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Quality of Service (QoS) Commands CP6923
CP6923 CLI Reference Manual Page 3 - 8
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.
3.2.1 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.
3.2.1.1 no diffserv
This command sets the DiffServ operational mode to inactive. While disabled, the DiffServ configuration is retained
and can be changed, but it is not activated. When enabled, DiffServ services are activated.
3.3 DiffServ Class Commands
Use the DiffServ class commands to define traffic classification. To classify traffic, you specify Behavior Aggregate
(BA), based on DSCP and Multi-Field (MF) classes of traffic (name, match criteria)
This set of commands consists of class creation/deletion and matching, with the class match commands specifying
Layer 3, Layer 2, and general match criteria. The class match criteria are also known as class rules, with a class
definition consisting of one or more rules to identify the traffic that belongs to the class.
The CLI command root is
class-map
.
Note: The mark possibilities for policing include CoS, IP DSCP, and IP Precedence. 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.
Format
diffserv
Mode Global Config
Format
no diffserv
Mode Global Config
Note: Once you create a class match criterion for a class, you cannot change or delete the criterion. To
change or delete a class match criterion, you must delete and re-create the entire class.