Multifield Classification; Multifield Classification Overview; Forwarding Classes And Plp Levels; Multifield Classification And Ba Classification - Juniper EX9200 Features Manual

CHAPTER 11

Multifield Classification

Multifield Classification Overview

Forwarding Classes and PLP Levels

Multifield Classification and BA Classification

Copyright © 2016, Juniper Networks, Inc.
Multifield Classification Overview on page 115
Multifield Classification Requirements and Restrictions on page 118
Multifield Classification Limitations on M Series Routers on page 119
Example: Configuring Multifield Classification on page 121
Example: Configuring and Applying a Firewall Filter for a Multifield Classifier on page 127
This topic covers the following information:
Forwarding Classes and PLP Levels on page 115
Multifield Classification and BA Classification on page 115
Multifield Classification Used In Conjunction with Policers on page 116
You can configure the Junos OS class of service (CoS) features to classify incoming traffic
by associating each packet with a forwarding class, a packet loss priority (PLP) level, or
both:
Based on the associated forwarding class, each packet is assigned to an output queue,
and the router services the output queues according to the associated scheduling you
configure.
Based on the associated PLP, each packet carries a lower or higher likelihood of being
dropped if congestion occurs. The CoS random early detection (RED) process uses
the drop probability configuration, output queue fullness percentage, and packet PLP
to drop packet as needed to control congestion at the output stage.
The Junos OS supports two general types of packet classification: behavior aggregate
(BA) classification and multifield classification:
BA classification, or CoS value traffic classification, refers to a method of packet
classification that uses a CoS configuration to set the forwarding class or PLP of a
packet based on the CoS value in the IP packet header. The CoS value examined for
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