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Defining Classifiers

Figure 40 shows the initial Quick Configuration page for defining classifiers, and Table 125 describes the related fields. Classifiers examine the CoS value or alias of an incoming packet and assign it a level of service by setting its forwarding class and loss priority. For more information about classifiers, see the JUNOS Class of Service Configuration Guide.

Figure 40: Classifiers Quick Configuration Page

Classifiers Quick Configuration
Page

Table 125: Classifiers Quick Configuration Page Summary

Field

Function

Your Action

Classifier Summary

DSCP

Allows you to define classifiers for DSCP IPv4 values.

To define a classifier for a DSCP code point value, click DSCP.

DSCP IPv6

Allows you to define classifiers for DSCP IPv6 values.

To define a classifier for a DSCP IPv6 value, click DSCP IPv6.

MPLS EXP

Allows you to define classifiers for MPLS experimental (EXP) bits.

To define a classifier for a set of MPLS EXP bits, click MPLS EXP.

IPv4 Precedence

Allows you to define classifiers for IPv4 precedence values.

To define a classifier for an IP precedence value, click IPv4 Precedence.

Classifier Name

Displays the names of classifiers.

Allows you to edit a specific classifier.

To edit a classifier, click its name.

Incoming Code Point (Alias)

Displays CoS values and aliases to which forwarding class and loss priority are mapped.

None.

Classify to Forwarding Class

Displays forwarding classes that are assigned to specific CoS values and aliases of a classifier.

None.

Classify to Loss Priority

Displays loss priorities that are assigned to specific CoS values and aliases of a classifier.

None.

Add

Opens a page that allows you to define classifiers.

To add a classifier, click Add.

Delete

Deletes a specified classifier.

To delete a classifier, locate the classifier, select the check box next to it, and click Delete.

Add a Classifier/Edit Classifier

Classifier Name

Specifies the name for a classifier.

To name a classifier, type the name—for example, ba-classifier.

Classifier Code Point Mapping

Sets the forwarding classes and the packet loss priorities (PLPs) for specific CoS values and aliases.

None.

Incoming Code Point

Specifies the CoS value in bits and the alias of a classifier for incoming packets.

To specify a CoS value and alias, either select preconfigured ones from the list or type new ones.

For information about forwarding classes and aliases assigned to well-known DSCPs, see the JUNOS Software Interfaces and Routing Configuration Guide.

Forwarding Class

Assigns the forwarding class to the specified CoS value and alias.

To assign a forwarding class, select either one of following default forwarding classes or one that you have configured:

  • best-effort—Provides no special CoS handling of packets. Typically, RED drop profile is aggressive and no loss priority is defined.
  • expedited-forwarding—Provides low loss, low delay, low jitter, assured bandwidth, and end-to-end service. Packets can be forwarded out of sequence or dropped.
  • assured-forwarding—Provides high assurance for packets within specified service profile. Excess packets are dropped.
  • network-control—Packets can be delayed but not dropped.

Loss Priority

Assigns a loss priority to the specified CoS value and alias.

To assign a loss priority, select one of the following:

  • low—Packet has a low loss priority.
  • high—Packet has a high loss priority.
  • medium-low—Packet has a medium-low loss priority.
  • medium-high–Packet has a medium-high loss priority.

Add

Assigns a forwarding class and loss priority to the specified CoS value and alias.

A classifier examines the incoming packet's header for the specified CoS value and alias and assigns it the forwarding class and loss priority that you have defined.

To assign a forwarding class and loss priority to a specific CoS value and alias, click Add.

Delete

Removes the forwarding class and loss priority assignment from the classifier.

To remove the forwarding class and loss priority assignment, select it and click Delete.


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