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Defining a traffic behavior
A traffic behavior is a set of QoS actions (such as traffic filtering, shaping, policing, and priority
marking) to take on a class of traffic.
The system pre-defines some traffic behaviors and defines general QoS actions for them. A
user-defined behavior cannot be named the same as a system-defined behavior. You can use these
behaviors when defining a policy. The system-defined behaviors are as follows:
•
ef
—Expedited forwarding.
•
af
—Assured forwarding.
•
be
—Best-effort.
•
be-flow-based
—Uses the weighted random early detection (WRED) drop policy.
To define a traffic behavior:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Create a traffic behavior and
enter traffic behavior view.
traffic behavior
behavior-name
N/A
3.
Configure actions in the
traffic behavior.
See the following parts in QoS configuration: traffic policing, traffic
filtering, traffic redirecting, priority marking, traffic accounting, and so
on.
Defining a policy
Configuring parent QoS policy
You associate a behavior with a class in a QoS policy to perform the actions defined in the
behavior for the class of packets.
The system provides a pre-defined QoS policy named
default
. It includes the associations
between predefined classes and predefined traffic behaviors:
{
Class
ef
with behavior
ef
.
{
Classes
af1
through
af4
with behavior
af
.
{
Class
default-class
with behavior
be
.
You cannot name a user-defined QoS policy the same as the system-defined QoS policy.
To associate a class with a behavior in a policy:
Step
Command
1.
Enter system view.
system-view
2.
Create a policy and enter policy view.
qos policy
policy-name
3.
Associate a class with a behavior in the policy.
classifier
classifier-name
behavior
behavior-name
NOTE:
On some devices, if the ACL contains deny rules, the if-match clause is ignored and the matching
process continues.
Configuring QoS policy nesting
You can reference a QoS policy in a traffic behavior to re-classify the traffic class associated with the
behavior and take action on the re-classified traffic as defined in the policy. The QoS policy
