616 Differentiated Services Commands
Differentiated Services Commands
This section describes the commands you use to configure QOS Differentiated
Services (DiffServ).
You configure DiffServ in several stages by specifying three DiffServ
components:
1. Class
❖ Creating and deleting classes.
❖ Defining match criteria for a class.
2. Policy
❖ Creating and deleting policies
❖ Associating classes with a policy
❖ Defining policy statements for a policy/class combination
3. Service
❖ Adding and removing a policy to/from an inbound interface
The DiffServ class defines the packet filtering criteria. The attributes of a
DiffServ policy define the way the switch processes packets. You can define
policy attributes on a per-class instance basis. The switch applies these attributes
when a match occurs.
Packet processing begins when the switch tests the match criteria for a packet.
The switch applies a policy to a packet when it finds a class match within that
policy.
The following rules apply when you create a DiffServ class:
◆ Each class can contain a maximum of one referenced (nested) class
◆ Class definitions do not support hierarchical service policies
A given class definition can contain a maximum of one reference to another
class. You can combine the reference with other match criteria. The referenced
class is truly a reference and not a copy since additions to a referenced class
affect all classes that reference it. Changes to any class definition currently
referenced by any other class must result in valid class definitions for all derived
classes, otherwise the switch rejects the change. You can remove a class
reference from a class definition.
The only way to remove an individual match criterion from an existing class
definition is to delete the class and re-create it.
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