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Why not extend this mechanism? LSP_TUNNEL_INTERFACE_ID Object
Extend it as follows.

C-Type Meaning Reference
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1 Unnumbered interface identifier [RFC3477]
2 (TBD) IPv4 interface identifier with target [2.3.2, HIER-bis]
3 (TBD) IPv6 interface identifier with target [2.3.3, HIER-bis]
4 (TBD) Unnumbered interface with target [2.3.4, HIER-bis]
PPT Version