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Setting the PLP with a Multifield Classifier

Multifield classifiers take action on incoming or outgoing packets, depending whether the firewall rule is applied as an input filter or an output filter. When TCM is enabled, T-series and M320 platforms support four multifield classifier PLP designations: low, medium-low, medium-high, and high.

To configure the PLP for a multifield classifier, include the loss-priority statement in a policer or firewall filter that you configure at the at the [edit firewall] hierarchy level:



[edit firewall]
family family-name {


filter filter-name {


term term-name {


from {

match-conditions;
}




then {
loss-priority (low | medium-low | medium-high | high);
forwarding-class class-name;
}


}


}


}

The inputs (match conditions) for a multifield classifier are one or more of the six packet header fields: destination address, source address, IP protocol, source port, destination port, and DSCP. The outputs for a multifield classifier are the forwarding class and the loss priority (PLP). In other words, a multifield classifier sets the forwarding class and the PLP for each packet entering or exiting the interface with a specific destination address, source address, IP protocol, source port, destination port, or DSCP.

For example, in the following configuration, the forwarding class expedited-forwarding and PLP medium-high are assigned to all IPv4 packets with the 10.1.1.0/24 or 10.1.2.0/24 source address:



firewall {


family inet {


filter classify-customers {


term isp1-customers {


from {
source-address 10.1.1.0/24;
source-address 10.1.2.0/24;
}




then {
loss-priority medium-high;
forwarding-class expedited-forwarding;
}


}


}


}


}

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

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