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That diagnosis is supported by a different symptom: An enterprise router cannot participate in a proprietary vendor-specific routing process. Here the recorded observation is: a neighboring path is not considered a feasible successor because its reported distance is not lower than the feasible distance. The applicable cause is: eIGRP's feasibility condition prevents an unsafe backup from being preinstalled.

That diagnosis is supported by a different symptom: The backup provider receives an equally short AS_PATH and incoming traffic does not prefer the primary as intended. Here the recorded observation is: a neighboring path is not considered a feasible successor because its reported distance is not lower than the feasible distance. The applicable cause is: eIGRP's feasibility condition prevents an unsafe backup from being preinstalled.

That diagnosis is supported by a different symptom: The EIGRP internal route is installed even though an OSPF advertisement shows a small numerical metric. Here the recorded observation is: a neighboring path is not considered a feasible successor because its reported distance is not lower than the feasible distance. The applicable cause is: eIGRP's feasibility condition prevents an unsafe backup from being preinstalled.

That control reduces a separate risk: No AS_PATH length distinction was created on the backup advertisement. For the described design, the recurring risk arises from: eIGRP's feasibility condition prevents an unsafe backup from being preinstalled. The specific required safeguard is: validate EIGRP reported distances and route-feasibility rather than forcing equal-cost assumptions.

That control reduces a separate risk: EIGRP multi-vendor interoperability was assumed where the peer lacks suitable support. For the described design, the recurring risk arises from: eIGRP's feasibility condition prevents an unsafe backup from being preinstalled. The specific required safeguard is: validate EIGRP reported distances and route-feasibility rather than forcing equal-cost assumptions.

That control reduces a separate risk: Administrative distance determines inter-protocol preference before incomparable metric values. For the described design, the recurring risk arises from: eIGRP's feasibility condition prevents an unsafe backup from being preinstalled. The specific required safeguard is: validate EIGRP reported distances and route-feasibility rather than forcing equal-cost assumptions.

Making the LAN-facing OSPF interface passive while still advertising its connected prefix as appropriate would not adjust OSPF reference bandwidth consistently so interface costs distinguish available link speeds.

Comparing protocol administrative distance would not adjust OSPF reference bandwidth consistently so interface costs distinguish available link speeds.

Prefer standards-based link-state OSPF when interoperability across multiple vendors is a hard constraint would not adjust OSPF reference bandwidth consistently so interface costs distinguish available link speeds.

This test measures a different behavior: Confirm adjacency and route exchange between two supported vendor platforms in a pilot. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare calculated interface costs and best-path choices before/after the change.

This test measures a different behavior: Inspect OSPF interface/passive state and verify no LAN neighbor adjacencies form. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare calculated interface costs and best-path choices before/after the change.

This test measures a different behavior: Check the selected RIB protocol and administrative distance for the route. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare calculated interface costs and best-path choices before/after the change.

That diagnosis is supported by a different symptom: An enterprise router cannot participate in a proprietary vendor-specific routing process. Here the recorded observation is: traffic uses equal-cost links despite a tenfold capacity difference. The applicable cause is: the OSPF reference-bandwidth value causes both links to receive minimum cost one.

That diagnosis is supported by a different symptom: The EIGRP internal route is installed even though an OSPF advertisement shows a small numerical metric. Here the recorded observation is: traffic uses equal-cost links despite a tenfold capacity difference. The applicable cause is: the OSPF reference-bandwidth value causes both links to receive minimum cost one.

That diagnosis is supported by a different symptom: Untrusted LAN hosts receive OSPF Hellos and can attempt to form adjacencies. Here the recorded observation is: traffic uses equal-cost links despite a tenfold capacity difference. The applicable cause is: the OSPF reference-bandwidth value causes both links to receive minimum cost one.

That control reduces a separate risk: EIGRP multi-vendor interoperability was assumed where the peer lacks suitable support. For the described design, the recurring risk arises from: the OSPF reference-bandwidth value causes both links to receive minimum cost one. The specific required safeguard is: standardize reference bandwidth across OSPF participants to avoid inconsistent SPF metrics.

That control reduces a separate risk: Administrative distance determines inter-protocol preference before incomparable metric values. For the described design, the recurring risk arises from: the OSPF reference-bandwidth value causes both links to receive minimum cost one. The specific required safeguard is: standardize reference bandwidth across OSPF participants to avoid inconsistent SPF metrics.

That control reduces a separate risk: The user-facing interface is active for OSPF neighbor discovery instead of passive. For the described design, the recurring risk arises from: the OSPF reference-bandwidth value causes both links to receive minimum cost one. The specific required safeguard is: standardize reference bandwidth across OSPF participants to avoid inconsistent SPF metrics.

Prefer standards-based link-state OSPF when interoperability across multiple vendors is a hard constraint would not meet the need for protocol administrative distance.

Using the EIGRP feasible successor where the feasibility condition is met to enable fast local backup would not meet the need for protocol administrative distance.

Restoring next-hop reachability through appropriate IGP/static routing or supported next-hop-self policy where required would not meet the need for protocol administrative distance.

This test measures a different behavior: Confirm adjacency and route exchange between two supported vendor platforms in a pilot. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check the selected RIB protocol and administrative distance for the route.

This test measures a different behavior: Check BGP next-hop resolution and RIB installation of the previously ineligible prefix. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check the selected RIB protocol and administrative distance for the route.

This test measures a different behavior: Inspect topology table successor/feasible-successor metrics and test route switch on successor loss. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check the selected RIB protocol and administrative distance for the route.

That diagnosis is supported by a different symptom: `show bgp` displays a received network but no usable installed route due to inaccessible next hop. Here the recorded observation is: the EIGRP internal route is installed even though an OSPF advertisement shows a small numerical metric. The applicable cause is: administrative distance determines inter-protocol preference before incomparable metric values.

That diagnosis is supported by a different symptom: A neighboring path is not considered a feasible successor because its reported distance is not lower than the feasible distance. Here the recorded observation is: the EIGRP internal route is installed even though an OSPF advertisement shows a small numerical metric. The applicable cause is: administrative distance determines inter-protocol preference before incomparable metric values.

That diagnosis is supported by a different symptom: An enterprise router cannot participate in a proprietary vendor-specific routing process. Here the recorded observation is: the EIGRP internal route is installed even though an OSPF advertisement shows a small numerical metric. The applicable cause is: administrative distance determines inter-protocol preference before incomparable metric values.

That control reduces a separate risk: EIGRP multi-vendor interoperability was assumed where the peer lacks suitable support. For the described design, the recurring risk arises from: administrative distance determines inter-protocol preference before incomparable metric values. The specific required safeguard is: document redistribution and AD overrides to prevent surprise route selection.

That control reduces a separate risk: EIGRP's feasibility condition prevents an unsafe backup from being preinstalled. For the described design, the recurring risk arises from: administrative distance determines inter-protocol preference before incomparable metric values. The specific required safeguard is: document redistribution and AD overrides to prevent surprise route selection.

That control reduces a separate risk: The BGP NEXT_HOP attribute has no resolvable path in the routing table. For the described design, the recurring risk arises from: administrative distance determines inter-protocol preference before incomparable metric values. The specific required safeguard is: document redistribution and AD overrides to prevent surprise route selection.

Aligning the OSPF hello and dead timers on the adjacency interfaces would not assign distinct stable router IDs and restart/clear the relevant OSPF process as required by the platform.

Interpreting DR/BDR election and normal DROther-to-DROther 2-Way behavior on broadcast networks would not assign distinct stable router IDs and restart/clear the relevant OSPF process as required by the platform.

Configuring the appropriate OSPF point-to-point network type on the dedicated link would not assign distinct stable router IDs and restart/clear the relevant OSPF process as required by the platform.