Verifying The Priority Flow Control Configuration; Configuration Examples For Priority Flow Control - Cisco Nexus 9000 Series Configuration Manual

Verifying the Priority Flow Control Configuration

Command or Action
Step 6
queue-limit queue size [dynamic
dynamic threshold]

Verifying the Priority Flow Control Configuration

To display the PFC configuration, perform the following task:
Command
show interface priority-flow-control [module
number]

Configuration Examples for Priority Flow Control

The following example shows how to configure PFC:
configure terminal
interface ethernet 5/5
priority-flow-control mode on
The following example shows how to enable PFC on a traffic class:
switch(config)# class-map type qos c1
switch(config-cmap-qos)# match cos 3
switch(config-cmap-qos)# exit
switch(config)# policy-map type qos p1
switch(config-pmap-qos)# class type qos c1
switch(config-pmap-c-qos)# set qos-group 3
switch(config-pmap-c-qos)# exit
switch(config-pmap-qos)# exit
switch(config)# class-map type network-qos match-any c1
switch(config-cmap-nqos)# match qos-group 3
switch(config-cmap-nqos)# exit
switch(config)# policy-map type network-qos p1
switch(config-pmap-nqos)# class type network-qos c-nq1
switch(config-pmap-nqos-c)# pause buffer-size 20000 pause-threshold 100 resume-threshold
1000 pfc-cos 3
switch(config-pmap-nqos-c)# exit
switch(config-pmap-nqos)# exit
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x
148
Purpose
(Optional) Specifies either the static or dynamic shared limit available to the ingress
priority-group. The static queue limit defines the fixed size to which the
priority-group can grow. The dynamic queue limit allows the priority-group's
threshold size to be decided depending on the number of free cells available, in
terms of the alpha value.
Note Cisco Nexus 9200 Series switches only support a class level dynamic
threshold configuration with respect to the alpha value. This means that
all ports in a class share the same alpha value.
The queue limit for the X9636C-R and X9636Q-R line cards and the
Note
C9508-FM-R fabric module (in a Cisco Nexus 9508 switch) can be entered
as a percent or in bytes/kbytes/mbytes/gbytes. For example, queue-limit
percent 1 or queue-limit bytes 100.
Purpose
Displays the status of PFC on all interfaces or on
specific modules.
Configuring Priority Flow Control