DCB-DCBX(8) Linux DCB-DCBX(8)
NAME
dcb-dcbx - show / manipulate port DCBX (Data Center Bridging eXchange)
SYNOPSIS
dcb [ OPTIONS ] dcbx { COMMAND | help }
dcb dcbx show dev DEV
dcb dcbx set dev DEV [ host ] [ lld-managed ] [ cee ] [ ieee ] [ static
]
DESCRIPTION
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-man-
aged mode, the configuration is handled by the device, and DCB inter-
faces are used for inspection of negotiated parameters, and can also be
used to set initial parameters.
PARAMETERS
When used with dcb dcbx set, the following keywords enable the corre-
sponding configuration. The keywords that are not mentioned on the com-
mand 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 prin-
ciple these two keywords are mutually exclusive, but dcb dcbx
allows setting both and lets the driver handle it as appropri-
ate.
cee
ieee The device supports CEE (Converged Enhanced Ethernet) and, re-
spectively, 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.
EXAMPLE & USAGE
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
Exit status is 0 if command was successful or a positive integer upon
failure.
SEE ALSO
dcb(8)
REPORTING BUGS
Report any bugs to the Network Developers mailing list <net-
dev@vger.kernel.org> where the development and maintenance is primarily
done. You do not have to be subscribed to the list to send a message
there.
AUTHOR
Petr Machata <me@pmachata.org>
iproute2 13 December 2020 DCB-DCBX(8)
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