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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 stub area constraint approach, the relevant caution is instead that a stub area cannot independently host an ordinary ASBR advertising externals.

This concern applies to IS-IS metric traffic engineering in a different scenario where operators need to prefer a lower-cost IGP path without changing BGP administrative preferences. For the deployed OSPF stub area constraint approach, the relevant caution is instead that a stub area cannot independently host an ordinary ASBR advertising externals.

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 stub area constraint approach, the relevant caution is instead that a stub area cannot independently host an ordinary ASBR advertising externals.

OSPF passive customer subnet instead addresses a different condition: advertise an access subnet without accepting routing hellos from its subscribers. It would instead require you to configure the access interface as OSPF passive where appropriate, not the stated goal to allow controlled external-route origination inside an NSSA area.

BGP community tagging policy instead addresses a different condition: identify a class of routes consistently across multiple policy boundaries. It would instead require you to attach a defined BGP community and match it at the intended next policy point, not the stated goal to allow controlled external-route origination inside an NSSA area.

IS-IS level-2 backbone exchange instead addresses a different condition: connect two IS-IS areas through a common Level-2 routing backbone. It would instead require you to form Level-2 adjacencies across area-border routers and advertise reachability, not the stated goal to allow controlled external-route origination inside an NSSA area.

The proposed step is for OSPF passive customer subnet, whose purpose is to advertise an access subnet without accepting routing hellos from its subscribers. It would not perform the necessary OSPF NSSA external translation operation: configure NSSA behavior with appropriate Type-7 origination and translation at the border.

The proposed step is for BGP community tagging policy, whose purpose is to identify a class of routes consistently across multiple policy boundaries. It would not perform the necessary OSPF NSSA external translation operation: configure NSSA behavior with appropriate Type-7 origination and translation at the border.

The proposed step is for IS-IS level-2 backbone exchange, whose purpose is to connect two IS-IS areas through a common Level-2 routing backbone. It would not perform the necessary OSPF NSSA external translation operation: configure NSSA behavior with appropriate Type-7 origination and translation at the border.

The observation would verify OSPF passive customer subnet under the separate requirement to advertise an access subnet without accepting routing hellos from its subscribers. It does not demonstrate the needed OSPF NSSA external translation result: NSSA-originated routes are visible as correct Type-7 and translated external reachability.

The observation would verify BGP community tagging policy under the separate requirement to identify a class of routes consistently across multiple policy boundaries. It does not demonstrate the needed OSPF NSSA external translation result: NSSA-originated routes are visible as correct Type-7 and translated external reachability.

The observation would verify IS-IS level-2 backbone exchange under the separate requirement to connect two IS-IS areas through a common Level-2 routing backbone. It does not demonstrate the needed OSPF NSSA external translation result: NSSA-originated routes are visible as correct Type-7 and translated external reachability.

This defect belongs to OSPF passive customer subnet, where the affected outcome is to advertise an access subnet without accepting routing hellos from its subscribers. It is not the direct failure mode identified for the OSPF NSSA external translation design in this case: an ordinary stub area is configured where external injection is required.

This defect belongs to BGP community tagging policy, where the affected outcome is to identify a class of routes consistently across multiple policy boundaries. It is not the direct failure mode identified for the OSPF NSSA external translation design in this case: an ordinary stub area is configured where external injection is required.

This defect belongs to IS-IS level-2 backbone exchange, where the affected outcome is to connect two IS-IS areas through a common Level-2 routing backbone. It is not the direct failure mode identified for the OSPF NSSA external translation design in this case: an ordinary stub area is configured where external injection is required.

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 NSSA external translation approach, the relevant caution is instead that Type-7 translation and default-route policy must be planned at the ABR.

This concern applies to BGP community tagging policy in a different scenario where operators need to identify a class of routes consistently across multiple policy boundaries. For the deployed OSPF NSSA external translation approach, the relevant caution is instead that Type-7 translation and default-route policy must be planned at the ABR.

This concern applies to IS-IS level-2 backbone exchange in a different scenario where operators need to connect two IS-IS areas through a common Level-2 routing backbone. For the deployed OSPF NSSA external translation approach, the relevant caution is instead that Type-7 translation and default-route policy must be planned at the ABR.

OSPF passive customer subnet instead addresses a different condition: advertise an access subnet without accepting routing hellos from its subscribers. It would instead require you to configure the access interface as OSPF passive where appropriate, not the stated goal to reduce adjacency overhead on a shared broadcast Ethernet segment.

BGP neighbor TCP authentication instead addresses a different condition: ensure an external BGP session establishes only with peers possessing the agreed session authentication material. It would instead require you to configure supported matching BGP neighbor TCP authentication credentials at both peers, not the stated goal to reduce adjacency overhead on a shared broadcast Ethernet segment.

IS-IS NET system identity instead addresses a different condition: ensure two routers in the same IS-IS domain have distinct system identifiers. It would instead require you to assign each instance a unique six-octet system ID in its network entity title, not the stated goal to reduce adjacency overhead on a shared broadcast Ethernet segment.

The proposed step is for OSPF passive customer subnet, whose purpose is to advertise an access subnet without accepting routing hellos from its subscribers. It would not perform the necessary OSPF designated router election operation: choose OSPF network type and DR priorities intentionally on the multiaccess network.

The proposed step is for BGP neighbor TCP authentication, whose purpose is to ensure an external BGP session establishes only with peers possessing the agreed session authentication material. It would not perform the necessary OSPF designated router election operation: choose OSPF network type and DR priorities intentionally on the multiaccess network.

The proposed step is for IS-IS NET system identity, whose purpose is to ensure two routers in the same IS-IS domain have distinct system identifiers. It would not perform the necessary OSPF designated router election operation: choose OSPF network type and DR priorities intentionally on the multiaccess network.

The observation would verify OSPF passive customer subnet under the separate requirement to advertise an access subnet without accepting routing hellos from its subscribers. It does not demonstrate the needed OSPF designated router election result: the intended DR and BDR appear in OSPF neighbor and interface status.

The observation would verify BGP neighbor TCP authentication under the separate requirement to ensure an external BGP session establishes only with peers possessing the agreed session authentication material. It does not demonstrate the needed OSPF designated router election result: the intended DR and BDR appear in OSPF neighbor and interface status.

The observation would verify IS-IS NET system identity under the separate requirement to ensure two routers in the same IS-IS domain have distinct system identifiers. It does not demonstrate the needed OSPF designated router election result: the intended DR and BDR appear in OSPF neighbor and interface status.

This defect belongs to OSPF passive customer subnet, where the affected outcome is to advertise an access subnet without accepting routing hellos from its subscribers. It is not the direct failure mode identified for the OSPF designated router election design in this case: point-to-point behavior is assumed for a many-router Ethernet network.

This defect belongs to BGP neighbor TCP authentication, where the affected outcome is to ensure an external BGP session establishes only with peers possessing the agreed session authentication material. It is not the direct failure mode identified for the OSPF designated router election design in this case: point-to-point behavior is assumed for a many-router Ethernet network.

This defect belongs to IS-IS NET system identity, where the affected outcome is to ensure two routers in the same IS-IS domain have distinct system identifiers. It is not the direct failure mode identified for the OSPF designated router election design in this case: point-to-point behavior is assumed for a many-router Ethernet network.

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.