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
configured 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