Kontron AT8904 CLI - Manual (Page 175)

AT8904M Quality of Service (QoS) Commands
Page 4 - 7 AT8904M CLI Reference Manual
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.
NOTE: The mark possibilities for policing include CoS, IP DSCP, and IP Pre-
cedence. While the latter two are only meaningful for IP packet types,
CoS marking is allowed for both IP and non-IP packets, since it
updates the 802.1p user priority field contained in the VLAN tag of the
layer 2 packet header.
NOTE: Traffic to be processed by the DiffServ feature requires an IP header.
4.2.1 diffserv
This command sets the DiffServ operational mode to active. While disabled, the
DiffServ configuration is retained and can be changed, but it is not activated. When
enabled, Diffserv services are activated.
Format
diffserv
Mode Global Config