Ubuntu Manpage: DCBX - Show / manipulate DCBX configuration

NAME

       DCBX - Show / manipulate DCBX configuration

SYNOPSIS

       lldptool -t -i ethx -V IEEE-DCBX -c [mode]

       lldptool -T -i ethx -V IEEE-DCBX mode=reset

       lldptool -t -i ethx -V <CIN-DCBX|CEE-DCBX> -c [enableTx]

       lldptool -T -i ethx -V <CIN-DCBX|CEE-DCBX> enableTx=<yes|no>

DESCRIPTION - DCBX MODE

lldpad supports the following versions of the DCB capabilities exchange (DCBX) protocol:

CIN DCBX
<http://download.intel.com/technology/eedc/dcb_cep_spec.pdf>

CEE DCBX
<http://www.ieee802.org/1/files/public/docs2008/az-wadekar-dcbx-capability-
exchange-discovery-protocol-1108-v1.01.pdf>

IEEE DCBX
See the IEEE 802.1Qaz-2011 specification for details."

IEEE DCBX is the default DCBX mode for a DCB capable interface. Therefore the default and
configured IEEE DCBX TLVs will be transmitted when the interface comes up. lldpad can be
globally configured to support one of the legacy DCBX versions (CIN or CEE). If the
remote LLDP agent does not transmit any IEEE DCBX TLVs and does transmit a legacy DCBX TLV
which matches the configured legacy DCBX version, then the DCBX mode will drop back to
legacy DCBX mode. It will not transition back to IEEE DCBX mode until the next link
reset. If lldpad has dropped back to legacy DCBX mode for a given interface and the
daemon is stopped and restarted, the legacy DCBX mode for that interface will be used
instead of starting out in IEEE DCBX mode. This behavior only applies to the case where
lldpad is restarted and is not persistent across a system reboot.

The DCBX mode can be queried and configured by using the special tlvid IEEE-DCBX. There
is not an actual TLV which corresponds to this tlvid. Its use is to query and reset the
IEEE DCBX mode. When queried, IEEE DCBX mode can take the following values:

auto - IEEE DCBX will be used (intially) if lldpad is restarted. An exception is if the
DCBX mode has been forced to a legacy DCBX mode, then the specified legacy mode will be
used. See information about the 'dcbx' parameter in dcbtool(8) for more information about
this exception."

CEE - CEE DCBX will be used if lldpad is restarted

CIN - CIN DCBX will be used if lldpad is restarted

The IEEE DCBX mode can be reset to auto by setting the mode argument to the value reset

DESCRIPTION - DCBX CONFIGURATION

       The detailed configuration of the IEEE DCBX TLVs can be  found  in  related  lldptool  man
       pages for each IEEE DCBX TLV (see lldptool-pfc(8), lldptool-ets(8) and lldptool-app(8)).

       The  detailed  configuration  of the CIN and CEE DCBX TLVs is performed using dcbtool (see
       dcbtool(8)).  However, lldptool can configure the enableTx parameter of the  CIN  and  CEE
       DCBX  TLVs  (as  it  can  with most other TLVs).  Since lldpad only transmits TLVs for one
       version of DCBX on any given interface, the enableTx parameter for the CIN  and  CEE  DCBX
       TLVs  (and  for  the IEEE DCBX feature TLVs) takes effect only when the corresponding DCBX
       version is active.

ARGUMENTS

       mode=reset
              Reset the DCBX mode that will be used if lldpad is restarted by  setting  the  mode
              argument to reset using the special tlvid IEEE-DCBX.

       enableTx
              Enable  the  specified  DCBX  TLV  (CIN-DCBX  or CEE-DCBX) to be transmitted in the
              LLDPDU if that DCBX mode for the specified interface has been selected.

EXAMPLE & USAGE

       Query the current DCBX mode that will be used if lldpad  is  restarted.  (this  is  not  a
       persistent setting)
              lldptool -t -i eth3 -V IEEE-DCBX -c mode

       Reset the DCBX mode to be 'auto' (start in IEEE DCBX mode) after the next lldpad restart
              lldptool -T -i eth3 -V IEEE-DCBX mode=reset

       Enable transmission of the CEE DCBX TLV
              lldptool -T -i eth3 -V CEE-DCBX enableTx=yes

       Disable transmission of the CIN DCBX TLV
              lldptool -T -i eth3 -V CIN-DCBX enableTx=no

       Query the configuration of enableTx for the CEE DCBX TLV
              lldptool -t -i eth3 -V CEE-DCBX -c enableTx

NOTES

AUTHOR

       Eric Multanen