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Configuring and Applying Behavior Aggregate Classifiers

You configure behavior aggregate classifiers to classify packets that contain valid DSCPs to appropriate queues. Once configured, you must apply the behavior aggregate classifier to the correct interfaces.

The following example shows how to configure the DSCP behavior aggregate classifier ba-classifier as the default DSCP map, and apply it to the device's Gigabit Ethernet interface ge-0/0/0. The behavior aggregate classifier assigns loss priorities, as shown in Table 199, to incoming packets in the four forwarding classes.

Table 199: Sample ba-classifier Loss Priority Assignments

mf-classifier Forwarding Class

For CoS Traffic Type

ba-classifier Assignments

be-class

Best-effort traffic

High-priority code point: 000001

ef-class

Expedited forwarding traffic

High-priority code point: 101111

af-class

Assured forwarding traffic

High-priority code point: 001100

nc-class

Network control traffic

High-priority code point: 110001

To configure and apply behavior aggregate classifiers for the device:

  1. Navigate to the top of the configuration hierarchy in either the J-Web or CLI configuration editor.
  2. Perform the configuration tasks described in Table 200.
  3. Go on to Configuring RED Drop Profiles for Congestion Control .

Table 200: Configuring and Applying Behavior Aggregate Classifiers

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the Class of service level in the configuration hierarchy.
  1. In the J-Web interface, select Configuration>View and Edit>Edit Configuration.
  2. Next to Class of service, click Configure or Edit.

From the [edit] hierarchy level, enter

edit class-of-service

Configure behavior aggregate classifiers for DiffServ CoS.
  1. Click Configure next to Classifiers.
  2. Click Add new entry next to Dscp.
  3. In the Name box, type the name of the behavior aggregate classifier—for example, ba-classifier.
  4. In the Import box, type the name of the default DSCP map, default.

Enter

edit classifiers dscp ba-classifier

set import default

Configure a best-effort forwarding class classifier.
  1. Click Add new entry next to Forwarding class.
  2. In the Class name box, type the name of the previously configured best-effort forwarding class—be-class.
  3. Click Add new entry next to Loss priority.
  4. From the Loss val list, select high.
  5. Click Add new entry next to Code points.
  6. In the Value box, type the value of the high-priority code point for best-effort traffic—for example, 00001.
  7. Click OK three times.

Enter

set forwarding-class be-class loss-priority high code-points 000001

Configure an expedited forwarding class classifier.
  1. Click Add new entry next to Forwarding class.
  2. In the Class name box, type the name of the previously configured expedited forwarding class—ef-class.
  3. Click Add new entry next to Loss priority.
  4. From the Loss val list, select high.
  5. Click Add new entry next to Code points.
  6. In the Value box, type the value of the high-priority code point for expedited forwarding traffic—for example, 101111.
  7. Click OK three times.

Enter

set forwarding-class ef-class loss-priority high code-points 101111

Configure an assured forwarding class classifier.
  1. Click Add new entry next to Forwarding class.
  2. In the Class name box, type the name of the previously configured assured forwarding class—af-class.
  3. Click Add new entry next to Loss priority.
  4. From the Loss val list, select high.
  5. Click Add new entry next to Code points.
  6. In the Value box, type the value of the high-priority code point for assured forwarding traffic—for example, 001100.
  7. Click OK three times.

Enter

set forwarding-class af-class loss-priority high code-points 001100

Configure a network control class classifier.
  1. Click Add new entry next to Forwarding class.
  2. In the Class name box, type the name of the previously configured network control forwarding class—nc-class.
  3. Click Add new entry next to Loss priority.
  4. From the Loss val list, select high.
  5. Click Add new entry next to Code points.
  6. In the Value box, type the value of the high-priority code point for network control traffic—for example, 110001.
  7. Click OK five times.

Enter

set forwarding-class nc-class loss-priority high code-points 110001

Apply the behavior aggregate classifier to an interface.

(See the interface naming conventions in Network Interface Naming.)
  1. Click Add new entry next to Interfaces.
  2. In the Interface name box, type the name of the interface—for example, ge-0/0/0.
  3. Click Add new entry next to Unit.
  4. In the Unit number box, type the logical interface unit number—0.
  5. Click Configure next to Classifiers.
  6. In the Classifiers box, under Dscp, type the name of the previously configured behavior aggregate classifier—ba-classifier.
  7. Click OK.

From the [edit class of service] hierarchy level, enter

set interfaces ge-0/0/0 unit 0 classifiers dscp ba-classifier

Example: Defining Aliases for Bits

When you configure classes and define classifiers, you can refer to the markers by alias names. You can configure user-defined classifiers in terms of alias names. If the value of an alias changes, it alters the behavior of any classifier that references it.

To define a code-point alias on an SRX-series device, include the code-point-aliases statement at the [edit class-of-service] hierarchy level:

[edit class-of-service]
code-point-aliases {
(dscp |exp | ieee-802.1 | inet-precedence) {
alias-name bits;
}
}

The CoS marker types are as follows:

For example, you can set up the following configuration:

[edit class-of-service]
code-point-aliases {
dscp {
my1 110001;
my2 101110;
be 000001;
cs7 110000;
}
}

The sample configuration produces this mapping:


user@host>show class-of-service code-point-aliases dscp 
Alias 	Bit pattern
ef/my2 	101110
af11 		001010
af12 		001100
af13 		001110
af21 		010010
af22 		010100
af23 		010110
af31 		011010
af32 		011100
af33 		011110
af41 		100010
af42 		100100
af43 		100110
be 		000001
cs1 		001000
cs2 		010000
cs3 		011000
cs4 		100000
cs5 		101000
nc1/cs6/cs7 110000
nc2 		111000
my1 		110001

The following notes explain certain results in the mapping:

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