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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.

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 resolve unstable OSPF database state caused by two routers sharing a router ID.

IS-IS authentication mismatch instead addresses a different condition: recover an adjacency rejecting hello PDUs due to authentication differences. It would instead require you to correct matching IS-IS authentication method and keys for both ends, not the stated goal to resolve unstable OSPF database state caused by two routers sharing a router ID.

BGP prefix filtering instead addresses a different condition: stop a customer's accidental broad route advertisement at the provider ingress. It would instead require you to attach a prefix-set based inbound routing policy with exact allowed subnets, not the stated goal to resolve unstable OSPF database state caused by two routers sharing a router ID.

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 duplicate router identity operation: assign unique router IDs and restore the affected adjacencies.

The proposed step is for IS-IS authentication mismatch, whose purpose is to recover an adjacency rejecting hello PDUs due to authentication differences. It would not perform the necessary OSPF duplicate router identity operation: assign unique router IDs and restore the affected adjacencies.

The proposed step is for BGP prefix filtering, whose purpose is to stop a customer's accidental broad route advertisement at the provider ingress. It would not perform the necessary OSPF duplicate router identity operation: assign unique router IDs and restore the affected adjacencies.

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 duplicate router identity result: each router originates unambiguous LSAs and neighbor state stabilizes.

The observation would verify IS-IS authentication mismatch under the separate requirement to recover an adjacency rejecting hello PDUs due to authentication differences. It does not demonstrate the needed OSPF duplicate router identity result: each router originates unambiguous LSAs and neighbor state stabilizes.

The observation would verify BGP prefix filtering under the separate requirement to stop a customer's accidental broad route advertisement at the provider ingress. It does not demonstrate the needed OSPF duplicate router identity result: each router originates unambiguous LSAs and neighbor state stabilizes.

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 duplicate router identity design in this case: IP packet MTU changes are made while router IDs still conflict.

This defect belongs to IS-IS authentication mismatch, where the affected outcome is to recover an adjacency rejecting hello PDUs due to authentication differences. It is not the direct failure mode identified for the OSPF duplicate router identity design in this case: IP packet MTU changes are made while router IDs still conflict.

This defect belongs to BGP prefix filtering, where the affected outcome is to stop a customer's accidental broad route advertisement at the provider ingress. It is not the direct failure mode identified for the OSPF duplicate router identity design in this case: IP packet MTU changes are made while router IDs still conflict.

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 duplicate router identity approach, the relevant caution is instead that router ID changes can require process restart or adjacency reformation.

This concern applies to IS-IS authentication mismatch in a different scenario where operators need to recover an adjacency rejecting hello PDUs due to authentication differences. For the deployed OSPF duplicate router identity approach, the relevant caution is instead that router ID changes can require process restart or adjacency reformation.

This concern applies to BGP prefix filtering in a different scenario where operators need to stop a customer's accidental broad route advertisement at the provider ingress. For the deployed OSPF duplicate router identity approach, the relevant caution is instead that router ID changes can require process restart or adjacency reformation.

OSPF interface cost control instead addresses a different condition: favor a specific provider link with shorter calculated OSPF path cost. It would instead require you to set an appropriate OSPF interface cost rather than changing BGP policy, not the stated goal to reduce inter-area LSA volume for contiguous customer prefixes.

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 reduce inter-area LSA volume for contiguous customer prefixes.

CGNAT address sharing logging instead addresses a different condition: serve multiple IPv4 subscribers from shared public address resources. It would instead require you to deploy stateful carrier-grade NAT with accurate address-port allocation logging, not the stated goal to reduce inter-area LSA volume for contiguous customer prefixes.

The proposed step is for OSPF interface cost control, whose purpose is to favor a specific provider link with shorter calculated OSPF path cost. It would not perform the necessary OSPF route summarization operation: advertise an appropriate summary at the area boundary.

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 route summarization operation: advertise an appropriate summary at the area boundary.

The proposed step is for CGNAT address sharing logging, whose purpose is to serve multiple IPv4 subscribers from shared public address resources. It would not perform the necessary OSPF route summarization operation: advertise an appropriate summary at the area boundary.

The observation would verify OSPF interface cost control under the separate requirement to favor a specific provider link with shorter calculated OSPF path cost. It does not demonstrate the needed OSPF route summarization result: the backbone sees the intended aggregate while detail remains within the area.

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 route summarization result: the backbone sees the intended aggregate while detail remains within the area.

The observation would verify CGNAT address sharing logging under the separate requirement to serve multiple IPv4 subscribers from shared public address resources. It does not demonstrate the needed OSPF route summarization result: the backbone sees the intended aggregate while detail remains within the area.

This defect belongs to OSPF interface cost control, where the affected outcome is to favor a specific provider link with shorter calculated OSPF path cost. It is not the direct failure mode identified for the OSPF route summarization design in this case: individual unrelated prefixes are redistributed without summary control.

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 route summarization design in this case: individual unrelated prefixes are redistributed without summary control.

This defect belongs to CGNAT address sharing logging, where the affected outcome is to serve multiple IPv4 subscribers from shared public address resources. It is not the direct failure mode identified for the OSPF route summarization design in this case: individual unrelated prefixes are redistributed without summary control.

This concern applies to OSPF interface cost control in a different scenario where operators need to favor a specific provider link with shorter calculated OSPF path cost. For the deployed OSPF route summarization approach, the relevant caution is instead that bad summaries can blackhole destinations absent from the actual aggregate.

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 route summarization approach, the relevant caution is instead that bad summaries can blackhole destinations absent from the actual aggregate.

This concern applies to CGNAT address sharing logging in a different scenario where operators need to serve multiple IPv4 subscribers from shared public address resources. For the deployed OSPF route summarization approach, the relevant caution is instead that bad summaries can blackhole destinations absent from the actual aggregate.