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NAME | SYNOPSIS | DESCRIPTION | PARAMETERS | EXAMPLE & USAGE | EXIT STATUS | SEE ALSO | REPORTING BUGS | AUTHOR | COLOPHON |
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DCB-DCBX(8) Linux DCB-DCBX(8)
dcb-dcbx - show / manipulate port DCBX (Data Center Bridging
eXchange)
dcb [ OPTIONS ] dcbx { COMMAND | help }
dcb dcbx show dev DEV
dcb dcbx set dev DEV [ host ] [ lld-managed ] [ cee ] [ ieee ] [
static ]
Data Center Bridging eXchange (DCBX) is a protocol used by DCB
devices to exchange configuration information with directly
connected peers. The Linux DCBX object is a 1-byte bitfield of
flags that configure whether DCBX is implemented in the device or
in the host, and which version of the protocol should be used.
dcb dcbx is used to access the per-port Linux DCBX object.
There are two principal modes of operation: in host mode, DCBX
protocol is implemented by the host LLDP agent, and the DCB
interfaces are used to propagate the negotiate parameters to
capable devices. In lld-managed mode, the configuration is handled
by the device, and DCB interfaces are used for inspection of
negotiated parameters, and can also be used to set initial
parameters.
When used with dcb dcbx set, the following keywords enable the
corresponding configuration. The keywords that are not mentioned
on the command line are considered disabled. When used with show,
each enabled feature is shown by its corresponding keyword.
host
lld-managed
The device is in the host mode of operation and,
respectively, the lld-managed mode of operation, as
described above. In principle these two keywords are
mutually exclusive, but dcb dcbx allows setting both and
lets the driver handle it as appropriate.
cee
ieee The device supports CEE (Converged Enhanced Ethernet) and,
respectively, IEEE version of the DCB specification.
Typically only one of these will be set, but dcb dcbx does
not mandate this.
static indicates the engine supports static configuration. No
actual negotiation is performed, negotiated parameters are
always the initial configuration.
Put the DCB engine into the "host" mode of operation, and use
IEEE-standardized DCB interfaces:
# dcb dcbx set dev eth0 host ieee
Show what was set:
# dcb dcbx show dev eth0
host ieee
Exit status is 0 if command was successful or a positive integer
upon failure.
dcb(8)
Report any bugs to the Network Developers mailing list
<[email protected]> where the development and maintenance is
primarily done. You do not have to be subscribed to the list to
send a message there.
Petr Machata <[email protected]>
This page is part of the iproute2 (utilities for controlling
TCP/IP networking and traffic) project. Information about the
project can be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
[email protected], [email protected]. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-08-08.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to [email protected]
iproute2 13 December 2020 DCB-DCBX(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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