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. There‐
fore 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 excep‐
tion."
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
NOTESSEE ALSOdcbtool(8), lldptool(8), lldptool-ets(8), lldptool-pfc(8), lldptool-
app(8), lldpad(8)AUTHOR
Eric Multanen
open-lldp August 2012 lldptool-dcbx(8)
