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Dell Configuration Guide for the S4048–ON System 9.14.2.6

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Data Center Bridging Exchange Protocol (DCBx)

DCBx allows a switch to automatically discover DCB-enabled peers and exchange configuration information. PFC and ETS use DCBx to exchange and negotiate parameters with peer devices. DCBx capabilities include:
  • Discovery of DCB capabilities on peer-device connections.
  • Determination of possible mismatch in DCB configuration on a peer link.
  • Configuration of a peer device over a DCB link.

DCBx requires the link layer discovery protocol (LLDP) to provide the path to exchange DCB parameters with peer devices. Exchanged parameters are sent in organizationally specific TLVs in LLDP data units. The following LLDP TLVs are supported for DCB parameter exchange:

PFC parameters
PFC Configuration TLV and Application Priority Configuration TLV.
ETS parameters
ETS Configuration TLV and ETS Recommendation TLV.

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