lldptool(8)							       Linux							       lldptool(8)

NAME

       PFC - Show / manipulate PFC TLV configuration

SYNOPSIS

       lldptool -t -i ethx -V PFC { willing | enabled | delay | numtcs }

       lldptool -T -i ethx -V PFC <-c CONFIG_ARG ...>

	   CONFIG_ARG :=

	    enableTx = {yes|no} |

	    willing = {0|1} |

	    enabled = [0..7],[0..7],... |

	    delay = integer

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 willing attribute. If set and peer TLV is received the peer PFC attributes will be used. If cleared locally config-
	      ured attributes are used.

       enabled
	      Display or set priorities with PFC enabled. The set attribute takes a comma separated list of priorities to enable.

       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.

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.

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

       Display priorities enabled for PFC on 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							   February 2010						       lldptool(8)