On Apache
Under GNU General Public License
2025-11-21 16:50 @216.73.216.57 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
DCB-PFC(8) Linux DCB-PFC(8)
NAME
dcb-pfc - show / manipulate PFC (Priority-based Flow Control) settings of the DCB (Data
Center Bridging) subsystem
SYNOPSIS
dcb [ OPTIONS ] pfc { COMMAND | help }
dcb pfc show dev DEV [ pfc-cap ] [ prio-pfc ] [ macsec-bypass ] [ delay ] [ requests ] [
indications ]
dcb pfc set dev DEV [ prio-pfc PFC-MAP ] [ macsec-bypass { on | off } ] [ delay INTEGER ]
PFC-MAP := [ PFC-MAP ] PFC-MAPPING
PFC-MAPPING := { PRIO | all }:{ on | off }
PRIO := { 0 .. 7 }
DESCRIPTION
dcb pfc is used to configure Priority-based Flow Control attributes through Linux DCB
(Data Center Bridging) interface. PFC permits marking flows with a certain priority as
lossless, and holds related configuration, as well as PFC counters.
PARAMETERS
For read-write parameters, the following describes only the write direction, i.e. as used
with the set command. For the show command, the parameter name is to be used as a simple
keyword without further arguments. This instructs the tool to show the value of a given
parameter. When no parameters are given, the tool shows the complete PFC configuration.
pfc-cap
A read-only property that shows the number of traffic classes that may simultane-
ously support PFC.
requests
A read-only count of the sent PFC frames per traffic class. Only shown when -s is
given, or when requested explicitly.
indications
A read-only count of the received PFC frames per traffic class. Only shown when -s
is given, or when requested explicitly.
macsec-bypass { on | off }
Whether the sending station is capable of bypassing MACsec processing when MACsec
is disabled.
prio-pfc PFC-MAP
PFC-MAP uses the array parameter syntax, see dcb(8) for details. Keys are priori-
ties, values are on / off indicators of whether PFC is enabled for a given prior-
ity.
delay INTEGER
The allowance made for round-trip propagation delay of the link in bits. The value
shall be 0..65535.
EXAMPLE & USAGE
Enable PFC on priorities 6 and 7, leaving the rest intact:
# dcb pfc set dev eth0 prio-pfc 6:on 7:on
Disable PFC of all priorities except 6 and 7, and configure delay to 4096 bits:
# dcb pfc set dev eth0 prio-pfc all:off 6:on 7:on delay 0x1000
Show what was set:
# dcb pfc show dev eth0
pfc-cap 8 macsec-bypass off delay 4096
prio-pfc 0:off 1:off 2:off 3:off 4:off 5:off 6:on 7:on
EXIT STATUS
Exit status is 0 if command was successful or a positive integer upon failure.
SEE ALSO
dcb(8)
REPORTING BUGS
Report any bugs to the Network Developers mailing list <netdev AT vger.org> where the
development and maintenance is primarily done. You do not have to be subscribed to the
list to send a message there.
AUTHOR
Petr Machata <me AT pmachata.org>
iproute2 31 October 2020 DCB-PFC(8)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2025-11-21 16:50 @216.73.216.57 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)