---
name: "dcb-dcbx"
section: "8"
platform: "linux"
package: "iproute2"
version: "7.3.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/dcb-dcbx"
---

# dcb-dcbx(8)

show / manipulate port DCBX (Data Center Bridging eXchange)

## 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-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 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.

## 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)](/dcb/8.md)

## 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

Petr Machata \<me@pmachata.org\>