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Identify outer transport and inner service label positions and the S-bit placement is relevant to the different engineering topic "MPLS label-stack header", but it is not the most directly supported implementation and troubleshooting step for this precise case: An RSVP tunnel must avoid a core link under maintenance. the best answer here is: Configure a supported explicit path around the restricted hop.

That option concerns IS-IS Level-1/Level-2 reachability. RSVP-TE can use explicit route objects and constraints, so a viable IGP shortest path alone does not prove a constrained LSP can establish.

Inspect IGP cost change and installed SR forwarding route is relevant to the different engineering topic "SR-MPLS shortest-path transport", but it is not the most directly supported implementation and troubleshooting step for this precise case: An RSVP tunnel must avoid a core link under maintenance. the best answer here is: Configure a supported explicit path around the restricted hop.

The first core hop sees the expected MPLS label is relevant to the different engineering topic "MPLS push swap pop forwarding", but it is not the most directly supported operational verification evidence for this precise case: An RSVP tunnel must avoid a core link under maintenance. the best answer here is: The established LSP follows the intended allowed nodes.

That option concerns Martian-prefix handling. RSVP-TE can use explicit route objects and constraints, so a viable IGP shortest path alone does not prove a constrained LSP can establish.

That option concerns MPLS end-to-end troubleshooting. RSVP-TE can use explicit route objects and constraints, so a viable IGP shortest path alone does not prove a constrained LSP can establish.

That option concerns VSTP per-VLAN tree behavior. RSVP-TE can use explicit route objects and constraints, so a viable IGP shortest path alone does not prove a constrained LSP can establish.

Use IGP SPF results and segment labels to validate shortest-path SR-MPLS forwarding is relevant to the different engineering topic "SR-MPLS shortest-path transport", but it is not the most directly supported technical design or decision for this precise case: A newly configured explicit path fails despite normal IP reachability. the best answer here is: Check explicit-path constraints when engineering RSVP LSP routing through particular core hops.

Differentiate RSVP signaling state failure from underlying IGP reachability is relevant to the different engineering topic "RSVP session and state troubleshooting", but it is not the most directly supported technical design or decision for this precise case: A newly configured explicit path fails despite normal IP reachability. the best answer here is: Check explicit-path constraints when engineering RSVP LSP routing through particular core hops.

Review RSVP interface enablement and path admission requirements is relevant to the different engineering topic "RSVP session and state troubleshooting", but it is not the most directly supported implementation and troubleshooting step for this precise case: A newly configured explicit path fails despite normal IP reachability. the best answer here is: Check each constrained hop and path admissibility.

That option concerns Segment-routing MPLS prefix SIDs. RSVP-TE can use explicit route objects and constraints, so a viable IGP shortest path alone does not prove a constrained LSP can establish.

That option concerns Network-LSA type-two interpretation. RSVP-TE can use explicit route objects and constraints, so a viable IGP shortest path alone does not prove a constrained LSP can establish.

That option concerns Virtual-switch routing instance. RSVP-TE can use explicit route objects and constraints, so a viable IGP shortest path alone does not prove a constrained LSP can establish.

The expected number and ordering of labels are present is relevant to the different engineering topic "MPLS label-stack header", but it is not the most directly supported operational verification evidence for this precise case: A newly configured explicit path fails despite normal IP reachability. the best answer here is: The signaling result identifies the unsatisfied explicit constraint.

The prefix resolves to the expected labeled forwarding class is relevant to the different engineering topic "MPLS forwarding-equivalence classes", but it is not the most directly supported operational verification evidence for this precise case: A newly configured explicit path fails despite normal IP reachability. the best answer here is: The signaling result identifies the unsatisfied explicit constraint.

Verify that a valid label binding exists for the intended FEC before tracing a labeled path is relevant to the different engineering topic "MPLS label binding and retention", but it is not the most directly supported technical design or decision for this precise case: A backbone engineer sees show mpls lsp Down with valid OSPF routes. the best answer here is: Differentiate RSVP signaling state failure from underlying IGP reachability.

That option concerns GRE tunnel forwarding tests. RSVP sessions must successfully signal along a path before the intended signaled MPLS LSP can forward.

That option concerns Segment-routing MPLS prefix SIDs. RSVP sessions must successfully signal along a path before the intended signaled MPLS LSP can forward.

Enable suitable MPLS/RSVP interfaces and define the ingress LSP destination is relevant to the different engineering topic "RSVP LSP signaling", but it is not the most directly supported implementation and troubleshooting step for this precise case: A backbone engineer sees show mpls lsp Down with valid OSPF routes. the best answer here is: Inspect show rsvp session and RSVP signaling error detail.

That option concerns Router-LSA type-one interpretation. RSVP sessions must successfully signal along a path before the intended signaled MPLS LSP can forward.

That option concerns MPLS route and forwarding tables. RSVP sessions must successfully signal along a path before the intended signaled MPLS LSP can forward.

An RSVP session and operational MPLS LSP become visible is relevant to the different engineering topic "RSVP LSP signaling", but it is not the most directly supported operational verification evidence for this precise case: A backbone engineer sees show mpls lsp Down with valid OSPF routes. the best answer here is: The failure is localized to RSVP session or path signaling.

Labeled traffic avoids the link until LDP becomes operational is relevant to the different engineering topic "LDP-IGP synchronization", but it is not the most directly supported operational verification evidence for this precise case: A backbone engineer sees show mpls lsp Down with valid OSPF routes. the best answer here is: The failure is localized to RSVP session or path signaling.

That option concerns OSPF passive-interface and export policy. RSVP sessions must successfully signal along a path before the intended signaled MPLS LSP can forward.

That option concerns RSTP rapid transitions. RSVP sessions must successfully signal along a path before the intended signaled MPLS LSP can forward.

Trace labeled forwarding across ingress, transit and egress before treating a customer VPN problem as BGP-only is relevant to the different engineering topic "MPLS end-to-end troubleshooting", but it is not the most directly supported technical design or decision for this precise case: A traffic-engineered LSP repeatedly tears down at one transit router. the best answer here is: Differentiate RSVP signaling state failure from underlying IGP reachability.

Use LDP-IGP synchronization where premature use of a labeled link could blackhole traffic is relevant to the different engineering topic "LDP-IGP synchronization", but it is not the most directly supported technical design or decision for this precise case: A traffic-engineered LSP repeatedly tears down at one transit router. the best answer here is: Differentiate RSVP signaling state failure from underlying IGP reachability.

Review route-to-FEC association and active transport path is relevant to the different engineering topic "MPLS forwarding-equivalence classes", but it is not the most directly supported implementation and troubleshooting step for this precise case: A traffic-engineered LSP repeatedly tears down at one transit router. the best answer here is: Review RSVP interface enablement and path admission requirements.

Inspect advertised and received label mappings for the target FEC is relevant to the different engineering topic "MPLS label binding and retention", but it is not the most directly supported implementation and troubleshooting step for this precise case: A traffic-engineered LSP repeatedly tears down at one transit router. the best answer here is: Review RSVP interface enablement and path admission requirements.

That option concerns VLAN translation distinction. RSVP sessions must successfully signal along a path before the intended signaled MPLS LSP can forward.

That option concerns BGP next-hop reachability. RSVP sessions must successfully signal along a path before the intended signaled MPLS LSP can forward.

That option concerns RSVP explicit-route constraints, not the requirement in this case.

That option concerns SR-MPLS shortest-path transport. RSVP sessions must successfully signal along a path before the intended signaled MPLS LSP can forward.