Port Roles; Interoperability With Ieee Dcbx - Dell Networking 2024 Reference Manual

Hide thumbs Also See for Networking 2024:

Table of Contents

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.

The Dell 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:

2 Auto-Upstream

3 Auto-Downstream

4 Configuration Source

Data Center Bridging Commands

Table of Contents