Configuring Schedulers

You use schedulers to define the properties of output queues. These properties include the amount of interface bandwidth assigned to the queue, the size of the memory buffer allocated for storing packets, the priority of the queue, and the random early detection (RED) drop profiles associated with the queue.

You associate the schedulers with forwarding classes by means of scheduler maps. You can then associate each scheduler map with an interface, thereby configuring the hardware queues, packet schedulers, and RED processes that operate according to this mapping.

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

class-of-service {

    interfaces {

        interface-name {

            scheduler-map map-name;

            scheduler-map-chassis map-name;

            shaping-rate rate;

            unit logical-unit-number {

                output-traffic-control-profile profile-name;

                scheduler-map map-name;

                shaping-rate rate;

            }

        }

    }

    fabric {

        scheduler-map {

            priority (high | low) scheduler scheduler-name;

        }

    }

    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 | low | medium-low | medium-high | high) 
                     protocol (any | non-tcp | tcp) drop-profile profile-name;

            priority priority-level;

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

        }

    }

    traffic-control-profiles profile-name {

        delay-buffer-rate (percent percentage | rate);

        guaranteed-rate (percent percentage | rate);

        scheduler-map map-name;

        shaping-rate (percent percentage | rate);

    }

}

This chapter discusses the following topics:

• Default Schedulers
• Configuring a Scheduler
• Configuring the Scheduler Map
• Associating the Scheduler Map