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Classifiers

Packet classification refers to the examination of an incoming packet. This function associates the packet with a particular CoS servicing level. Two general types of classifiers are supported—behavior aggregate (BA) classifiers and multifield (MF) classifiers. When both BA and and MF classifications are performed on a packet, the MF classification has higher precedence.

In JUNOS software, classifiers associate incoming packets with a forwarding class (FC) and packet loss priority (PLP) and, based on the associated forwarding class, assign packets to output queues. FC and PLP associated with a packet specify the behavior of a hop, within the system, to process the packet. The per hop behavior (PHB) comprises packet forwarding, policing, scheduling, shaping, and marking. For example, a hop can put a packet in one of the priority queues according to its FC and then manage the queues by checking a packet's PLP. JUNOS software supports up to eight FCs and four PLPs.

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