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