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Enabling supported loop guard on eligible non-designated point-to-point spanning-tree ports would not interpret per-instance RSTP/MST port roles and forwarding states.

Mapping the VLAN groups into separate MST instances and tune root priorities per instance would not interpret per-instance RSTP/MST port roles and forwarding states.

Aligning MST region name, revision and VLAN-to-instance mapping on the intended region members would not interpret per-instance RSTP/MST port roles and forwarding states.

This test measures a different behavior: Suppress BPDUs in a lab and confirm the port enters loop-inconsistent rather than transitioning to designated forwarding. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare port state for each VLAN/MST instance with physical interface status.

This test measures a different behavior: Inspect MST configuration digests and boundary-port behavior on both peers. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare port state for each VLAN/MST instance with physical interface status.

This test measures a different behavior: Check each instance root and link roles against the intended uplink path. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare port state for each VLAN/MST instance with physical interface status.

That diagnosis is supported by a different symptom: An intra-region link acts as an MST boundary and yields unexpected instance topology. Here the recorded observation is: the interface is physically up but carries some VLANs and blocks others as designed. The applicable cause is: per-instance STP forwarding state was confused with physical-link operability.

That diagnosis is supported by a different symptom: A blocked alternate port starts forwarding after BPDUs cease, creating a loop. Here the recorded observation is: the interface is physically up but carries some VLANs and blocks others as designed. The applicable cause is: per-instance STP forwarding state was confused with physical-link operability.

That diagnosis is supported by a different symptom: Both VLAN groups follow one uplink because all VLANs were left in the same MST instance. Here the recorded observation is: the interface is physically up but carries some VLANs and blocks others as designed. The applicable cause is: per-instance STP forwarding state was confused with physical-link operability.

That control reduces a separate risk: The MST region configuration digest differs because VLAN-to-instance mapping is inconsistent. For the described design, the recurring risk arises from: per-instance STP forwarding state was confused with physical-link operability. The specific required safeguard is: include VLAN/instance-qualified show output in STP diagnostic runbooks.

Loop guard protects against certain STP failures; the described blocked port may be a normal decision for its VLAN instance.

Changing VLAN-to-instance assignments is not justified before checking the actual per-instance STP port role and forwarding state.

Using the EIGRP feasible successor where the feasibility condition is met to enable fast local backup would not address the need for prefer standards-based link-state OSPF when interoperability across multiple vendors is a hard constraint.

Adjusting OSPF reference bandwidth consistently so interface costs distinguish available link speeds would not address the need for prefer standards-based link-state OSPF when interoperability across multiple vendors is a hard constraint.

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

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: confirm adjacency and route exchange between two supported vendor platforms in a pilot.

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: confirm adjacency and route exchange between two supported vendor platforms in a pilot.

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

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: an enterprise router cannot participate in a proprietary vendor-specific routing process. The applicable cause is: eIGRP multi-vendor interoperability was assumed where the peer lacks suitable support.

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: an enterprise router cannot participate in a proprietary vendor-specific routing process. The applicable cause is: eIGRP multi-vendor interoperability was assumed where the peer lacks suitable support.

That diagnosis is supported by a different symptom: Traffic uses equal-cost links despite a tenfold capacity difference. Here the recorded observation is: an enterprise router cannot participate in a proprietary vendor-specific routing process. The applicable cause is: eIGRP multi-vendor interoperability was assumed where the peer lacks suitable support.

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 multi-vendor interoperability was assumed where the peer lacks suitable support. The specific required safeguard is: maintain protocol/platform interoperability requirements in routing architecture decisions.

That control reduces a separate risk: The OSPF reference-bandwidth value causes both links to receive minimum cost one. For the described design, the recurring risk arises from: eIGRP multi-vendor interoperability was assumed where the peer lacks suitable support. The specific required safeguard is: maintain protocol/platform interoperability requirements in routing architecture decisions.

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: eIGRP multi-vendor interoperability was assumed where the peer lacks suitable support. The specific required safeguard is: maintain protocol/platform interoperability requirements in routing architecture decisions.

Prepend the customer's own ASN on advertisements sent through the backup eBGP peer as appropriate would not meet the need for the EIGRP feasible successor where the feasibility condition is met to enable fast local backup.

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

Prefer standards-based link-state OSPF when interoperability across multiple vendors is a hard constraint would not meet the need for the EIGRP feasible successor where the feasibility condition is met to enable fast local backup.

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: inspect topology table successor/feasible-successor metrics and test route switch on successor loss.

This test measures a different behavior: Inspect the AS_PATH actually advertised to backup and primary providers. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect topology table successor/feasible-successor metrics and test route switch on successor loss.

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: inspect topology table successor/feasible-successor metrics and test route switch on successor loss.

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.