Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 3536

Complete Software Guide for Junos
Defining CoS Code-Point Aliases (CLI Procedure)
Related
Documentation
Defining CoS Classifiers (CLI Procedure)
3432
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OS for EX Series Ethernet Switches, Release 10.4
You can use code-point aliases to streamline the process of configuring CoS features on
your EX Series switch. 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.
You can configure code-point aliases for the following CoS marker types:
DSCP—Handles incoming IPv4 packets.
IEEE 802.1p—Handles Layer 2 CoS.
Inet precedence—Handles incoming IPv4 packets. IP precedence mapping requires
only the higher order three bits of the DSCP field.
To configure a code-point alias for a specified CoS marker type (
( my1 ) to the code-point ( 110001
[edit class-of-service code-point-aliases]
user@switch# set dscp my1 110001
Defining CoS Code-Point Aliases (J-Web Procedure) on page 3430
Example: Configuring CoS on EX Series Switches on page 3401
Monitoring CoS Value Aliases on page 3461
Understanding CoS Code-Point Aliases on page 3378
Packet classification associates incoming packets with a particular CoS servicing level.
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,
orIEEE 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
multifield classifiers, you set the forwarding class and loss priority of a packet based
on firewall filter rules.
The following example describes how to configure a BA classifier
default DSCP map and apply it to either a specific Gigabit Ethernet interface or to all the
Gigabit Ethernet interfaces on the switch. The BA classifier assigns loss priorities, as
shown in Table 452 on page 3433, to incoming packets in the four forwarding classes.
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), assign an alias
dscp
ba-classifier as the