Provided by: lldpad_0.9.46-3.1_i386 bug


       dcbtool  -  manage the Data Center Bridging (DCB) settings of a CEE DCB


       dcbtool -h
       dcbtool -v
       dcbtool [-rR]
       dcbtool [-rR] [command] [command arguments]


       dcbtool is used to query and  set  the  DCB  settings  of  a  Converged
       Enhanced Ethernet (CEE) DCB capable Ethernet interface.  It connects to
       the client interface of lldpad to perform  these  operations.   dcbtool
       will  operate  in interactive mode if it is executed without a command.
       In interactive mode, dcbtool also functions as an  event  listener  and
       will  print out events received from lldpad as they arrive. It will use
       libreadline for interactive input when available. 802.1Qaz DCBX is  not
       controllable from dcbtool instead lldptool can be used in this case.


       -h     show the dcbtool usage message

       -v     shows dcbtool version information

       -r     display  the raw lldpad client interface messages as well as the
              readable output.

       -R     display only the raw lldpad client interface messages


       help   shows the dcbtool usage message

       ping   test command.   lldpad  responds  with  "PPONG"  if  the  client
              interface is operational.

              displays dcbtool license information

       quit   exit from interactive mode

       The  following  commands  interact with lldpad to manage the daemon and
       DCB features on DCB capable interfaces.

       dcbtool general configuration commands:

       <gc|go> dcbx
              Get the configured or operational legacy  version  of  the  DCBX
              protocol  which  will  be  supported  by lldpad.  The configured
              version, if different from the operational version,   will  take
              effect after lldpad is restarted.

       sc dcbx v:[cin|cee|force-cin|force-cee]
              Set the legacy version of DCBX which will be supported by lldpad
              the next time it is started.
              Information about the CIN version can be found at:
              Information about the CEE version can be found at:
              The  dcbx  setting  is  a  global  setting and changes only take
              effect when lldpad is restarted.  The default DCBX version  used
              is  the  IEEE  standard  version.  If a pre-IEEE DCBX version is
              received (per port) which matches the dcbx setting, then  lldpad
              will  fall  back  to the configured global dcbx setting.  If the
              dcbx setting is set to either 'force-cin'  or  'force-cee'  then
              any  port  doing DCBX will start out in the corresponding legacy
              DCBX mode.

       DCB per-interface commands:

       gc <ifname> <feature>
              get configuration of feature on interface ifname.

       go <ifname> <feature>
              get operational status of feature on interface ifname.

       gp <ifname> <feature>
              get peer configuration of feature on interface ifname.

       sc <ifname> <feature> <args>
              set the configuration of feature on interface ifname.

       feature may be one of the following:

       dcb    DCB state of the port

       pg     priority groups

       pfc    priority flow control

              application specific data

              logical link status

       subtype can be:

       0|fcoe Fiber Channel over Ethernet (FCoE)

              Internet Small Computer System Interface (iSCSI)

       2|fip  FCoE Initialization Protocol (FIP)

       args can include:

              controls feature enable

              controls whether the feature is advertised via DCBX to the peer

              controls  whether  the  feature  is  willing   to   change   its
              operational  configuration  based  on  what is received from the

       [feature specific args]
              arguments specific to a DCB feature

       Feature specific arguments for dcb:

       on|off enable or disable DCB for the interface.  The go and gp commands
              are  not  needed  for  the  dcb  feature.   Also, the enable(e),
              advertise(a) and willing(w) arguments are not required.

       Feature specific arguments for pg:

              Priority group ID for the 8  priorities.   From  left  to  right
              (priorities  0-7),  x  is  the  corresponding  priority group ID
              value, which can be  0-7  for  priority  groups  with  bandwidth
              allocations  or  f  (priority  group ID 15) for the unrestricted
              priority group.

              Priority group percentage of link bandwidth.  From left to right
              (priority  groups  0-7),  x  is the percentage of link bandwidth
              allocated  to  the  corresponding  priority  group.   The  total
              bandwidth must equal 100%.

              Priority  percentage  of priority group bandwidth.  From left to
              right (priorities 0-7), x is the percentage  of  priority  group
              bandwidth  allocated  to the corresponding priority.  The sum of
              percentages for priorities which belong  to  the  same  priority
              group must total 100% (except for priority group 15).

              Strict priority setting.  From left to right (priorities 0-7), x
              is 0 or 1.  1 indicates that the priority may utilize all of the
              bandwidth allocated to its priority group.

              Priority   to   traffic  class  mapping.   From  left  to  right
              (priorities 0-7), x is the traffic  class  (0-7)  to  which  the
              priority is mapped.

       Feature specific arguments for pfc:

              Enable/disable  priority  flow  control.   From  left  to  right
              (priorities  0-7),  x  is  0  or  1.   1  indicates   that   the
              corresponding priority is configured to transmit priority pause.

       Feature specific arguments for app:<subtype>:
              The  app  features  uses  global enable and willing bits for all
              subtypes. To remove or add subtypes to the TLV set the advertise

              xx  is  a hexadecimal value representing an 8 bit bitmap where 1
              bits indicate the priorities which frames for  the  applications
              specified  by  subtype  should use. The lowest order bit maps to
              priority 0.

       Feature specific arguments for ll:<subtype>:

              For testing purposes, the logical link status may be set to 0 or
              1.   Changes  to  the  logical  link status are not saved in the
              configuration file.


       Enable DCB on interface eth2

       dcbtool sc eth2 dcb on

       Assign priorities 0-3 to priority group 0, priorities 4-6  to  priority
       group  1  and  priority 7 to the unrestricted priority.  Also, allocate
       25% of link bandwidth to priority group 0 and 75% to group 1.

       dcbtool sc eth2 pg pgid:0000111f pgpct:25,75,0,0,0,0,0,0

       Enable transmit of Priority Flow Control for priority 3 and assign FCoE
       to priority 3.

       dcbtool sc eth2 pfc pfcup:00010000
       dcbtool sc eth2 app:0 appcfg:08


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


       dcbtool - DCB configuration utility
       Copyright(c) 2007-2012 Intel Corporation.    Portions  of  dcbtool  are
       based on:


              (c) 2004-2008, Jouni Malinen <>


       This program is free software; you can redistribute it and/or modify it
       under the terms and conditions  of  the  GNU  General  Public  License,
       version 2, as published by the Free Software Foundation.

       This  program is distributed in the hope it will be useful, but WITHOUT
       ANY WARRANTY; without even the implied warranty of  MERCHANTABILITY  or
       FITNESS  FOR  A PARTICULAR PURPOSE.  See the GNU General Public License
       for more details.

       You should have received a copy of the GNU General Public License along
       with this program; if not, write to the Free Software Foundation, Inc.,
       51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

       The full GNU General Public License is included in this distribution in
       the file called "COPYING".


       Contact Information: open-lldp Mailing List <>

                                March 23, 2012                      dcbtool(8)