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Configuring QoS on the System
This chapter contains the following sections:
•
•
•
Information About System Classes
System Classes
The system qos is a type of MQC target. You use a service policy to associate a policy map with the system
qos target. A system qos policy applies to all interfaces on the switch unless a specific interface has an
overriding service-policy configuration. The system qos policies are used to define system classes, the classes
of traffic across the entire switch, and their attributes. To ensure QoS consistency (and for ease of configuration),
the device distributes the system class parameter values to all its attached network adapters using the Data
Center Bridging Exchange (DCBX) protocol.
If service policies are configured at the interface level, the interface-level policy always takes precedence
over system class configuration or defaults.
On the Cisco Nexus device, a system class is uniquely identified by a qos-group value. A total of six system
classes are supported. Two of the six system classes are defaults and are always present on the device. Up to
four additional system classes can be created by the administrator.
Default System Classes
The device provides the following system classes:
• Drop system class
OL-26657-01
Information About System Classes, page 35
Configuring System QoS, page 37
Verifying the System QoS Configuration, page 41
By default, the software classifies all unicast and multicast Ethernet traffic into the default drop system
class. This class is identified by qos-group 0.
Cisco Nexus 5000 NX-OS Quality of Service Configuration Guide, Release 5.1(3)N2(1)
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