1- IGP ( OSPF or ISIS extensions)
...
3- IGP shortcut ( IGP will point/Next-hop to an LSP if possible )
4- ISIS wide-area metrics
set protocols ospf traffic-engineering
set protocols isis level 2 wide-metrics-only
set protocols isis level 1 wide-metrics-only
set protocols isis traffic-engineering family inet shortcuts
set protocols isis traffic-engineering family inet shortcuts
set protocols mpls traffic-engineering ?