ON THIS PAGE
Example: Configure and Apply Custom BA Classifiers
This example shows how to configure BA classifiers for a device to determine forwarding treatment of packets.
Requirements
Before you begin, determine the default forwarding class and PLP for each well-known DSCP for which you want to configure for a BA classifier. See Default Behavior Aggregate Classification.
Overview
You configure BA classifiers to classify packets that contain valid DSCPs to appropriate queues.
Once configured, you must apply the BA classifier to the correct interfaces. You can
override the default IP precedence classifier by defining a classifier and applying
it to a logical interface. To define new classifiers for all code point types,
include the classifiers statement at the [edit
class-of-service] hierarchy level.
In this example, you set the DSCP BA classifier to ba-classifier as the default
DSCP map. You set:
-
A best-effort forwarding class as
be-class -
An expedited forwarding class as
ef-class -
An assured forwarding class as
af-class -
A network control forwarding class as
nc-class
Finally, you apply the BA classifier to an interface called ge-0/0/0.
Table 1 shows how the behavior aggregate classifier assigns loss priorities to incoming packets in the four forwarding classes.
ba-classifier Forwarding Class |
For CoS Traffic Type |
ba-classifier Assignments |
|---|---|---|
|
Best-effort traffic |
High-priority code point: |
|
Expedited forwarding traffic |
High-priority code point: |
|
Assured forwarding traffic |
High-priority code point: |
|
Network control traffic |
High-priority code point: |
Configuration
Procedure
CLI Quick Configuration
To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the commands into the CLI at the [edit] hierarchy level, and then enter commit from the configuration mode.
set class-of-service classifiers dscp ba-classifier import default set class-of-service classifiers dscp ba-classifier forwarding-class be-class loss-priority high code-points 000001 set class-of-service classifiers dscp ba-classifier forwarding-class ef-class loss-priority high code-points 101111 set class-of-service classifiers dscp ba-classifier forwarding-class af-class loss-priority high code-points 001100 set class-of-service classifiers dscp ba-classifier forwarding-class nc-class loss-priority high code-points 110001 set class-of-service interfaces ge-0/0/0 unit 0 classifiers dscp ba-classifier
Step-by-Step Procedure
The following example requires you to navigate various levels in the configuration hierarchy. For instructions on how to do that, see Using the CLI Editor in Configuration Mode in the CLI User Guide.
To configure behavior aggregate classifiers for a device:
Configure the class of service.
[edit] user@host# edit class-of-service
Configure behavior aggregate classifiers for DiffServ CoS.
[edit class-of-service] user@host# edit classifiers dscp ba-classifier user@host# set import default
Configure a best-effort forwarding class classifier.
[edit class-of-service classifiers dscp ba-classifier] user@host# set forwarding-class be-class loss-priority high code-points 000001
Configure an expedited forwarding class classifier.
[edit class-of-service classifiers dscp ba-classifier] user@host# set forwarding-class ef-class loss-priority high code-points 101111
Configure an assured forwarding class classifier.
[edit class-of-service classifiers dscp ba-classifier] user@host# set forwarding-class af-class loss-priority high code-points 001100
Configure a network control forwarding class classifier.
[edit class-of-service classifiers dscp ba-classifier] user@host# set forwarding-class nc-class loss-priority high code-points 110001
Apply the behavior aggregate classifier to an interface.
[edit] user@host# set class-of-service interfaces ge-0/0/0 unit 0 classifiers dscp ba-classifier
Note:You can use interface wildcards for
interface-nameandlogical-unit-number.
Results
From configuration mode, confirm your configuration by entering the show class-of-service command. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.
[edit]
user@host# show class-of-service
classifiers {
dscp ba-classifier {
import default;
forwarding-class be-class {
loss-priority high code-points 000001;
}
forwarding-class ef-class {
loss-priority high code-points 101111;
}
forwarding-class af-class {
loss-priority high code-points 001100;
}
forwarding-class nc-class {
loss-priority high code-points 110001;
}
}
interfaces {
ge-0/0/0 {
unit 0 {
classifiers {
dscp ba-classifier;
}
}
}
If you are done configuring the device, enter commit from configuration mode.
Verification
Confirm that the configuration is working properly.
Verify the DSCP Classifier
Purpose
Make sure that the DSCP classifier is configured as expected.
Action
Run the show class-of-service classifiers name ba-classifier command.
user@host> show class-of-service classifiers name ba-classifier Classifier: ba-classifier, Code point type: dscp, Index: 10755 Code point Forwarding class Loss priority 000000 best-effort low 000001 be-class high 000010 best-effort low 000011 best-effort low 000100 best-effort low 000101 best-effort low 000110 best-effort low 000111 best-effort low 001000 best-effort low 001001 best-effort low 001010 assured-forwarding low 001011 best-effort low 001100 af-class high 001101 best-effort low 001110 assured-forwarding high 001111 best-effort low 010000 best-effort low 010001 best-effort low 010010 best-effort low 010011 best-effort low 010100 best-effort low 010101 best-effort low 010110 best-effort low 010111 best-effort low 011000 best-effort low 011001 best-effort low 011010 best-effort low 011011 best-effort low 011100 best-effort low 011101 best-effort low 011110 best-effort low 011111 best-effort low 100000 best-effort low 100001 best-effort low 100010 best-effort low 100011 best-effort low 100100 best-effort low 100101 best-effort low 100110 best-effort low 100111 best-effort low 101000 best-effort low 101001 best-effort low 101010 best-effort low 101011 best-effort low 101100 best-effort low 101101 best-effort low 101110 expedited-forwarding low 101111 ef-class high 110000 network-control low 110001 nc-class high 110010 best-effort low 110011 best-effort low 110100 best-effort low 110101 best-effort low 110110 best-effort low 110111 best-effort low 111000 network-control low 111001 best-effort low 111010 best-effort low 111011 best-effort low 111100 best-effort low 111101 best-effort low 111110 best-effort low 111111 best-effort low
Meaning
Notice that the default classifier is incorporated into the customer classifier. If you were to remove the import default statement from the custom classifier, the custom classifier would look like this:
user@host> show class-of-service classifier name ba-classifier Classifier: ba-classifier, Code point type: dscp, Index: 10755 Code point Forwarding class Loss priority 000001 be-class high 001100 af-class high 101111 ef-class high 110001 nc-class high
Verify That the Classifier Is Applied to the Interfaces
Purpose
Make sure that the classifier is applied to the correct interfaces.
Action
Run the show class-of-service interface command.
user@host> show class-of-service interface ge-0/0/0 Physical interface: ge-0/0/0, Index: 144 Queues supported: 8, Queues in use: 4 Scheduler map: <default>, Index: 2 Congestion-notification: Disabled Logical interface: ge-0/0/0.0, Index: 333 Object Name Type Index Classifier ba-classifier dscp 10755
Meaning
The interface is configured as expected.