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This concern applies to IS-IS single-topology coexistence in a different scenario where operators need to run IPv4 and IPv6 under a common IS-IS topology when links support both. For the deployed IS-IS authentication mismatch approach, the relevant caution is instead that key rotation requires overlapping operational coordination at both peers.

This concern applies to graceful restart helper coordination in a different scenario where operators need to allow a neighbor's control-plane restart without immediately invalidating forwarding. For the deployed IS-IS authentication mismatch approach, the relevant caution is instead that key rotation requires overlapping operational coordination at both peers.

This concern applies to BGP remote AS alignment in a different scenario where operators need to form an external BGP peering between provider and customer autonomous systems. For the deployed IS-IS authentication mismatch approach, the relevant caution is instead that key rotation requires overlapping operational coordination at both peers.

IS-IS level-1 local-area reachability instead addresses a different condition: keep IS-IS routes within an area while preserving local Level-1 forwarding. It would instead require you to configure Level-1 operation and matching area identifiers for those routers, not the stated goal to advertise a customer-facing subnet without creating an unintended routing peer.

OSPF duplicate router identity instead addresses a different condition: resolve unstable OSPF database state caused by two routers sharing a router ID. It would instead require you to assign unique router IDs and restore the affected adjacencies, not the stated goal to advertise a customer-facing subnet without creating an unintended routing peer.

BGP AS-path prepending instead addresses a different condition: make one advertised path less attractive to neighboring autonomous systems. It would instead require you to prepend a suitable number of the advertising AS in the outbound AS path, not the stated goal to advertise a customer-facing subnet without creating an unintended routing peer.

The proposed step is for IS-IS level-1 local-area reachability, whose purpose is to keep IS-IS routes within an area while preserving local Level-1 forwarding. It would not perform the necessary IS-IS passive interface design operation: make the relevant interface passive while retaining required subnet advertisement.

The proposed step is for OSPF duplicate router identity, whose purpose is to resolve unstable OSPF database state caused by two routers sharing a router ID. It would not perform the necessary IS-IS passive interface design operation: make the relevant interface passive while retaining required subnet advertisement.

The proposed step is for BGP AS-path prepending, whose purpose is to make one advertised path less attractive to neighboring autonomous systems. It would not perform the necessary IS-IS passive interface design operation: make the relevant interface passive while retaining required subnet advertisement.

The observation would verify IS-IS level-1 local-area reachability under the separate requirement to keep IS-IS routes within an area while preserving local Level-1 forwarding. It does not demonstrate the needed IS-IS passive interface design result: the subnet remains reachable and no neighbor adjacency forms on that access port.

The observation would verify OSPF duplicate router identity under the separate requirement to resolve unstable OSPF database state caused by two routers sharing a router ID. It does not demonstrate the needed IS-IS passive interface design result: the subnet remains reachable and no neighbor adjacency forms on that access port.

The observation would verify BGP AS-path prepending under the separate requirement to make one advertised path less attractive to neighboring autonomous systems. It does not demonstrate the needed IS-IS passive interface design result: the subnet remains reachable and no neighbor adjacency forms on that access port.

This defect belongs to IS-IS level-1 local-area reachability, where the affected outcome is to keep IS-IS routes within an area while preserving local Level-1 forwarding. It is not the direct failure mode identified for the IS-IS passive interface design design in this case: hello packets still create adjacency with an untrusted customer router.

This defect belongs to OSPF duplicate router identity, where the affected outcome is to resolve unstable OSPF database state caused by two routers sharing a router ID. It is not the direct failure mode identified for the IS-IS passive interface design design in this case: hello packets still create adjacency with an untrusted customer router.

This defect belongs to BGP AS-path prepending, where the affected outcome is to make one advertised path less attractive to neighboring autonomous systems. It is not the direct failure mode identified for the IS-IS passive interface design design in this case: hello packets still create adjacency with an untrusted customer router.

This concern applies to IS-IS level-1 local-area reachability in a different scenario where operators need to keep IS-IS routes within an area while preserving local Level-1 forwarding. For the deployed IS-IS passive interface design approach, the relevant caution is instead that passive treatment must not be applied to a link needed for core routing.

This concern applies to OSPF duplicate router identity in a different scenario where operators need to resolve unstable OSPF database state caused by two routers sharing a router ID. For the deployed IS-IS passive interface design approach, the relevant caution is instead that passive treatment must not be applied to a link needed for core routing.

This concern applies to BGP AS-path prepending in a different scenario where operators need to make one advertised path less attractive to neighboring autonomous systems. For the deployed IS-IS passive interface design approach, the relevant caution is instead that passive treatment must not be applied to a link needed for core routing.

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 carry a newly connected backbone subnet in the correct IS-IS address family.

BGP max-prefix protection instead addresses a different condition: protect a provider edge from a customer's sudden route-table explosion. It would instead require you to configure an appropriate maximum-prefix threshold and response for the neighbor, not the stated goal to carry a newly connected backbone subnet in the correct IS-IS address family.

BGP next-hop-self internal reachability instead addresses a different condition: repair iBGP route reception when the external next hop cannot be resolved internally. It would instead require you to set the correct next-hop attribute on the iBGP advertisement boundary, not the stated goal to carry a newly connected backbone subnet in the correct IS-IS address family.

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 IS-IS IPv4 route advertisement operation: enable IPv4 unicast participation on the routing instance and intended interface.

The proposed step is for BGP max-prefix protection, whose purpose is to protect a provider edge from a customer's sudden route-table explosion. It would not perform the necessary IS-IS IPv4 route advertisement operation: enable IPv4 unicast participation on the routing instance and intended interface.

The proposed step is for BGP next-hop-self internal reachability, whose purpose is to repair iBGP route reception when the external next hop cannot be resolved internally. It would not perform the necessary IS-IS IPv4 route advertisement operation: enable IPv4 unicast participation on the routing instance and intended interface.

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 IS-IS IPv4 route advertisement result: the subnet is present in the correct link-state and routing databases.

The observation would verify BGP max-prefix protection under the separate requirement to protect a provider edge from a customer's sudden route-table explosion. It does not demonstrate the needed IS-IS IPv4 route advertisement result: the subnet is present in the correct link-state and routing databases.

The observation would verify BGP next-hop-self internal reachability under the separate requirement to repair iBGP route reception when the external next hop cannot be resolved internally. It does not demonstrate the needed IS-IS IPv4 route advertisement result: the subnet is present in the correct link-state and routing databases.

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 IS-IS IPv4 route advertisement design in this case: the interface runs only an IPv6 address family although an IPv4 route is needed.

This defect belongs to BGP max-prefix protection, where the affected outcome is to protect a provider edge from a customer's sudden route-table explosion. It is not the direct failure mode identified for the IS-IS IPv4 route advertisement design in this case: the interface runs only an IPv6 address family although an IPv4 route is needed.

This defect belongs to BGP next-hop-self internal reachability, where the affected outcome is to repair iBGP route reception when the external next hop cannot be resolved internally. It is not the direct failure mode identified for the IS-IS IPv4 route advertisement design in this case: the interface runs only an IPv6 address family although an IPv4 route is needed.

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 IS-IS IPv4 route advertisement approach, the relevant caution is instead that the advertising router must have a valid corresponding connected prefix.

This concern applies to BGP max-prefix protection in a different scenario where operators need to protect a provider edge from a customer's sudden route-table explosion. For the deployed IS-IS IPv4 route advertisement approach, the relevant caution is instead that the advertising router must have a valid corresponding connected prefix.

This concern applies to BGP next-hop-self internal reachability in a different scenario where operators need to repair iBGP route reception when the external next hop cannot be resolved internally. For the deployed IS-IS IPv4 route advertisement approach, the relevant caution is instead that the advertising router must have a valid corresponding connected prefix.