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This concern applies to OSPF passive customer subnet in a different scenario where operators need to advertise an access subnet without accepting routing hellos from its subscribers. For the deployed OSPF designated router election approach, the relevant caution is instead that DR priority changes alone do not always trigger immediate reelection.

This concern applies to BGP neighbor TCP authentication in a different scenario where operators need to ensure an external BGP session establishes only with peers possessing the agreed session authentication material. For the deployed OSPF designated router election approach, the relevant caution is instead that DR priority changes alone do not always trigger immediate reelection.

This concern applies to IS-IS NET system identity in a different scenario where operators need to ensure two routers in the same IS-IS domain have distinct system identifiers. For the deployed OSPF designated router election approach, the relevant caution is instead that DR priority changes alone do not always trigger immediate reelection.

OSPF hello dead timer mismatch instead addresses a different condition: repair a failed OSPF neighbor relationship caused by unequal hello or dead intervals. It would instead require you to align the OSPF hello and dead timer values at both ends, not the stated goal to favor a specific provider link with shorter calculated OSPF path cost.

OSPF area mismatch diagnosis instead addresses a different condition: recover adjacency on a link whose routers are configured in different areas. It would instead require you to place both sides in the intended matching OSPF area, not the stated goal to favor a specific provider link with shorter calculated OSPF path cost.

BFD cross-protocol fast detection instead addresses a different condition: provide a common rapid link-failure signal to multiple supported routing protocols. It would instead require you to establish BFD sessions and bind the required routing clients to them, not the stated goal to favor a specific provider link with shorter calculated OSPF path cost.

The proposed step is for OSPF hello dead timer mismatch, whose purpose is to repair a failed OSPF neighbor relationship caused by unequal hello or dead intervals. It would not perform the necessary OSPF interface cost control operation: set an appropriate OSPF interface cost rather than changing BGP policy.

The proposed step is for OSPF area mismatch diagnosis, whose purpose is to recover adjacency on a link whose routers are configured in different areas. It would not perform the necessary OSPF interface cost control operation: set an appropriate OSPF interface cost rather than changing BGP policy.

The proposed step is for BFD cross-protocol fast detection, whose purpose is to provide a common rapid link-failure signal to multiple supported routing protocols. It would not perform the necessary OSPF interface cost control operation: set an appropriate OSPF interface cost rather than changing BGP policy.

The observation would verify OSPF hello dead timer mismatch under the separate requirement to repair a failed OSPF neighbor relationship caused by unequal hello or dead intervals. It does not demonstrate the needed OSPF interface cost control result: the SPF tree and installed next hop reflect the new cumulative cost.

The observation would verify OSPF area mismatch diagnosis under the separate requirement to recover adjacency on a link whose routers are configured in different areas. It does not demonstrate the needed OSPF interface cost control result: the SPF tree and installed next hop reflect the new cumulative cost.

The observation would verify BFD cross-protocol fast detection under the separate requirement to provide a common rapid link-failure signal to multiple supported routing protocols. It does not demonstrate the needed OSPF interface cost control result: the SPF tree and installed next hop reflect the new cumulative cost.

This defect belongs to OSPF hello dead timer mismatch, where the affected outcome is to repair a failed OSPF neighbor relationship caused by unequal hello or dead intervals. It is not the direct failure mode identified for the OSPF interface cost control design in this case: a local preference change is attempted even though only OSPF chooses the path.

This defect belongs to OSPF area mismatch diagnosis, where the affected outcome is to recover adjacency on a link whose routers are configured in different areas. It is not the direct failure mode identified for the OSPF interface cost control design in this case: a local preference change is attempted even though only OSPF chooses the path.

This defect belongs to BFD cross-protocol fast detection, where the affected outcome is to provide a common rapid link-failure signal to multiple supported routing protocols. It is not the direct failure mode identified for the OSPF interface cost control design in this case: a local preference change is attempted even though only OSPF chooses the path.

This concern applies to OSPF hello dead timer mismatch in a different scenario where operators need to repair a failed OSPF neighbor relationship caused by unequal hello or dead intervals. For the deployed OSPF interface cost control approach, the relevant caution is instead that all prefixes using the same OSPF route may change together.

This concern applies to OSPF area mismatch diagnosis in a different scenario where operators need to recover adjacency on a link whose routers are configured in different areas. For the deployed OSPF interface cost control approach, the relevant caution is instead that all prefixes using the same OSPF route may change together.

This concern applies to BFD cross-protocol fast detection in a different scenario where operators need to provide a common rapid link-failure signal to multiple supported routing protocols. For the deployed OSPF interface cost control approach, the relevant caution is instead that all prefixes using the same OSPF route may change together.

OSPF NSSA external translation instead addresses a different condition: allow controlled external-route origination inside an NSSA area. It would instead require you to configure NSSA behavior with appropriate Type-7 origination and translation at the border, not the stated goal to advertise an access subnet without accepting routing hellos from its subscribers.

controlled IGP to BGP redistribution instead addresses a different condition: inject only selected IGP routes into BGP at an authorized boundary. It would instead require you to redistribute through a narrow route-policy rather than all learned IGP prefixes, not the stated goal to advertise an access subnet without accepting routing hellos from its subscribers.

NSR control-plane failover instead addresses a different condition: preserve routing protocol state across a supported redundant control processor switchover. It would instead require you to enable and verify nonstop routing on eligible platform and protocol instances, not the stated goal to advertise an access subnet without accepting routing hellos from its subscribers.

The proposed step is for OSPF NSSA external translation, whose purpose is to allow controlled external-route origination inside an NSSA area. It would not perform the necessary OSPF passive customer subnet operation: configure the access interface as OSPF passive where appropriate.

The proposed step is for controlled IGP to BGP redistribution, whose purpose is to inject only selected IGP routes into BGP at an authorized boundary. It would not perform the necessary OSPF passive customer subnet operation: configure the access interface as OSPF passive where appropriate.

The proposed step is for NSR control-plane failover, whose purpose is to preserve routing protocol state across a supported redundant control processor switchover. It would not perform the necessary OSPF passive customer subnet operation: configure the access interface as OSPF passive where appropriate.

The observation would verify OSPF NSSA external translation under the separate requirement to allow controlled external-route origination inside an NSSA area. It does not demonstrate the needed OSPF passive customer subnet result: the subnet is advertised but no OSPF customer adjacency forms.

The observation would verify controlled IGP to BGP redistribution under the separate requirement to inject only selected IGP routes into BGP at an authorized boundary. It does not demonstrate the needed OSPF passive customer subnet result: the subnet is advertised but no OSPF customer adjacency forms.

The observation would verify NSR control-plane failover under the separate requirement to preserve routing protocol state across a supported redundant control processor switchover. It does not demonstrate the needed OSPF passive customer subnet result: the subnet is advertised but no OSPF customer adjacency forms.

This defect belongs to OSPF NSSA external translation, where the affected outcome is to allow controlled external-route origination inside an NSSA area. It is not the direct failure mode identified for the OSPF passive customer subnet design in this case: the access interface actively peers with an unauthorized CE router.

This defect belongs to controlled IGP to BGP redistribution, where the affected outcome is to inject only selected IGP routes into BGP at an authorized boundary. It is not the direct failure mode identified for the OSPF passive customer subnet design in this case: the access interface actively peers with an unauthorized CE router.

This defect belongs to NSR control-plane failover, where the affected outcome is to preserve routing protocol state across a supported redundant control processor switchover. It is not the direct failure mode identified for the OSPF passive customer subnet design in this case: the access interface actively peers with an unauthorized CE router.

This concern applies to OSPF NSSA external translation in a different scenario where operators need to allow controlled external-route origination inside an NSSA area. For the deployed OSPF passive customer subnet approach, the relevant caution is instead that a core-facing interface must not be made passive by mistake.

This concern applies to controlled IGP to BGP redistribution in a different scenario where operators need to inject only selected IGP routes into BGP at an authorized boundary. For the deployed OSPF passive customer subnet approach, the relevant caution is instead that a core-facing interface must not be made passive by mistake.

This concern applies to NSR control-plane failover in a different scenario where operators need to preserve routing protocol state across a supported redundant control processor switchover. For the deployed OSPF passive customer subnet approach, the relevant caution is instead that a core-facing interface must not be made passive by mistake.