.TH lldptool 8 "February 2010" "open-lldp" "Linux"
.SH NAME
PFC \- Show / manipulate PFC TLV configuration
.SH SYNOPSIS
.B lldptool -t -i ethx -V PFC { willing | enabled | delay | numtcs }
.sp
.B lldptool -T -i ethx -V PFC
.RI <-c " " CONFIG_ARG " " ...>
.sp
.ti +4
.IR	CONFIG_ARG " := 
.sp
.BR		enableTx " = " {yes|no} " | "
.sp
.BR		willing " = " {0|1} " | "
.sp
.BR		enabled " = " [0..7],[0..7],... " | "
.sp
.BR		delay " = " integer
.sp
.SH DESCRIPTION
The PFC TLV is used to display and set current PFC TLV
attributes.

.SH ARGUMENTS
.TP
.B enableTx
Enable the PFC TLV to be transmitted in the LLDP PDU for the
specified interface.
.TP
.B willing
Display or set willing attribute. If set and peer TLV is received
the peer PFC attributes will be used. If cleared locally configured
attributes are used.
.TP
.B enabled
Display or set priorities with PFC enabled. The set attribute
takes a comma separated list of priorities to enable.
.TP
.B delay 
Display or set delay attribute used to configure PFC thresholds in
hardware buffers. If PFC is enabled and frames continue to be dropped
due to full hardware buffers increasing this value may help.

.SH Theory of Operations
The PFC TLV uses Symmetric attribute passing meaning the attributes
used will depend on the willing bit. If the willing bit is enabled
and a peer TLV is received the peers attributes will be used. If the
willing bit is set to 0 the local attributes should be used. When
both the peer and local configuration are willing a tie breaking
scheme is used. For more detailed coverage see the specification.

.SH EXAMPLE & USAGE
.TP
Enable PFC for priorities 1, 2, and 4 on \fIeth2\fR
.B lldptool -T -i eth2 -V PFC enabled=1,2,4
.TP
Display priorities enabled for PFC on \fIeth2\fR
.B lldptool -t -i eth2 -V PFC -c enabled 
.TP
Display last transmitted PFC TLV on \fIeth2\fR
.B lldptool -t -i eth2 -V PFC 
.SH SOURCE
.TP
o
IEEE 802.1Qaz (http://www.ieee802.org/1/pages/dcbridges.html)

.SH NOTES

.SH SEE ALSO
.BR lldptool (8),
.BR lldpad (8)

.SH AUTHOR
John Fastabend