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CHAPTER 20
Configuring Quality of Service
This chapter includes the following sections:
• Quality of Service, page 297
• Configuring System Classes, page 297
• Configuring Quality of Service Policies, page 301
• Configuring Flow Control Policies, page 304
Quality of Service
Cisco UCS provides the following methods to implement quality of service:
• System classes that specify the global configuration for certain types of traffic across the entire system
• QoS policies that assign system classes for individual vNICs
• Flow control policies that determine how uplink Ethernet ports handle pause frames
Configuring System Classes
System Classes
Cisco UCS uses Data Center Ethernet (DCE) to handle all traffic inside a Cisco UCS domain. This industry
standard enhancement to Ethernet divides the bandwidth of the Ethernet pipe into eight virtual lanes. Two
virtual lanes are reserved for internal system and management traffic. You can configure quality of service
for the other six virtual lanes. System classes determine how the DCE bandwidth in these six virtual lanes is
allocated across the entire Cisco UCS domain.
Each system class reserves a specific segment of the bandwidth for a specific type of traffic. This provides a
level of traffic management, even in an oversubscribed system. For example, you can configure the Fibre
Channel Priority system class to determine the percentage of DCE bandwidth allocated to FCoE traffic.
The following table describes the system classes that you can configure:
Cisco UCS Manager GUI Configuration Guide, Release 2.0
OL-25712-04 297