DCBX version support for IEEE DCBX and DCBX version 1.01

Enables you to configure the DCBX version that each port supports on a per-port basis. You can configure a port to use IEEE DCBX or DCBX version 1.01, or you can configure a port to autonegotiate with the connected peer to set the DCBX version. The default mode is autonegotiation. Configure the DCBX version by including the mode statement at the [edit protocols dcbx interface interface-name] hierarchy level. You can also disable the ETS recommendation TLV advertisement by including the recommendation-tlv no-auto-negotiate statement at the [edit protocols dcbx interface interface-name enhanced-transmission-selection] hierarchy level.