Multifield Classifiers - Juniper JUNOS OS 10.3 - SOFTWARE Manual

Multifield Classifiers

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Copyright © 2010, Juniper Networks, Inc.
NOTE: On EX8200 switches, only one classifier of type DSCP and of type
IEEE 802.1p can be applied to an interface.
You can configure routed VLAN interfaces (RVIs) to classify packets. After you do this,
the User Priority (UP) bits in the incoming packets are rewritten according to the default
IEEE 802.1p rewrite rule, except on EX8200 switches. On EX8200 switches, you must
explicitly assign the default IEEE 802.1p rewrite rule to RVIs.
NOTE: By default, all BA classifiers classify traffic into either the best-effort
forwarding class or the network-control forwarding class.
Multifield classifiers examine multiple fields in a packet such as source and destination
addresses and source and destination port numbers of the packet. With MF classifiers,
you set the forwarding class and loss priority of a packet based on firewall filter rules.
MF classification is normally performed at the network edge because of the general lack
of DSCP or IP precedence support in end-user applications. On an edge switch, an MF
classifier provides the filtering functionality that scans through a variety of packet fields
to determine the forwarding class for a packet. Typically, a classifier performs matching
operations on the selected fields against a configured value.
Understanding Junos OS CoS Components for EX Series Switches on page 3148
Example: Configuring CoS on EX Series Switches on page 3173
Defining CoS Classifiers (CLI Procedure) on page 3204
Defining CoS Classifiers (J-Web Procedure) on page 3206
Chapter 107: Class of Service (CoS)—Overview
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