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)