Configuring Qos - Cisco Nexus 5000 Series Configuration Manual

Configuring QoS

This chapter describes how to configure quality of service (QoS) on Cisco Nexus 5000 Series switches. It
contains the following sections:
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Information About QoS
The configurable Cisco NX-OS QoS features on the Cisco Nexus 5000 Series switch allow you to classify
the network traffic, prioritize the traffic flow, and provide congestion avoidance.
The default QoS configuration on the switch provides lossless service for Fibre Channel and Fibre Channel
Over Ethernet (FCoE) traffic and best-effort service for Ethernet traffic. QoS can be configured to provide
additional classes of service for Ethernet traffic. Cisco Nexus 5000 Series QoS features are configured using
Cisco Modular QoS CLI (MQC).
The FCoE QoS must be configured either if native FC or FCoE or FC and FCoE are in use. The FCoE QoS
must be added even if Ethernet is not configured on the switch.
The following commands will enable the default QoS configuration:
switch(config)# system qos
switch(config-sys-qos)# service-policy type queuing input fcoe-default-in-policy
switch(config-sys-qos)# service-policy type queuing output fcoe-default-out-policy
OL-20921-01
Information About QoS, page 5
QoS Configuration Guidelines and Limitations, page 14
Configuring System Classes, page 15
Configuring QoS on Interfaces, page 36
Configuring No-Drop Buffer Thresholds, page 40
Configuring the Buffer Threshold for the Cisco Nexus 2148T Fabric Extender, page 41
Configuring Priority Flow Control and Link-Level Flow Control, page 42
Enabling Virtual Output Queuing Limits for Unicast Traffic on the Cisco Nexus 5548 Switch, page
44
Verifying QoS Configuration, page 45
Example QoS Configurations, page 51
C H A P T E R
Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide
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