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That diagnosis is supported by a different symptom: OSPF adjacency fails or behaves inconsistently when duplicate router IDs are present. Here the recorded observation is: a two-router point-to-point link unexpectedly elects a DR and follows broadcast-style adjacency rules. The applicable cause is: the OSPF network type is set to broadcast instead of point-to-point.

That diagnosis is supported by a different symptom: Two DROthers remain in 2-Way even though the network is forwarding routes normally. Here the recorded observation is: a two-router point-to-point link unexpectedly elects a DR and follows broadcast-style adjacency rules. The applicable cause is: the OSPF network type is set to broadcast instead of point-to-point.

That diagnosis is supported by a different symptom: External routes are absent inside the stub despite a working internal adjacency. Here the recorded observation is: a two-router point-to-point link unexpectedly elects a DR and follows broadcast-style adjacency rules. The applicable cause is: the OSPF network type is set to broadcast instead of point-to-point.

That control reduces a separate risk: Stub areas suppress Type 5 external LSAs; the expectation of normal external flooding was wrong. For the described design, the recurring risk arises from: the OSPF network type is set to broadcast instead of point-to-point. The specific required safeguard is: standardize OSPF network types and timer matching on dedicated routed links.

That control reduces a separate risk: The OSPF domain does not have unique router identifiers for participating routers. For the described design, the recurring risk arises from: the OSPF network type is set to broadcast instead of point-to-point. The specific required safeguard is: standardize OSPF network types and timer matching on dedicated routed links.

That control reduces a separate risk: The DR/BDR adjacency topology intentionally avoids full DROther-to-DROther adjacencies. For the described design, the recurring risk arises from: the OSPF network type is set to broadcast instead of point-to-point. The specific required safeguard is: standardize OSPF network types and timer matching on dedicated routed links.

Applying the appropriate external redistribution route-map or prefix controls at the ASBR would not configure supported inter-area `area 10 range` summarization on the ABR with the intended prefix boundary.

Placing the connected OSPFv3 interfaces into the same intended area, maintaining valid process and instance alignment would not configure supported inter-area `area 10 range` summarization on the ABR with the intended prefix boundary.

Ensuring the ABR connects the normal area to area0 through supported backbone topology would not configure supported inter-area `area 10 range` summarization on the ABR with the intended prefix boundary.

This test measures a different behavior: Inspect ABR LSAs and inter-area route presence from area10 toward area0 destinations. It does not establish the target outcome. For the documented fault, the direct acceptance test is: verify external areas learn the summary and the specific component prefixes remain within area10.

This test measures a different behavior: Check OSPFv3 interface area IDs and neighbor state until adjacency reaches Full. It does not establish the target outcome. For the documented fault, the direct acceptance test is: verify external areas learn the summary and the specific component prefixes remain within area10.

This test measures a different behavior: Inspect redistributed external LSAs and confirm prohibited prefixes are not originated. It does not establish the target outcome. For the documented fault, the direct acceptance test is: verify external areas learn the summary and the specific component prefixes remain within area10.

That diagnosis is supported by a different symptom: No OSPFv3 adjacency forms despite IPv6 link-local connectivity. Here the recorded observation is: area0 contains dozens of separate intra-area destinations from area10 with no consolidated summary. The applicable cause is: the ABR has no correctly scoped inter-area summary range for the advertised prefixes.

That diagnosis is supported by a different symptom: Intra-area reachability works but normal inter-area destinations are absent. Here the recorded observation is: area0 contains dozens of separate intra-area destinations from area10 with no consolidated summary. The applicable cause is: the ABR has no correctly scoped inter-area summary range for the advertised prefixes.

That diagnosis is supported by a different symptom: External prefixes still appear in OSPF despite a changed inter-area summary range. Here the recorded observation is: area0 contains dozens of separate intra-area destinations from area10 with no consolidated summary. The applicable cause is: the ABR has no correctly scoped inter-area summary range for the advertised prefixes.

That control reduces a separate risk: The area range controls inter-area summarization, not the ASBR's redistributed external LSA set. For the described design, the recurring risk arises from: the ABR has no correctly scoped inter-area summary range for the advertised prefixes. The specific required safeguard is: review summary boundaries to avoid blackholing addresses in unused holes.

That control reduces a separate risk: Area10 is not connected to a valid backbone path for inter-area routing. For the described design, the recurring risk arises from: the ABR has no correctly scoped inter-area summary range for the advertised prefixes. The specific required safeguard is: review summary boundaries to avoid blackholing addresses in unused holes.

That control reduces a separate risk: The OSPFv3 interface area IDs are inconsistent between adjacent peers. For the described design, the recurring risk arises from: the ABR has no correctly scoped inter-area summary range for the advertised prefixes. The specific required safeguard is: review summary boundaries to avoid blackholing addresses in unused holes.

Placing the connected OSPFv3 interfaces into the same intended area, maintaining valid process and instance alignment would not enable supported OSPFv3 IPv6 routing and adjacencies using IPv6 link-local neighbor reachability.

Configuring the appropriate OSPF point-to-point network type on the dedicated link would not enable supported OSPFv3 IPv6 routing and adjacencies using IPv6 link-local neighbor reachability.

Making the LAN-facing OSPF interface passive while still advertising its connected prefix as appropriate would not enable supported OSPFv3 IPv6 routing and adjacencies using IPv6 link-local neighbor reachability.

This test measures a different behavior: Verify no DR/BDR election and the peer reaches Full on the point-to-point interface. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect OSPFv3 neighbors and IPv6 link-local next hops on the interface.

This test measures a different behavior: Check OSPFv3 interface area IDs and neighbor state until adjacency reaches Full. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect OSPFv3 neighbors and IPv6 link-local next hops on the interface.

This test measures a different behavior: Inspect OSPF interface/passive state and verify no LAN neighbor adjacencies form. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect OSPFv3 neighbors and IPv6 link-local next hops on the interface.

That diagnosis is supported by a different symptom: A two-router point-to-point link unexpectedly elects a DR and follows broadcast-style adjacency rules. Here the recorded observation is: an operator rejects a valid OSPFv3 design because no global IPv6 address appears on the transit link. The applicable cause is: oSPFv3 neighbor formation uses link-local addressing on the link, not a required global neighbor address.

That diagnosis is supported by a different symptom: Untrusted LAN hosts receive OSPF Hellos and can attempt to form adjacencies. Here the recorded observation is: an operator rejects a valid OSPFv3 design because no global IPv6 address appears on the transit link. The applicable cause is: oSPFv3 neighbor formation uses link-local addressing on the link, not a required global neighbor address.

That diagnosis is supported by a different symptom: No OSPFv3 adjacency forms despite IPv6 link-local connectivity. Here the recorded observation is: an operator rejects a valid OSPFv3 design because no global IPv6 address appears on the transit link. The applicable cause is: oSPFv3 neighbor formation uses link-local addressing on the link, not a required global neighbor address.

That control reduces a separate risk: The user-facing interface is active for OSPF neighbor discovery instead of passive. For the described design, the recurring risk arises from: oSPFv3 neighbor formation uses link-local addressing on the link, not a required global neighbor address. The specific required safeguard is: verify IPv6 link-local reachability and per-interface OSPFv3 process/area bindings.

That control reduces a separate risk: The OSPFv3 interface area IDs are inconsistent between adjacent peers. For the described design, the recurring risk arises from: oSPFv3 neighbor formation uses link-local addressing on the link, not a required global neighbor address. The specific required safeguard is: verify IPv6 link-local reachability and per-interface OSPFv3 process/area bindings.

That control reduces a separate risk: The OSPF network type is set to broadcast instead of point-to-point. For the described design, the recurring risk arises from: oSPFv3 neighbor formation uses link-local addressing on the link, not a required global neighbor address. The specific required safeguard is: verify IPv6 link-local reachability and per-interface OSPFv3 process/area bindings.

Enabling supported OSPFv3 IPv6 routing and adjacencies using IPv6 link-local neighbor reachability would not place the connected OSPFv3 interfaces into the same intended area, maintaining valid process and instance alignment.

Ensuring the ABR connects the normal area to area0 through supported backbone topology would not place the connected OSPFv3 interfaces into the same intended area, maintaining valid process and instance alignment.

Placing ASBR external routes in an area type that supports external LSAs or adjust area design deliberately would not place the connected OSPFv3 interfaces into the same intended area, maintaining valid process and instance alignment.