Junos OS

Why is the answer A? Thanks in advanced

[edit class-of-service]

user@router# show

interfaces {

ge-0/0/2 {

unit 0 {

classifiers {

inet-precedence default;

}

}

}

}

A. behavior aggregate
B. policer
C. multifield
D. forwarding policy

The behavior aggregate (BA) classifier maps a class-of-service (CoS) value to a forwarding class and loss priority. The forwarding class determines the output queue.

Check more here:

https://www.juniper.net/documentation/en_US/junos12.3/topics/concept/classifier-ba-overview-cos-config-guide.html

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I read the url on the BA Classifier, however I am still not sure as based on the configuration shown in the initial post, how can we see which classifer it belongs to?

You don't have the complete configuration there for BA.

You need also to define the classifier. In your configuration, you should apply the classifier to ge-0/0/2.

A more complete configuration would be this:

[edit]
lab@vastar-re0# show class-of-service
classifiers {
    inet-precedence default {
        forwarding-class assured-forwarding {
            loss-priority low code-points [ 001 010 ];
        }
    }
}
interfaces {
    ge-0/0/2 {
        unit 0 {
            classifiers {
                inet-precedence default;
            }
        }
    }
}

[edit]
lab@vastar-re0#

This means that if a packet is coming from interface ge-0/0/2 and has the precedence 001 or 010, the it will be assigned to class assured-forwarding.

=====

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