Cisco nexus 5000 series Cli Configuration Manual page 406

Configuring PFC and LLC
S e n d f e e d b a c k t o n x 5 0 0 0 - d o c f e e d b a c k @ c i s c o . c o m
Configuring Priority Flow Control
By default, Ethernet interfaces negotiate PFC capability with the network adapter using DCBX protocol.
When PFC is enabled, PFC is applied to traffic that matches the CoS value configured for the no-drop
Ethernet class.
You can override the negotiation result by force-enabling the PFC capability. To force-enable the PFC
capability, perform this task:
Command
Step 1
switch# configure terminal
Step 2
switch(config)# interface type slot/port
Step 3
switch(config-if)# priority-flow-control
mode {auto|on}
Priority flow control is configured on the individual member interfaces of a port channel. The PFC
Note
configuration must be consistent across all members of the port channel for the port channel to become
operational.
The following example shows how to force-enable PFC on an interface:
switch# configure terminal
switch(config)# interface ethernet 1/2
switch(config-if)# priority-flow-control mode on
To disable PFC capability for an interface, perform this task:
Command
switch(config-if)# no priority-flow-control
mode
Configuring IEEE 802.3x Link-Level Flow Control
By default, link-level flow control capability on Ethernet interfaces is disabled. You can enable link-level
flow-control capability for the transmit and receive directions. To enable link-level flow control
capability, perform this task:
Command
Step 1
switch# configure terminal
Step 2
switch(config)# interface type slot/port
Step 3
switch(config-if)# flowcontrol [receive
{on|off}] [transmit {on|off}]
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
1-8
Purpose
Enters configuration mode.
Specifies the interface to be changed.
Sets PFC mode for the selected interface.
Specify on to force-enable PFC.
Specify auto to negotiate PFC capability.
Purpose
Disables the PFC setting for the selected
interface.
Purpose
Enters configuration mode.
Specifies the interface to be changed.
Enables IEEE 802.3x link-level flow control for the
selected interface. Set receive and/or transmit on or
off.
Chapter 1 Configuring QoS
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