lldptool-dcbx(8)						       Linux							  lldptool-dcbx(8)

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  per-
       sistent 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

SEE ALSO

       dcbtool(8), lldptool(8), lldptool-ets(8), lldptool-pfc(8), lldptool-app(8), lldpad(8)

AUTHOR

       Eric Multanen

open-lldp							    August 2012 						  lldptool-dcbx(8)