Priority Flow Control (PFC) is an IEEE standard (802.1qbb) for link level flow control on Ethernet networks. Functionally, this feature is similar to the IEEE standard 802.3 for PAUSE mechanism, except that it operates at the granularity of individual packet priorities or traffic class, instead of port level. When a queue corresponding to traffic with a particular traffic class reaches a predetermined, either auto or statically set, threshold, the switch chip generates a PFC frame and sends it back to the sender. For PFC to work effectively end to end on the network, all switches and hosts in the traffic path are configured to enable PFC, and configured for traffic class to priority mappings.

This command allows you to display PFC stats on ports.

Syntax   port-pfc-stats-show priority priority port-list port-list error error-string

time date/time: yyyy-mm-ddTHH:mm:ss

Displays the date and time for statistics collection.

start-time date/time: yyyy-mm-ddTHH:mm:ss

Displays the start date and time for statistics collection.

end-time date/time: yyyy-mm-ddTHH:mm:ss

Displays the end date and time for statistics collection.

duration duration: #d#h#m#s

Displays the duration for statistics collection.

interval duration: #d#h#m#s

Displays the interval between statistics collection.


Displays the statistics since the start time.

older-than duration: #d#h#m#s

Displays the statistics older than the specified time.

within-last duration: #d#h#m#s

Displays the statistics within a specified time.

port port-list

Displays the port list.

Defaults   None

Access   Network administrator

History   Command introduced in Version 2.5.4.

Usage   This command is used to displays PFC stats information about link level flow control for traffic on the network.

Examples  To display PFC stats, use the following command:

CLI (network-admin@Spine1)port-pfc-stats-show

switch  priority port  error

------- -------- ----- -----

Spine1  2        11-20      

Spine1  3        11-20      

See Also