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Distinguish transport routes, MPLS forwarding entries and regular IP routing when troubleshooting is relevant to the different engineering topic "MPLS route and forwarding tables", but it is not the most directly supported technical design or decision for this precise case: An operator sees a working SR prefix SID but no RSVP session. the best answer here is: Use IGP SPF results and segment labels to validate shortest-path SR-MPLS forwarding.

That option concerns BGP message processing. A prefix segment generally follows IGP shortest-path computation, unlike an arbitrary unconstrained manual route.

Recognize ingress push, transit swap and egress pop actions along a label-switched path is relevant to the different engineering topic "MPLS push swap pop forwarding", but it is not the most directly supported technical design or decision for this precise case: An operator sees a working SR prefix SID but no RSVP session. the best answer here is: Use IGP SPF results and segment labels to validate shortest-path SR-MPLS forwarding.

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: An operator sees a working SR prefix SID but no RSVP session. the best answer here is: Confirm that SR segment routing need not rely on RSVP per-LSP signaling.

Verify route resolution to the intended LSP next hop is relevant to the different engineering topic "MPLS route and forwarding tables", but it is not the most directly supported implementation and troubleshooting step for this precise case: An operator sees a working SR prefix SID but no RSVP session. the best answer here is: Confirm that SR segment routing need not rely on RSVP per-LSP signaling.

Inspect term order and matching conditions against show route receive-protocol bgp is relevant to the different engineering topic "BGP inbound routing policy", but it is not the most directly supported implementation and troubleshooting step for this precise case: An operator sees a working SR prefix SID but no RSVP session. the best answer here is: Confirm that SR segment routing need not rely on RSVP per-LSP signaling.

The required downstream binding appears after repair is relevant to the different engineering topic "MPLS label binding and retention", but it is not the most directly supported operational verification evidence for this precise case: An operator sees a working SR prefix SID but no RSVP session. the best answer here is: The path is validated by IGP SID and label forwarding state.

That option concerns LDP session discovery. A prefix segment generally follows IGP shortest-path computation, unlike an arbitrary unconstrained manual route.

That option concerns IPv6 link-local next-hop scope. A prefix segment generally follows IGP shortest-path computation, unlike an arbitrary unconstrained manual route.

That option concerns Provider bridging Q-in-Q. MPLS path viability requires appropriate IP reachability, label bindings and label forwarding at each hop.

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 customer service fails only when transiting an MPLS backbone. the best answer here is: Trace labeled forwarding across ingress, transit and egress before treating a customer VPN problem as BGP-only.

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 customer service fails only when transiting an MPLS backbone. the best answer here is: Trace labeled forwarding across ingress, transit and egress before treating a customer VPN problem as BGP-only.

Inspect how the ingress imposes the outgoing label stack is relevant to the different engineering topic "MPLS push swap pop forwarding", but it is not the most directly supported implementation and troubleshooting step for this precise case: A customer service fails only when transiting an MPLS backbone. the best answer here is: Check ingress transport resolution, transit label swap and egress disposition.

That option concerns Active-route versus hidden-route triage. MPLS path viability requires appropriate IP reachability, label bindings and label forwarding at each hop.

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: A customer service fails only when transiting an MPLS backbone. the best answer here is: Check ingress transport resolution, transit label swap and egress disposition.

That option concerns OSPF interface network type. MPLS path viability requires appropriate IP reachability, label bindings and label forwarding at each hop.

The established LSP follows the intended allowed nodes is relevant to the different engineering topic "RSVP explicit-route constraints", but it is not the most directly supported operational verification evidence for this precise case: A customer service fails only when transiting an MPLS backbone. the best answer here is: The fault is isolated to a specific LSP hop or egress context.

The incoming label resolves to a valid outgoing action is relevant to the different engineering topic "MPLS route and forwarding tables", but it is not the most directly supported operational verification evidence for this precise case: A customer service fails only when transiting an MPLS backbone. the best answer here is: The fault is isolated to a specific LSP hop or egress context.

That option concerns Penultimate-hop popping. MPLS path viability requires appropriate IP reachability, label bindings and label forwarding at each hop.

Interpret MPLS shim-label fields including label value, traffic class, bottom-of-stack and TTL is relevant to the different engineering topic "MPLS label-stack header", but it is not the most directly supported technical design or decision for this precise case: MPLS forwarding works for one FEC but not another over the same core. the best answer here is: Trace labeled forwarding across ingress, transit and egress before treating a customer VPN problem as BGP-only.

That option concerns IBGP route propagation constraints. MPLS path viability requires appropriate IP reachability, label bindings and label forwarding at each hop.

That option concerns IS-IS Level-1/Level-2 reachability. MPLS path viability requires appropriate IP reachability, label bindings and label forwarding at each hop.

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: MPLS forwarding works for one FEC but not another over the same core. the best answer here is: Compare label mappings and active LSPs for each FEC.

Check each constrained hop and path admissibility is relevant to the different engineering topic "RSVP explicit-route constraints", but it is not the most directly supported implementation and troubleshooting step for this precise case: MPLS forwarding works for one FEC but not another over the same core. the best answer here is: Compare label mappings and active LSPs for each FEC.

That option concerns RSVP LSP signaling. MPLS path viability requires appropriate IP reachability, label bindings and label forwarding at each hop.

That option concerns BGP IPv6 unicast family. MPLS path viability requires appropriate IP reachability, label bindings and label forwarding at each hop.

That option concerns Segment-routing MPLS prefix SIDs. MPLS path viability requires appropriate IP reachability, label bindings and label forwarding at each hop.

Configure OSPFv3 on the intended IPv6-capable interface and verify link-local neighbor transport is relevant to the different engineering topic "OSPFv3 neighbor formation", but it is not the most directly supported technical design or decision for this precise case: A new IPv6 customer subnet requires a default route through an adjacent IPv6 gateway. the best answer here is: Configure IPv6 static route destinations and next hops using proper IPv6 address semantics.

Use the outgoing interface context when resolving a link-local IPv6 next hop is relevant to the different engineering topic "IPv6 link-local next-hop scope", but it is not the most directly supported technical design or decision for this precise case: A new IPv6 customer subnet requires a default route through an adjacent IPv6 gateway. the best answer here is: Configure IPv6 static route destinations and next hops using proper IPv6 address semantics.

That option concerns Aggregated-Ethernet minimum links. IPv6 route selection still requires a valid reachable next hop and appropriate routing table context.

Enable OSPFv3 in the appropriate area and verify interface state is relevant to the different engineering topic "OSPFv3 neighbor formation", but it is not the most directly supported implementation and troubleshooting step for this precise case: A new IPv6 customer subnet requires a default route through an adjacent IPv6 gateway. the best answer here is: Add the approved ::/0 route with a reachable IPv6 next hop.

That option concerns BGP IPv6 unicast family. IPv6 route selection still requires a valid reachable next hop and appropriate routing table context.

That option concerns IS-IS Level-1/Level-2 reachability. IPv6 route selection still requires a valid reachable next hop and appropriate routing table context.