DCB-DCBX(8) - phpMan

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 config-
uration information with directly connected peers. The Linux DCBX object is a 1-byte bit-
field 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.

PARAMETERS
When used with dcb dcbx set, the following keywords enable the corresponding configura-
tion. 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 ex-
clusive, but dcb dcbx allows setting both and lets the driver handle it as appro-
priate.

cee
ieee The device supports CEE (Converged Enhanced Ethernet) and, respecively, IEEE ver-
sion 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 per-
formed, negotiated parameters are always the initial configuration.

EXAMPLE & USAGE
Put the DCB engine into the "host" mode of operation, and use IEEE-standardized DCB inter-
faces:

# 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.