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lldptool(8)			     Linux			   lldptool(8)

NAME
       PFC - Show / manipulate PFC TLV configuration

SYNOPSIS
       lldptool	 -t -i ethx -V PFC [ -c [ willing | enabled | delay | numtcs ]
       ]

       lldptool -T -i ethx -V PFC <CONFIG_ARG=value ...>

	   CONFIG_ARG:=

	    enableTx=<yes|no>

	    willing=<yes|no|0|1>

	    enabled=<none|[0..7],[0..7],...>

	    delay=<integer value>

DESCRIPTION
       The PFC TLV is used to display and set current PFC TLV attributes.

ARGUMENTS
       enableTx
	      Enable the PFC TLV to be transmitted in the  LLDP	 PDU  for  the
	      specified interface.

       willing
	      Display  or  set the willing attribute. If set to yes and a peer
	      TLV is received then the peer PFC attributes will	 be  used.  If
	      set to no then locally configured attributes are used.

       enabled
	      Display  or  set	the  priorities	 with  PFC  enabled.  The  set
	      attribute takes a comma separated list of priorities to  enable,
	      or the string none to disable all priorities.

       delay  Display or set the delay attribute used to configure PFC thresh‐
	      olds in hardware buffers. If PFC is enabled and frames  continue
	      to  be dropped due to full hardware buffers then increasing this
	      value may help.

Theory of Operations
       The PFC TLV uses the Symmetric attribute passing state machine  defined
       in  IEEE	 802.1Qaz.   This means the attributes used will depend on the
       willing bit. If the willing bit is set to 1 and a peer TLV is  received
       then  the peers attributes will be used. If the willing bit is set to 0
       the local attributes will be used. When both the peer and local config‐
       uration	are  willing  a tie breaking scheme is used. For more detailed
       coverage see the specification.

EXAMPLE & USAGE
       Enable PFC for priorities 1, 2, and 4 on eth2
	      lldptool -T -i eth2 -V PFC enabled=1,2,4

       Disable PFC for all priorities on eth2
	      lldptool -T -i eth2 -V PFC enabled=none

       Display configuration of PFC enabled priorities for eth2
	      lldptool -t -i eth2 -V PFC -c enabled

       Display last transmitted PFC TLV on eth2
	      lldptool -t -i eth2 -V PFC

SOURCE
       o      IEEE 802.1Qaz (http://www.ieee802.org/1/pages/dcbridges.html)

NOTES
SEE ALSO
       lldptool(8), lldpad(8)

AUTHOR
       John Fastabend

open-lldp			  August 2012			   lldptool(8)

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