Summit x460 doesn't support selective VLAN mapping to VPLS and there is no workaround for this.
VLAN mapping to VPLS is supported on the following platforms:
- Summit X460-G2 (supported from ExtremeXOS 15.6)
- Summit X670-G2 (supported from ExtremeXOS 15.6)
- Summit X670
- Summit X770
- BlackDiamond X8
More details can be found in User Guide