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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Auto-Detection and Manual Configuration of the DCBx Version

When operating in Auto-Detection mode (the DCBx version auto command), a DCBx port automatically detects the DCBx version on a peer port. Legacy CIN and CEE versions are supported in addition to the standard IEEE version 2.5 DCBx.

A DCBx port detects a peer version after receiving a valid frame for that version. The local DCBx port reconfigures to operate with the peer version and maintains the peer version on the link until one of the following conditions occurs:
  • The switch reboots.
  • The link is reset (goes down and up).
  • User-configured CLI commands require the version negotiation to restart.
  • The peer times out.
  • Multiple peers are detected on the link.

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.

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