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Assigning CoS Components to Interfaces

Note: SRX Series devices do not support WAN interfaces (including T1/E1 and channelized T1/E1.

After you have defined CoS components, you must assign them to logical or physical interfaces. The CoS Quick Configuration pages allow you to assign scheduler maps to physical or logical interfaces and to assign forwarding classes, classifiers, rewrite rules, or virtual channel groups to logical interfaces.

Figure 33 shows the initial Quick Configuration page for assigning CoS components to interfaces. The page displays the interfaces available for CoS component assignment and the status of existing CoS components.

Figure 33: Assignment of CoS Components to Interfaces Quick Configuration Page

Assignment
of CoS Components to Interfaces Quick Configuration Page

To assign CoS components to interfaces with Quick Configuration:

  1. In the J-Web interface, select Configure>Class of Service>Classifiers.
  2. Enter information into these Quick Configuration pages, as described in Table 128.
  3. Click one of the following buttons after completing configuration on any Quick Configuration main page:
  4. To verify the CoS configuration, see the JUNOS Enhanced Services Interfaces and Routing Configuration Guide.

Table 128: Assigning CoS Components to Interfaces Quick Configuration Summary

Field

Function

Your Action

Class of Service Interfaces

Interface Name

(See the interface naming conventions in the JUNOS Software Interfaces and Routing Configuration Guide.)

Lists the names of physical and logical interfaces configured on the system.

Allows you to edit CoS component assignments to physical and logical interfaces.

To edit an interface's CoS assignments, click the interface.

Class of Service Overview

Displays the CoS components assigned to a particular interface—for example, information about DSCP classifiers, EXP classifiers, or DSCP rewrite rules.

None.

Add

Allows you to add a CoS service to a physical interface.

To add a CoS service to a physical interface, click Add.

Delete

Removes CoS services assigned to a specific interface.

To remove CoS services assigned to a specific interface, locate the interface name, click the check box next to it, and click Delete.

Add CoS Service to a Physical Interface/Edit CoS Physical Interface

Physical Interface Name

Specifies the name of a physical interface.

Allows you to assign CoS components to a set of interfaces at the same time.

To specify an interface for CoS assignment, type its name in the Physical Interface Name box.

To specify a set of interfaces for CoS assignment, use the wildcard character (*)—for example, ge-0/*/0.

Scheduler Map

Specifies a predefined scheduler map for the physical interface.

A scheduler map enables the physical interface to have more than one set of output queues.

Note: For 4-port Fast Ethernet ePIMs, if you apply a CoS scheduler map on outgoing (egress) traffic, the device does not divide the bandwidth appropriately among the CoS queues. As a workaround, configure enforced CoS shaping on the ports.

To specify a map for an interface, select it from the Scheduler Map list.

Add

Allows you to add a CoS service to a logical interface on a specified physical interface.

To add a CoS Service to a logical interface, click Add.

Add CoS Service to a Logical Interface Unit/Edit CoS Logical Interface Unit

Logical Interface Unit Name

Specifies the name of a logical interface.

Allows you to assign CoS components to all logical interfaces configured on a physical interface at the same time.

To specify an interface for CoS assignment, type its name in the Logical Interface Unit Name box.

To assign CoS services to all logical interfaces configured on this physical interface, type the wildcard character (*).

Scheduler Map

Specifies a predefined scheduler map for this interface.

Note: You can configure either a scheduler map or a virtual channel group on a logical interface, not both.

To assign a scheduler map to the interface, select it from the list.

Forwarding Class

Assigns a predefined forwarding class to incoming packets on a logical interface.

To assign a forwarding class to the interface, select it.

Virtual Channel Group

Applies a virtual channel group to a logical interface.

Applying a virtual channel group creates a set of eight queues for each virtual channel in the group.

Note: You can configure either a scheduler map or a virtual channel group on a logical interface, not both.

To specify a virtual channel group for the interface, select it from the list.

Classifiers

Allows you to apply classification maps to a logical interface.

Classifiers assign a forwarding class and loss priority to an incoming packet based on its CoS value.

To assign a classification map to the interface, select an appropriate classifier for each CoS value type used on the interface.

Rewrite Rules

Allows you to apply rewrite rule configurations to a logical interface.

Rewrite rules rewrite the CoS values in an outgoing packet based on forwarding class and loss priority.

You can choose to apply your own rewrite rule or a default one. The default rewrite assignments are based on the default bit definitions of DSCP, DSCP IPv6, MPLS EXP, and IP precedence.

To apply a rewrite rule configuration to the interface, select a rule for each CoS value type used on the interface.


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