Dell N1100-ON, Reference Manual

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Data Center Technology Commands
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DCBX can be used to detect misconfiguration of a feature between the
peers on a link. Misconfiguration detection is feature-specific because
some features may allow asymmetric configuration.
• Peer configuration of DCB features
DCBX can be used by a device to perform configuration of DCB features
in its peer device if the peer device is willing to accept configuration.
Interoperability with IEEE DCBX
The Dell EMC Networking switch automatically detects if a peer is operating
with either of the two CEE DCBX versions or the IEEE standard DCBX
version. This is the default mode. DCBX can also be configured to manually
select one of the legacy versions or IEEE standard mode. In auto-detect
mode, the switch starts operating in IEEE DCBX mode on a port and if it
detects a legacy DCBX device based on the OUI of the organization TLV,
then the switch changes its DCBX mode on that port to support the version
detected. There is no time out mechanism to move back to IEEE mode.
Once the DCBX peer times out, multiple peers are detected, the link is reset
(link down/up) or as commanded by the operator, DCBX resets its operational
mode to IEEE.
The interaction between DCBX component and other components remains
the same irrespective of the operational mode it is executing. For instance,
DCBX component interacts with PFC to get needed information to pack the
TLVs to be sent out on the interface. Based on the operational control mode
of the port, DCBX packs it in the proper frame format.
Port Roles
Each port’s behavior is dependent on the operational mode of that port and
of other ports in the stack. The port mode is a DCBX configuration item that
is passed to the DCBX clients to control the processing of their configuration
information. There are four port roles:
1 Manual
2 Auto-Upstream
3 Auto-Downstream
4 Configuration Source