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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.

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

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: check OSPFv3 interface area IDs and neighbor state until adjacency reaches Full.

This test measures a different behavior: Check area type, LSA database and default-route behavior for the selected stub model. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check OSPFv3 interface area IDs and neighbor state until adjacency reaches Full.

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: no OSPFv3 adjacency forms despite IPv6 link-local connectivity. The applicable cause is: the OSPFv3 interface area IDs are inconsistent between adjacent peers.

That diagnosis is supported by a different symptom: An operator rejects a valid OSPFv3 design because no global IPv6 address appears on the transit link. Here the recorded observation is: no OSPFv3 adjacency forms despite IPv6 link-local connectivity. The applicable cause is: the OSPFv3 interface area IDs are inconsistent between adjacent peers.

That diagnosis is supported by a different symptom: Intra-area reachability works but normal inter-area destinations are absent. Here the recorded observation is: no OSPFv3 adjacency forms despite IPv6 link-local connectivity. The applicable cause is: the OSPFv3 interface area IDs are inconsistent between adjacent peers.

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 OSPFv3 interface area IDs are inconsistent between adjacent peers. The specific required safeguard is: audit area and instance IDs during OSPFv3 deployment to additional links.

An ABR backbone connection does not fix adjacent OSPFv3 interfaces configured with different area assignments.

IPv6 link-local neighbor reachability is necessary for OSPFv3, but it does not reconcile the mismatched area IDs.

Assigning distinct stable router IDs and restart/clear the relevant OSPF process as required by the platform would not meet the need for the supported `always` option only when intentionally advertising default irrespective of a local installed default.

Applying the appropriate external redistribution route-map or prefix controls at the ASBR would not meet the need for the supported `always` option only when intentionally advertising default irrespective of a local installed default.

Making the LAN-facing OSPF interface passive while still advertising its connected prefix as appropriate would not meet the need for the supported `always` option only when intentionally advertising default irrespective of a local installed default.

This test measures a different behavior: Check `show ip ospf neighbor` transitions to Full and peer router IDs are unique. It does not establish the target outcome. For the documented fault, the direct acceptance test is: verify 0.0.0.0/0 external LSA presence and the upstream default route policy under failure tests.

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 0.0.0.0/0 external LSA presence and the upstream default route policy under failure tests.

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: verify 0.0.0.0/0 external LSA presence and the upstream default route policy under failure tests.

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: the default LSA disappears when the originating router loses its own RIB default route. The applicable cause is: without `always`, default origination depends on a default route being present in the advertising router.

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: the default LSA disappears when the originating router loses its own RIB default route. The applicable cause is: without `always`, default origination depends on a default route being present in the advertising router.

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: the default LSA disappears when the originating router loses its own RIB default route. The applicable cause is: without `always`, default origination depends on a default route being present in the advertising router.

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: without `always`, default origination depends on a default route being present in the advertising router. The specific required safeguard is: prevent blackhole risk by testing fallback/default origination and upstream viability.

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: without `always`, default origination depends on a default route being present in the advertising router. The specific required safeguard is: prevent blackhole risk by testing fallback/default origination and upstream viability.

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: without `always`, default origination depends on a default route being present in the advertising router. The specific required safeguard is: prevent blackhole risk by testing fallback/default origination and upstream viability.

Placing ASBR external routes in an area type that supports external LSAs or adjust area design deliberately would not apply the appropriate external redistribution route-map or prefix controls at the ASBR.

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

Making the LAN-facing OSPF interface passive while still advertising its connected prefix as appropriate would not apply the appropriate external redistribution route-map or prefix controls at the ASBR.

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

This test measures a different behavior: Check area type, LSA database and default-route behavior for the selected stub model. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect redistributed external LSAs and confirm prohibited prefixes are not originated.

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 redistributed external LSAs and confirm prohibited prefixes are not originated.

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: external prefixes still appear in OSPF despite a changed inter-area summary range. The applicable cause is: the area range controls inter-area summarization, not the ASBR's redistributed external LSA set.

That diagnosis is supported by a different symptom: Area0 contains dozens of separate intra-area destinations from area10 with no consolidated summary. Here the recorded observation is: external prefixes still appear in OSPF despite a changed inter-area summary range. The applicable cause is: the area range controls inter-area summarization, not the ASBR's redistributed external LSA set.

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: external prefixes still appear in OSPF despite a changed inter-area summary range. The applicable cause is: the area range controls inter-area summarization, not the ASBR's redistributed external LSA set.