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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 Assign to Interface option allows 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.

To assign interfaces using the J-Web configuration editor:

  1. Select Configure>Class of Service>Assign to Interface.

    The Configure Interface Association summary page appears. The summary page displays the interfaces available for CoS component assignment and the status of existing CoS components.

  2. Fill in the options as shown in Table 131.
  3. To apply the configuration and return to the main configuration page, click OK.
  4. To cancel your entries and return to the main page, click Cancel.

Table 131: Assigning CoS Components to Interfaces

Field

Function

Action

Configure Interface Association

Port

Displays the port and interface name.

None

Scheduler Map

Displays predefined scheduler maps 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.

None

Edit

Opens an edit page that allows you to associate the system default scheduler map or a preconfigured map to the selected interface.

To change a map for an interface, select it from the Scheduler Map list and click Edit.

Details of Logical Interfaces

Unit

None

Forwarding class

Displays the forwarding classes assigned to a particular interface.

None

Scheduler map

Displays the scheduler maps assigned to a particular interface.

None

Virtual channel group

Displays the virtual channel groups assigned to a particular interface.

None

Classifier

Displays the classifers assigned to a particular interface—for example, information about DSCP, DSCPv6, EXP, and inet classifiers.

None

Rewrite rule

Displays the rewrite rules assigned to a particular interface—for example, information about DSCP, DSCPv6, EXP and inet rewrite rules.

None

Add

Opens a page that allows you to add a CoS service to a physical interface.

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

Edit

Opens a page that allows you to edit a CoS services assigned to an interface.

To edit an existing service, select the service in the summary page and click Edit.

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 Logical Interface/Edit Logical Interface

Unit

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 Unit 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 from the list.

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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