lldptool-pfc

lldptool(8)                          Linux                         lldptool(8)



NAME
       PFC - Show / manipulate PFC TLV configuration

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

       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
              thresholds 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
       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

       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)