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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 1 Configuring QoS
Configuring System Classes
The following example enables link-level flow control frames on an interface:
switch# configure terminal
switch(config)# interface ethernet 1/2
switch(config-if)# flowcontrol receive on transmit on
To disable link-level flow control, perform this task:
Configuring System Classes
This section describes how to configure system classes on the switch. The steps to configure a system
class are described in the following topics:
• Configuring Class Maps, page 1-9
• Configuring Policy Maps, page 1-10
• Creating the System Service Policy, page 1-11
• System Class Example, page 1-12
• Enabling Jumbo MTU, page 1-12
• Verifying Jumbo MTU, page 1-12
Configuring Class Maps
The class-map command creates a named object that represents a class of traffic. In the class map, you
specify a set of match criteria for classifying the packets. For system classes, the only match criteria
supported is match cos.
If a system class is configured with no-drop function, the match cos command serves an additional
purpose. The switch sends the CoS value to the adapter, so that the adapter will apply PFC Pause for this
CoS value.
The FCoE system class has a default CoS value of 3. You can add a match cos configuration to the FCoE
system class to set a different CoS value. PFC Pause will be applied to traffic that matches the new value.
Command Purpose
switch(config-if)# no flowcontrol [receive
{on|off}] [transmit {on|off}]
Disables 802.3x link-level flow control for the
selected interface.
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