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Configuring Behavior Aggregate Classifiers

date_range 29-Nov-23

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You can override the default IP precedence classifier (ipprec-compatibility) by defining a custom behavior aggregate (BA) classifier and applying it to a logical interface or by applying one of the other default BA classifiers to a logical interface.

The BA classifiers map sets the forwarding class and packet loss priority (PLP) for a specific set of code-point aliases or bit patterns. The inputs of the map are CoS values aliases or bit patterns. The outputs of the map are the forwarding class and the PLP. For more information about how CoS maps work, see Mapping CoS Component Inputs to Outputs.

The classifiers work as follows:

dscp—Handles incoming IPv4 packets.
dscp-ipv6—Handles incoming IPv6 packets.
exp—Handles MPLS packets using Layer 2 headers.
ieee-802.1—Handles Layer 2 CoS.
ieee-802.1ad—Handles IEEE 802.1ad formats (including DEI bit).
inet-precedence—Handles incoming IPv4 packets. IP precedence mapping requires only the upper three bits of the DSCP field.

A classifier takes a specified Cos value as either the literal bit pattern or as a defined alias and attempts to match it to the type of packet arriving on the interface. If the information in the packet’s header matches the specified pattern, the packet is sent to the appropriate queue, defined by the forwarding class associated with the classifier.

Note:

On M Series, MX Series, and T Series routers, and EX Series switches that do not have tricolor marking enabled, the loss priority can be configured only by setting the PLP within a multifield classifier. This setting can then be used by the appropriate drop profile map and rewrite rule. For more information, see Managing Congestion by Setting Packet Loss Priority for Different Traffic Flows.

Use the following configuration statements to define new classifiers for all CoS value types:

[edit class-of-service]
classifiers {
    (dscp | dscp-ipv6 | exp | ieee-802.1 | ieee-802.1ad | inet-precedence) classifier-name {
        import [classifier-name | default];
        forwarding-class class-name {
            loss-priority level code-points [ aliases ] [ bit-patterns ];
        }
    }
}

To define a new classifier for all CoS value types:

Specify the type and name of the new classifier. For example, to create a new DSCP type classifier called class1:
```
[edit]
user@host# edit class-of-service classifiers dscp class1
```

(Optional) Specify the forwarding class associated with the classifier.

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[edit class-of-service classifiers dscp class1]
user@host# edit forwarding-class class-name

(Optional) Specify the packet loss priority (PLP) value and for a specific set of code-point aliases and bit patterns.

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[edit class-of-service classifiers dscp class1 forwarding-class best-effort]
user@host# set loss-priority level code-points [ aliases ] [ bit-patterns]

When tricolor marking is enabled, four classifier PLP designations are supported: low, medium-low, medium-high, and high. For example, in the following configuration, the assured-forwarding forwarding class and medium-low PLP are assigned to all packets entering the interface with the 101110 CoS value:

Map the assured-forwarding forwarding class and medium-low PLP to the CoS value of 101110.

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[edit class-of-service classifiers dscp class1]
user@host# set forwarding-class assured forwarding loss-priority medium-low code-points 101110

Verify the configuration.
```
[edit class-of-service classifiers dscp class1]
user@host# show
```
```
forwarding-class assured-forwarding {
    loss-priority medium-low code-points 101110;
}
```
To use this classifier, you must configure the settings for the assured-forwarding forwarding class at the [edit class-of-service forwarding-classes queue queue-number assured-forwarding] hierarchy level. For more information, see Understanding How Forwarding Classes Assign Classes to Output Queues.

You can use any table, including the default, in the definition of a new classifier by including the import statement. The imported classifier is used as a template and is not modified. Whenever you commit a configuration that assigns a new class-name and loss-priority value to a CoS value alias or bit pattern, it replaces that entry in the imported classifier template. As a result, you must explicitly specify every CoS value in every designation that requires modification. For instance, to import the default DSCP classifier:

Specify the type and name of the new classifier. For example, to create a new DSCP type classifier called class1:
```
[edit]
user@host# edit class-of-service classifiers dscp class1
```

Specify the default DSCP classifier.

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[edit class-of-service classifiers dscp class1]
user@host# set import default

arrow_backward PREVIOUS Defining Aliases for CoS Value Bit Patterns

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Class of Service User Guide (Routers and EX9200 Switches)

Configuring Behavior Aggregate Classifiers

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Class of Service User Guide (Routers and EX9200 Switches)

Configuring Behavior Aggregate Classifiers

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