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Setting the PLP with a BA Classifier

Behavior aggregate (BA) classifiers take action on incoming packets. When TCM is enabled, T-series and M320 platforms support four classifier PLP designations: low, medium-low, medium-high, and high. To configure the PLP for a classifier, include the following statements at the [edit class-of-service] hierarchy level:



[edit class-of-service]

classifiers {


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

import (classifier-name | default);



forwarding-class class-name {



loss-priority (low | medium-low | medium-high
| high) {

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


}


}


}

The inputs for a classifier are the CoS values. The outputs for a classifier are the forwarding class and the loss priority (PLP). A classifier sets the forwarding class and the PLP for each packet entering the interface with a specific set of CoS values.

For example, in the following configuration, the assured-forwarding forwarding class and medium-low PLP are assigned to all packets entering the interface with the 101110 CoS values:



class-of-service {



classifiers {


dscp dscp-cl {



forwarding-class assured-forwarding {



loss-priority medium-low {

code-points 101110;
}


}


}


}


}

To use this classifier, you must configure the settings for the assured-forwarding forwarding class at the [edit class-of-service forwarding-classes queue queue-number assured-forwarding] hierarchy level. For more information, see Configuring Forwarding Classes.

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