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 de‐
vice 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 han‐
dled 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 configuration. The keywords that are not men‐
tioned 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. Typi‐
cally 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 al‐
ways 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.