Cisco Nexus 5000 Series Switch CLI Software Configuration Guide, NX-OS 4.0(1a)N1 (OL-16597-01, January 2009)

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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 31 Configuring QoS
Configuring PFC and LLC
You can override the negotiation result by force-enabling the PFC capability. To force-enable the PFC
capability, perform this task:
Note Priority flow control is configured on the individual member interfaces of a port channel. The PFC
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:
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:
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
Command Purpose
Step 1
switch# configure terminal
Enters configuration mode.
Step 2
switch(config)# interface type slot/port
Specifies the interface to be changed.
Step 3
switch(config-if)# priority-flow-control
mode {auto|on}
Sets PFC mode for the selected interface.
Specify on to force-enable PFC.
Specify auto to negotiate PFC capability.
Command Purpose
switch(config-if)# no
priority-flow-control mode
Disables the PFC setting for the selected interface.
Command Purpose
Step 1
switch# configure terminal
Enters configuration mode.
Step 2
switch(config)# interface type slot/port
Specifies the interface to be changed.
Step 3
switch(config-if)# flowcontrol [receive
{on|off}] [transmit {on|off}]
Enables IEEE 802.3x link-level flow control for the
selected interface. Set receive and/or transmit on or
off.