Default Settings For Priority Flow Control; Configuring Priority Flow Control - Cisco Nexus 7000 Series Configuration Manual

Configuring Priority Flow Control

PFC and F1 Series Module Ports
• When PFC is enabled on a port, precision time protocol (PTP) is not supported on the port.
• The pong utility is not supported on a VDC when PFC is enabled on any of the ports in the same VDC.
• PFC is not supported when PTP is enabled on the same port or when the pong utility is enabled in the

Default Settings for Priority Flow Control

Table 41: Default PFC Settings
Parameter
PFC
Configuring Priority Flow Control
You can configure PFC on a per-port basis to enable the no-drop behavior for the CoS as defined by the active
network qos policy. PFC can be configured in one of these three modes:
• auto—Enables the no-drop CoS values to be advertised by the DCBXP and negotiated with the peer. A
• on—Enables PFC on the local port regardless of the capability of the peers.
• off—Disables PFC on the local port.
Note You can also enable Link-level Flow Control (LFC) on the same port in which PFC is enabled. However,
PFC, if enabled, always gets the priority.
Procedure
Step 1
Step 2
Step 3
Step 4
same VDC.
successful negotiation enables PFC on the no-drop CoS. Any failures because of a mismatch in the
capability of peers causes the PFC not to be enabled.
Command or Action
switch# configure terminal
switch(config)# interface ethernet
[slot/port-number]
switch(config-if)# priority-flow-control mode
{auto | off | on}
(Optional) switch(config-if)# show interface
priority-flow-control
Default
Auto
Purpose
Enters global configuration mode.
Enters interface mode on the interface specified.
Sets the PFC to the auto, off, or on mode. By
default, PFC mode is set to auto on all ports.
Displays the status of PFC on all interfaces.
Cisco Nexus 7000 Series NX-OS Quality of Service Configuration Guide
Default Settings for Priority Flow Control
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