Understanding Junos Os Cos Components For Ex Series Switches; Code-Point Aliases; Policers; Classifiers - Juniper JUNOS OS 10.3 - SOFTWARE Manual

Complete Software Guide for Junos

Understanding Junos OS CoS Components for EX Series Switches

Code-Point Aliases

Policers

Classifiers

3148
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OS for EX Series Ethernet Switches, Release 10.3
This topic describes the Juniper Networks Junos operating system (Junos OS)
class-of-service (CoS) components for Juniper Networks EX Series Ethernet Switches:
Code-Point Aliases on page 3148
Policers on page 3148
Classifiers on page 3148
Forwarding Classes on page 3149
Tail Drop Profiles on page 3149
Schedulers on page 3149
Rewrite Rules on page 3149
A code-point alias assigns a name to a pattern of code-point bits. You can use this name
instead of the bit pattern when you configure other CoS components such as classifiers,
drop-profile maps, and rewrite rules.
Policers limit traffic of a certain class to a specified bandwidth and burst size. Packets
exceeding the policer limits can be discarded. You define policers with filters that can be
associated with input interfaces.
For more information about policers, see "Understanding the Use of Policers in Firewall
Filters" on page 3036.
NOTE: You can configure policers to discard packets that exceed the rate
limits. If you want to configure CoS parameters such as
forwarding-class
Packet classification associates incoming packets with a particular CoS servicing level.
In Juniper Networks Junos operating system (Junos OS), classifiers associate packets
with a forwarding class and loss priority and assign packets to output queues based on
the associated forwarding class. Junos OS supports two general types of classifiers:
Behavior aggregate or CoS value traffic classifiers—Examines the CoS value in the
packet header. The value in this single field determines the CoS settings applied to the
packet. BA classifiers allow you to set the forwarding class and loss priority of a packet
based on the Differentiated Services code point (DSCP) value, IP precedence value,
and IEEE 802.1p value.
Multifield traffic classifiers—Examines multiple fields in the packet such as source and
destination addresses and source and destination port numbers of the packet. With
, you must use firewall filters.
and
loss-priority
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