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Configuring and Applying Custom MPLS EXP Classifiers to Routing Instances
Applying Global Classifiers and Wildcard Routing Instances
Applying Global MPLS EXP Classifiers to Routing Instances
Applying Classifiers by Using Wildcard Routing Instances
Verifying the Classifiers Associated with Routing Instances
Change History Table

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Applying MPLS EXP Classifiers to Routing Instances

date_range 14-Dec-23

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This topic shows how to apply MPLS EXP classifiers to routing instances.

When you enable VRF table labels and you do not explicitly apply a classifier configuration to the routing instance, the default MPLS EXP classifier is applied to the routing instance. For detailed information about VRF table labels, see the Junos OS VPNs Library for Routing Devices.

The default MPLS EXP classification table contents are shown in Table 1.

Table 1: Default MPLS EXP Classifier
MPLS EXP Bits	Forwarding Class	Loss Priority
`000`	`best-effort`	`low`
`001`	`best-effort`	`high`
`010`	`expedited-forwarding`	`low`
`011`	`expedited-forwarding`	`high`
`100`	`assured-forwarding`	`low`
`101`	`assured-forwarding`	`high`
`110`	`network-control`	`low`
`111`	`network-control`	`high`

Note:

At times you might need to maintain the original classifier—for example with bridge domains, where you neither want to configure a custom classifier for the routing instance nor accept the default classifier, which would override the original classifier. Starting with Junos OS Release 16.1, on MX Series devices only, you can maintain the original MPLS EXP classifier. To do so, apply the no-default option for the routing instance. For example:

[edit class-of-service]
routing-instances routing-instance-name {
    classifiers {
        no-default;
    }
}

Configuring and Applying Custom MPLS EXP Classifiers to Routing Instances

For routing instances with VRF table labels enabled, you can override the default MPLS EXP classifier and apply a custom classifier to a routing instance.

The following procedure requires that you navigate various levels in the configuration hierarchy. For information about navigating the CLI, see Using the CLI Editor in Configuration Mode in the Junos OS CLI User Guide.

To apply a custom classifier to a routing instance:

Filter traffic based on the IP header.

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[edit]
user@host# edit routing-instances routing-instance-name
user@host# set vrf-table-label

Configure the custom MPLS EXP classifier.

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[edit]
user@host# edit class-of-service 
user@host# set classifiers exp classifier-name import classifier-name forwarding-class class-name loss-priority level code-points [ aliases ] [ bit-patterns]
user@host# set forwarding-classes queue queue-number class-name priority (high | low)

Apply the custom MPLS EXP classifier to the routing instance..

[edit class-of-service routing-instances routing-instance-name classifiers]
user@host# set exp classifier-name;

Commit and confirm your configuration.
```
[edit]
user@host# show class-of-service routing-instances
```

Applying Global Classifiers and Wildcard Routing Instances

To apply a classifier to all routing instances:

Specify that the MPLS EXP classifier is for all routing instances.

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[edit class-of-service ]
user@host# set routing-instances all classifiers exp classifier-name

For routing instances associated with specific classifiers, the global configuration is ignored.

To use a wildcard to apply a classifier to all routing instances:

Include an asterisk (*) in the name of the routing instance.

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[edit]]
user@host# edit class-of-service routing-instances routing-instance-name*
user@host# set classifiers exp classifier-name

The wildcard configuration follows the longest match. If there is a specific configuration, it is given precedence over the wildcard configuration.

Note:

The wildcard * and the all keyword are supported at the [edit class-of-service routing-instances] hierarchy level but not at the [edit routing-instances] hierarchy level.

If you configure a routing instance at the [edit routing-instances] hierarchy level with, for example, the name vpn*, Junos OS treats vpn* as a valid and distinct routing instance name. If you then try to apply a classifier to the vpn* routing instance at the [edit class-of-service routing-instances] hierarchy level, the Junos OS treats the vpn* routing instance name as a wildcard, and all routing instances that start with vpn and do not have a specific classifier applied receive the classifier associated with vpn*.

This same behavior applies with the all keyword.

Note that the * wildcard must be appended to an instance name at these configuration levels. The * wildcard should not be intended as a stand-alone substitute for the all keyword.

Applying Global MPLS EXP Classifiers to Routing Instances

This example shows how to apply a global classifier to all routing instances and then override the global classifier for a specific routing instance. In this example, there are three routing instances: vpn1, vpn2, and vpn3, each with VRF table label enabled. The classifier exp-classifier-global is applied to vpn1 and vpn2 (that is, all but vpn3, which is listed separately). The classifier exp-classifier-3 is applied to vpn3.

To configure a global classifier for all routing instances and override the global classifier for a specific routing instance:

Enable the VRF table label for all three routing instances.

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[edit routing-instances]
user@host#  set vpn1 vrf-table-label
user@host#  set vpn2 vrf-table-label
user@host#  set vpn3 vrf-table-label

Apply the EXP classifier exp-classifier-global to all routing instances.

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[edit class-of-service routing-instances]
user@host# set all classifiers exp exp-classifier-global

Apply the EXP classifier exp-classifier-3 to only the routing-instance vpn3.

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[edit class-of-service routing-instances]
user@host# set vpn3 classifiers exp exp-classifier-3

Confirm your configuration.

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[edit routing-instances]
user@host# show

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vpn1 {
    vrf-table-label;
}
vpn2 {
    vrf-table-label;
}
vpn3 {
    vrf-table-label;
}

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[edit class-of-service routing-instances]
user@host# show

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all {
    classifiers {
        exp exp-classifier-global;
    }
}
vpn3 {
    classifiers {
        exp exp-classifier-3;
    }
}

Applying Classifiers by Using Wildcard Routing Instances

Configure a wildcard routing instance and override the wildcard with a specific routing instance. In this example, there are three routing instances: vpn-red, vpn-yellow, and vpn-green, each with VRF table label enabled. The classifier exp-class-wildcard is applied to vpn-yellow and vpn-green. The classifier exp-class-red is applied to vpn-red.

To configure a wildcard routing instance and override the wildcard with a specific routing instance:

Enable the VRF table label for all three routing instances.

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[edit routing-instances]
user@host#  set vpn-red vrf-table-label
user@host#  set vpn-yellow vrf-table-label
user@host#  set vpn-green vrf-table-label

Apply the EXP classifier exp-class-wildcard to all routing instances by using a wildcard.
```
[edit class-of-service routing-instances]
user@host# set vpn* classifiers exp exp-class-wildcard
```

Apply the EXP classifier exp-class-red to only the routing-instance vpn-red.

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[edit class-of-service routing-instances]
user@host# set vpn-red classifiers exp exp-class-red

Commit and confirm your configuration.

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[edit routing-instances]
user@host# show

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vpn-red {
    vrf-table-label;
}
vpn-yellow {
    vrf-table-label;
}
vpn-green {
    vrf-table-label;
}

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[edit class-of-service routing-instances]
user@host# show

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vpn* {
    classifiers {
        exp exp-class-wildcard;
    }
}
vpn-red {
    classifiers {
        exp exp-class-red;
    }
}

Verifying the Classifiers Associated with Routing Instances

Purpose
Action

Purpose

Display the MPLS EXP classifiers associated with two routing instances:

Action

To verify the MPLS EXP classifiers associated with two routing instances, enter the following Junos OS CLI operational mode command:

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user@host> show class-of-service routing-instances
  Routing Instance : vpn1
    Object            Name                   Type                    Index
    Classifier        exp-default            exp                         8
 
  Routing Instance : vpn2
    Object            Name                   Type                    Index
    Classifier        class2                 exp                     57507

Change History Table

Feature support is determined by the platform and release you are using. Use Feature Explorer to determine if a feature is supported on your platform.

Release

Description

16.1

Starting with Junos OS Release 16.1, on MX Series devices only, you can maintain the original MPLS EXP classifier.

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Applying MPLS EXP Classifiers to Routing Instances

Configuring and Applying Custom MPLS EXP Classifiers to Routing Instances

Applying Global Classifiers and Wildcard Routing Instances

Applying Global MPLS EXP Classifiers to Routing Instances

Applying Classifiers by Using Wildcard Routing Instances

Verifying the Classifiers Associated with Routing Instances

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Class of Service User Guide (Routers and EX9200 Switches)

ON THIS PAGE

Applying MPLS EXP Classifiers to Routing Instances

Configuring and Applying Custom MPLS EXP Classifiers to Routing Instances

Applying Global Classifiers and Wildcard Routing Instances

Applying Global MPLS EXP Classifiers to Routing Instances

Applying Classifiers by Using Wildcard Routing Instances

Verifying the Classifiers Associated with Routing Instances

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