Service Provider backbones run Traffic Engineering for its benefits of
redundancy, congestion avoidance etc in the core network.
You need a link state protocol if you want to run MPLS TE
MPLS TE requires an IGP capable of sending all the topology information to
all routers in the area in which TE has been enabled. Only link state protocols
can do this. MPLS TE uses the capabilities of IGP (LSA in case of OSPF and TLVs
in case of ISIS).
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