 100;}}forwarding-classes {queue 0 best-effort;queue 1 expedited-forwarding;}interfaces {so-0/0/0 {scheduler-map one;unit 0 {classifiers {inet-precedence normal-traffic;}}}so-0/0/1 {scheduler-map one;unit 1 {classifiers {inet-precedence normal-traffic;}}}ge-1/0/0 {scheduler-map one;unit 0 {rewrite-rules {inet-precedence clear-prec;}}unit 1 {rewrite-rules {inet-precedence clear-prec;}}}ge-1/0/1 {scheduler-map one;unit 0 {rewrite-rules {inet-precedence clear-prec;}}unit 1 {rewrite-rules {inet-precedence clear-prec;}}}}rewrite-rules {inet-precedence clear-prec {forwarding-class best-effort {loss-priority low code-point 000;loss-priority high code-point 000;}forwarding-class expedited-forwarding {loss-priority low code-point 100;loss-priority high code-point 100;}}}scheduler-maps {one {forwarding-class expedited-forwarding scheduler special;forwarding-class best-effort scheduler normal;}}schedulers {special {transmit-rate percent 30;priority high;}normal {transmit-rate percent 70;priority low;}}

Published: 2010-04-15

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