The enhanced protocol is required to support MPLS on the stacking links between Summit X460, X480, and X670 series switches, and on the switch fabric of BlackDiamond 8800 series switches. On Summit X460, X480, and X670 series switches, the standard protocol previously used on these switches does not support MPLS.
Note
The Summit X670-G2 and X770 only support the enhanced protocol.For information on selecting the enhanced stacking port protocol, see Selecting the Stacking Protocol.