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Configuring Rate Limiting and Sharing of Excess Bandwidth on Multiservices PICs

date_range 29-Nov-23

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On Multiservices PICs, you can limit the transmit rate of a logical interface (lsq-) in the same way as other types of queuing PICs. You can also assign a percentage of the excess bandwidth to the logical interfaces. As with other types of PICs, the strict-high queue (voice) can “starve” low and medium priority queues. To prevent the strict-high queue from starving other queues, rate-limit the queue.

To rate-limit logical interfaces on a Multiservices PIC, include the transmit-rate statement with the rate-limit option at the [edit class-of-service schedulers scheduler-name] hierarchy level:

[edit class-of-service schedulers scheduler-name]
transmit-rate (rate | percent percentage | remainder) rate-limit;

You can also make the excess strict-high bandwidth available for other queues. You can split the excess bandwidth among multiple queues, but the total excess bandwidth assigned to these queues can only add up to 100 percent. The excess-bandwidth priority statement option is not supported on the Multiservices PIC. For more information about excess bandwidth sharing, see Configuring Excess Bandwidth Sharing on IQE PICs.

To share excess bandwidth among Multiservices PICs, include the excess-rate statement at the [edit class-of-service schedulers scheduler-name] hierarchy level.

[edit class-of-service schedulers scheduler-name]
excess-rate percent percentage;

Both of these rate-limiting and excess bandwidth sharing features apply to egress traffic only, and only for per-unit schedulers. Hierarchical schedulers and shared schedulers are not supported.

You must still complete the configuration by configuring the scheduler map and applying it to the Multiservices PIC interface.

Specify the scheduler name and parameter values.

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[edit]
user@host# edit class-of-service
user@host# set schedulers scheduler0 transmit-rate percent 10 rate-limit
user@host# set schedulers scheduler0 priority strict-high excess-rate percent 30
user@host# set schedulers scheduler1 transmit-rate percent 1 rate-limit
user@host# set schedulers scheduler1 priority high excess-rate percent 70

Specify a scheduler map name and associate it with the scheduler configuration and forwarding class.

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[edit class-of-service]
user@host# set scheduler-maps scheduler0 forwarding-class ef scheduler scheduler0
user@host# set scheduler-maps scheduler0 forwarding-class af scheduler scheduler1

Associate the scheduler map name with the interface.

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[edit class-of-service]
user@host# set interfaces lsq-1/3/0 unit 0 scheduler-map scheduler0
user@host# set interfaces lsq-1/3/0 unit 1 scheduler-map scheduler1

Verify the configuration.

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scheduler0 {
    transmit-rate {
        percent 10;
        rate-limit;
    }
    excess-rate percent 30;
    priority strict-high;
}
scheduler1 {
    transmit-rate {
        percent 1;
        rate-limit;
    }
    excess-rate percent 70;
    priority high;
}

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[edit class-of-service]
user@host# show schedulers

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interfaces {
 lsq-1/3/0 {
        unit 0 {
            scheduler-map scheduler0;
        }
    }

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scheduler-maps {
 scheduler0 {
        forwarding-class ef scheduler scheduler0;
        forwarding-class af scheduler scheduler1;
    }
}

arrow_backward PREVIOUS Allocating Excess Bandwidth Among Frame Relay DLCIs on Multiservices PICs

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Class of Service User Guide (Routers and EX9200 Switches)

Configuring Rate Limiting and Sharing of Excess Bandwidth on Multiservices PICs

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Class of Service User Guide (Routers and EX9200 Switches)

Configuring Rate Limiting and Sharing of Excess Bandwidth on Multiservices PICs

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