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CoS Configuration Guidelines

To configure class-of-service (CoS) properties, you can include the following statements at the [edit class-of-service] hierarchy level of the configuration: 

class-of-service {

    classifiers {

        type classifier-name {

            import (classifier-name | default);

            forwarding-class class-name {

                loss-priority level {

                    code-points [ aliases ] [ 6-bit-patterns ];

                }

            }

        }

    }

    code-point-aliases {

        (dscp | dscp-ipv6 | exp | ieee-802.1 | inet-precedence) {

            alias-name bits;

        }

    }

    drop-profiles {

        profile-name {

            fill-level percentage drop-probability percentage;

            interpolate {

                drop-probability [ values ];

                fill-level [ values ];

            }

        }

    }

    fabric {

        scheduler-map {

            priority (high | low) scheduler scheduler-name;

        }

    }

    forwarding-classes {

        queue queue-number class-name priority (high | low);

    }

    forwarding-policy {

        next-hop-map map-name {

            forwarding-class class-name {

                next-hop [ next-hop-name ];

                lsp-next-hop [ lsp-regular-expression ];

            }

        }

        class class-name {

            classification-override {

                forwarding-class class-name;

            }

        }

    }

    interfaces 

        interface-name {

            scheduler-map map-name;

            scheduler-map-chassis map-name;

            unit logical-unit-number {

                classifiers {

                    (dscp | dscp-ipv6 | exp | ieee-802.1 | inet-precedence) (classifier-name 
                        | default);

                }

                forwarding-class class-name;

                rewrite-rules {

                    dscp (rewrite-name | default);

                    dscp-ipv6 (rewrite-name | default);

                    exp (rewrite-name | default) protocol protocol-types;

                    exp-push-push-push default;

                    exp-swap-push-push default;

                    ieee-802.1 (rewrite-name | default);

                    inet-precedence (rewrite-name | default);

                }

                scheduler-map map-name;

                shaping-rate rate;

            }

        }

    }

    restricted-queues {

        forwarding-class class-name queue queue-number;

}

    rewrite-rules {

        (dscp | dscp-ipv6 | exp | ieee-802.1 | inet-precedence) rewrite-name {

            import (rewrite-name | default);

            forwarding-class class-name {

                loss-priority level code-point (alias | bits);

            }

        }

    }

    scheduler-maps {

        map-name {

            forwarding-class class-name scheduler scheduler-name;

        }

    }

    schedulers {

        scheduler-name {

            buffer-size (percent percentage | remainder | temporal microseconds);

            drop-profile-map loss-priority (any | high | low) protocol (any | non-tcp | tcp) 

                    drop-profile profile-name;

            priority priority-level;

            transmit-rate (rate | percent percentage | remainder) <exact>;

        }

    }

}

The following RFCs define the standards supported by certain aspects of the CoS software:

RFC 2983, Diffserv and Tunnels, is not supported.

The JUNOS software supports only two loss priorities and, by default, supports only one assured forwarding (AF) class, although you can configure more at the expense of other class types.

This chapter includes the following sections:

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