This is the destination IP address this dynamically-signaled co-routed tunnel targets, inheriting the tunnel-group's address if unspecified and immutable once created, remaining the fixed endpoint for the bidirectional circuit regardless of path changes. An admin relies on this staying constant as the anchor for both directions of the circuit even as RSVP-TE varies the actual route taken to reach it. For example, this destination staying at 10.120.0.9 across re-signaling events confirms the circuit always converges on the intended remote endpoint.