https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_setup/configuration/xe-3s/mp-te-path-setup-xe-3s-book/mp-te-fwd-adjacency.html
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The MPLS Traffic Engineering Forwarding Adjacency feature allows a network administrator to handle a traffic engineering (TE) label switched path (LSP) tunnel as a link in an Interior Gateway Protocol (IGP) network based on the Shortest Path First (SPF) algorithm.
Both Intermediate System-to-Intermediate System (IS-IS) and Open Shortest Path First (OSPF) are supported.
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You have to first enable forwarding-adjacency:
Router(config)# interface tunnel 7
Router(config-if)# tunnel mpls traffic-eng forwarding-adjacency
And then you have to adjust the IGP metrics to prefer the tunnel (lower metric on the tunnel interface):
Router(config-if)# isis metric 2 level-1
or
Router(config-if)# ip ospf cost 6
To include tunnels in the SPF calculations, use forwarding adjacencies.
Forwarding adjacency is a mechanism to allow the announcement of established tunnels via IGP:
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kirrim
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