Dell S4820T, Configuration Manual

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If you configure a DCBx port to operate with a specific version (the
DCBx version {cee | cin |
ieee-v2.5}
command in the Configuring DCBx ), DCBx operations are performed according to the
configured version, including fast and slow transmit timers and message formats. If a DCBx frame with a
different version is received, a syslog message is generated and the peer version is recorded in the peer
status table. If the frame cannot be processed, it is discarded and the discard counter is incremented.
NOTE: Because DCBx TLV processing is best effort, it is possible that CIN frames may be processed
when DCBx is configured to operate in CEE mode and vice versa. In this case, the unrecognized
TLVs cause the unrecognized TLV counter to increment, but the frame is processed and is not
discarded.
Legacy DCBx (CIN and CEE) supports the DCBx control state machine that is defined to maintain the
sequence number and acknowledge the number sent in the DCBx control TLVs.
DCBx Example
The following figure shows how to use DCBx.
The external 40GbE 40GbE ports on the base module (ports 33 and 37) of two switches are used for
uplinks configured as DCBx auto-upstream ports. The device is connected to third-party, top-of-rack
(ToR) switches through 40GbE uplinks. The ToR switches are part of a Fibre Channel storage network.
The internal ports (ports 1-32) connected to the 10GbE backplane are configured as auto-downstream
ports.
On the S4820T, PFC and ETS use DCBx to exchange link-level configuration with DCBx peer devices.
Figure 33. DCBx Sample Topology
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Data Center Bridging (DCB)