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{ "lLangCode": "en", "lName": "English", "lCountryCode": "us", "transcode": "en_US" }
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Configuring Queuing and Scheduling on Inline Services Interface

date_range 26-Jan-21

To configure queuing and scheduling on an inline services interface, you need to include scheduler-map statement at the [edit class-of-services interfaces si-/0/0/0] hierarchy level.

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[edit class-of-service]
scheduler-maps <scheduler-map-name>;
interfaces si-0/0/0; {
scheduler-map <scheduler-map-name>;
}

The queue-number 7 of the inline services interface has strict-high priority because the timing packets received by ACX Series routers gets assigned to this queue. You can explicitly override this strict-high priority by assigning an explicit scheduler for queue-number 7 in the scheduler-map statement attached to inline services interface as shown below:

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[edit class-of-service]
forwarding-classes {
    class <class-name> queue-number 7;
}
interfaces {
    si-0/0/0{
    scheduler-map scheduler-map-name;
    }
}
scheduler-maps {
    <map-name> {
    forwarding-class <class-name> scheduler <scheduler-name>;
    }
}
schedulers {
    <scheduler-name> {
    priority low ;
    }
}

The following are the CoS limitations for inline services:

  • Inline services packets classified with packet loss priority as medium-high in the ingress path are treated as high on the egress path.

  • When both timing and NAT services are enabled on the router, you should not classify NAT traffic into a forwarding class mapped with queue-number 7, because if you do so, the performance of timing services can degrade.

  • If a scheduler with queue-number 7 in the scheduler-map statement is attached to an inline services interface, then the scheduler should be configured with strict priority, else the timing performance can degrade.

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