dcbtool - manage the Data Center Bridging (DCB) settings of a CEE DCB interface
dcbtool [-rR] [command] [command arguments]
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
operate in interactive mode if it is executed without a command
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
can be used in this
- show the dcbtool usage message
- shows dcbtool version information
- display the raw lldpad client interface messages as
well as the readable output.
- display only the raw lldpad client interface
- shows the dcbtool usage message
- test command. lldpad responds with "PPONG"
if the client interface is operational.
- displays dcbtool license information
- exit from interactive mode
The following commands interact with lldpad
to manage the daemon and DCB
features on DCB capable interfaces.
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
- 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
- go <ifname> <feature>
- get operational status of feature on interface
- gp <ifname> <feature>
- get peer configuration of feature on interface
- sc <ifname> <feature>
- set the configuration of feature on interface
may be one of the following:
- DCB state of the port
- priority groups
- priority flow control
- application specific data
- logical link status
- Fiber Channel over Ethernet (FCoE)
- Internet Small Computer System Interface (iSCSI)
- FCoE Initialization Protocol (FIP)
- controls feature enable
- controls whether the feature is advertised via DCBX to the
- controls whether the feature is willing to change its
operational configuration based on what is received from the peer
- [feature specific args]
- arguments specific to a DCB feature
Feature specific arguments for dcb
- 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
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
- 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
- The app features uses global enable and willing bits for
all subtypes. To remove or add subtypes to the TLV set the advertise bit.
- 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:
- 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
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
dcbtool sc eth2 pfc pfcup:00010000
dcbtool sc eth2 app:0 appcfg:08
dcbtool - DCB configuration utility
Copyright(c) 2007-2012 Intel Corporation. Portions of dcbtool are based on:
- (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
Contact Information: open-lldp Mailing List <email@example.com>