dcbtool - manage the Data Center Bridging (DCB) settings of a DCB
dcbtool [-rR] [command] [command arguments]
dcbtool is used to query and set the DCB settings of a DCB capable
Ethernet interface. It connects to the client interface of dcbd 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
dcbd as they arrive.
-h show the dcbtool usage message
-v shows dcbtool version information
-r display the raw dcbd client interface messages as well as the
-R display only the raw dcbd client interface messages
help shows the dcbtool usage message
ping test command. The dcbd daemon responds with "PPONG" if the
client interface is operational.
displays dcbtool license information
quit exit from interactive mode
The following commands interact with the dcbd daemon to manage the
daemon and DCB features on DCB capable interfaces.
dcbd general configuration commands:
get the configured or operational version of the DCB
capabilities exchange protocol. If different, the configured
version will take effect (and become the operational version)
after dcbd is restarted.
sc dcbx v:[1|2]
set the version of the DCB capabilities exchange protocol which
will be used the next time dcbd is started. Information about
version 1 can be found at:
Information about version 2 can be found at:
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)
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 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>:
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
Feature specific arguments for ll:<subtype>:
For testing purposes, the logical link status may be set to 0 or
1. This setting is not persisted in the configuration file.
Enable DCB on interface eth2
dcbtool sc eth2 dcb on
Assign priorites 0-3 to priority group 0, priorites 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
dcbtool - DCB configuration utility
Copyright(c) 2007-2009 Intel Corporation. Portions of dcbtool are
(c) 2004-2008, Jouni Malinen <firstname.lastname@example.org>
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: e1000-eedc Mailing List
<email@example.com> Intel Corporation, 5200 N.E. Elam
Young Parkway, Hillsboro, OR 97124-6497
June 29, 2009 dcbtool(8)