DCB-DCBX(8) Linux DCB-DCBX(8)

# [NAME](#NAME)

dcb-dcbx - show / manipulate port DCBX (Data Center Bridging eXchange)

# [SYNOPSIS](#SYNOPSIS)

**dcb** \[ *OPTIONS* ] **dcbx** { *COMMAND* | *help* }

**dcb dcbx show dev** DEV

**dcb dcbx set dev** DEV \[ **host** ] \[ **lld-managed** ] \[ **cee** ] \[ **ieee** ] \[ **static** ]

# [DESCRIPTION](#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-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](#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**](#host)

[**lld-managed**](#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**](#cee)

[**ieee**](#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**](#static)

Indicates the engine supports static configuration. No actual negotiation is performed, negotiated parameters are always the initial configuration.

# [EXAMPLE & USAGE](#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)

Exit status is 0 if command was successful or a positive integer upon failure.

# [SEE ALSO](#SEE_ALSO)

[**dcb**(8)](/man/os/iproute2/dcb.8)

# [REPORTING BUGS](#REPORTING_BUGS)

Report any bugs to the Network Developers mailing list **<netdev@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](#AUTHOR)

Petr Machata <me@pmachata.org>

13 December 2020 iproute2

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Document: dcb-dcbx(8) from iproute2 7.2.0-r1 (Chainguard OS)
Source: https://kernel.googlesource.com/pub/scm/network/iproute2/iproute2