ISIS: TE

router isis
metric-style wide
mpls traffic-eng tunnel level-2
mpls traffic-eng tunnel router-id lo0

==> Side Effects
If there is a router somewhere else that you missed out configuring "metric-style wide" , ISIS adj will go down,

Ref: INE Workbook VOl2 V1.0 Lab 7 Task 5.4 ( Traffic Engineering)

############Alternative ####################################
configure the R3 router with foll
router isis
metric-style transition

Here is why

metric-style transition

To configure a router to generate and accept both old-style and new-style TLVs (TLV stands for type, length, and value object), use the metric-style transition command in router configuration mode.

metric-style transition {level-1 | level-2 | level-1-2}

Syntax Description

level-1	Enables this command on routing level 1.
level-2	Enables this command on routing level 2.
level-1-2	Enables this command on routing levels 1 and 2.

Defaults

IS-IS traffic engineering extensions include new-style TLVs with wider metric fields than old-style TLVs. By default, the MPLS traffic engineering image generates old-style TLVs only. To do MPLS traffic engineering, a router needs to generate new-style TLVs.