AS5800-EC Series CLI Reference Guide R02

Chapter 22 | Data Center Bridging Commands
DCB Exchange Commands
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dcbx This command enables DCBX on the selected interface. Use the no form to disable
DCBX.
Syntax
[no] dcbx
Default Setting
Enabled
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
◆ DCBX is normally deployed in FCoE topologies to support lossless operation for
FCoE traffic. In these scenarios, all network elements are DCBX enabled. LLDP is
also enabled on any port configured to use DCBX.
◆ DCBX uses LLDP to exchange attributes between two link peers. DCBX does
this by exchanging LLDP TLVs with peer devices to discover DCB capabilities
supported by a peer port, detect misconfiguration of a DCB feature between
the peers on a link, and perform configuration of DCB features on its peer port
if the peer port is willing to accept configuration settings. The configurable
attributes include ETS recommendation, ETS Configuration, and PFC.
◆ DCBX operates over a point to point link. If multiple LLDP peer ports running
DCBX are detected on an interface, then DCBX shall behave as if the peer port's
DCBX TLVs are not present until the multiple LLDP peer port condition is no
longer present.
Example
The following example enables DCBX on port 5:
Console(config)#interface ethernet 1/5
Console(config-if)#dcbx
Console(config-if)#
dcbx mode This command configures the DCBX mode used for message exchange. Use the no
form to restore the default setting.
Syntax
dcbx mode {auto-down | auto-up | configuration-source | manual}
no dcbx mode
auto-down – In auto-downstream mode, the port advertises a
configuration but is not willing to accept one from the link partner.
However, it will accept a configuration propagated internally from the