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Restore prior supported OSPF interface parameters on the affected link while investigating incompatibility. This instead concerns ospf area and neighbor state. OSPF neighbors must agree on core adjacency properties; Ethernet link status and matching IP ranges alone are insufficient. It would not safely roll back the relevant failed change. The immediate problem concerns longest prefix match over route metric.

Revert erroneous passive settings on designated transit interfaces and retain passive protection on client VLANs. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It would not safely roll back the relevant failed change. The immediate problem concerns longest prefix match over route metric.

Restore the previous mutually valid authentication key under the change plan until coordinated rotation is complete. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not safely roll back the relevant failed change. The immediate problem concerns longest prefix match over route metric.

Review OSPF interface area, hello/dead timers, network type and neighbor state on both peers. This instead concerns ospf area and neighbor state. OSPF neighbors must agree on core adjacency properties; Ethernet link status and matching IP ranges alone are insufficient. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns longest prefix match over route metric.

Enforce passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns longest prefix match over route metric.

Match the intended OSPF area and compatible adjacency parameters without changing unrelated routing peers. This instead concerns ospf area and neighbor state. OSPF neighbors must agree on core adjacency properties; Ethernet link status and matching IP ranges alone are insufficient. It would not implement the specifically required change. The immediate problem concerns longest prefix match over route metric.

Enforce passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It would not implement the specifically required change. The immediate problem concerns longest prefix match over route metric.

Enforce matching approved OSPF authentication parameters and key rotation to both routing peers. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not implement the specifically required change. The immediate problem concerns longest prefix match over route metric.

Verify neighbor state reaches Full and the expected link-state advertisements and routes appear. This instead concerns ospf area and neighbor state. OSPF neighbors must agree on core adjacency properties; Ethernet link status and matching IP ranges alone are insufficient. It would not establish that this function actually works. The immediate problem concerns longest prefix match over route metric.

Confirm user VLANs are advertised as needed without OSPF hello adjacency attempts, while intended routed neighbors become Full. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It would not establish that this function actually works. The immediate problem concerns longest prefix match over route metric.

Confirm the OSPF neighbor rebuilds to Full with no new authentication failure events. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not establish that this function actually works. The immediate problem concerns longest prefix match over route metric.

Reinstate prior supported OSPF interface parameters on the affected link while investigating incompatibility. This instead concerns ospf area and neighbor state. OSPF neighbors must agree on core adjacency properties; Ethernet link status and matching IP ranges alone are insufficient. It would not safely roll back the relevant failed change. The immediate problem concerns longest prefix match over route metric.

Undo erroneous passive settings on designated transit interfaces and retain passive protection on client VLANs. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It would not safely roll back the relevant failed change. The immediate problem concerns longest prefix match over route metric.

Reinstate the previous mutually valid authentication key under the change plan until coordinated rotation is complete. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not safely roll back the relevant failed change. The immediate problem concerns longest prefix match over route metric.

Inspect OSPF passive-interface selection and whether a real routing neighbor is expected on that link. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It does not isolate the cause of the stated incident. The immediate problem concerns ospf area and neighbor state.

Inspect OSPF authentication mode, key IDs and error logs on both ends of the adjacency. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It does not isolate the cause of the stated incident. The immediate problem concerns ospf area and neighbor state.

Inspect redistribution policy, route tags, imported prefix filters and the resulting external LSA path. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It does not isolate the cause of the stated incident. The immediate problem concerns ospf area and neighbor state.

Apply passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It would not implement the specifically required change. The immediate problem concerns ospf area and neighbor state.

Apply matching approved OSPF authentication parameters and key rotation to both routing peers. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not implement the specifically required change. The immediate problem concerns ospf area and neighbor state.

Limit redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not implement the specifically required change. The immediate problem concerns ospf area and neighbor state.

Verify user VLANs are advertised as needed without OSPF hello adjacency attempts, while intended routed neighbors become Full. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It would not establish that this function actually works. The immediate problem concerns ospf area and neighbor state.

Verify the OSPF neighbor rebuilds to Full with no new authentication failure events. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not establish that this function actually works. The immediate problem concerns ospf area and neighbor state.

Verify only authorized external routes are advertised and preferred next hops remain stable at a remote peer. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not establish that this function actually works. The immediate problem concerns ospf area and neighbor state.

Revert erroneous passive settings on designated transit interfaces and retain passive protection on client VLANs. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It would not safely roll back the relevant failed change. The immediate problem concerns ospf area and neighbor state.

Restore the previous mutually valid authentication key under the change plan until coordinated rotation is complete. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not safely roll back the relevant failed change. The immediate problem concerns ospf area and neighbor state.

Withdraw the offending external advertisement and restore the prior filtered redistribution policy. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not safely roll back the relevant failed change. The immediate problem concerns ospf area and neighbor state.

Review OSPF passive-interface selection and whether a real routing neighbor is expected on that link. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It does not isolate the cause of the stated incident. The immediate problem concerns ospf area and neighbor state.

Review OSPF authentication mode, key IDs and error logs on both ends of the adjacency. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It does not isolate the cause of the stated incident. The immediate problem concerns ospf area and neighbor state.

Review redistribution policy, route tags, imported prefix filters and the resulting external LSA path. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It does not isolate the cause of the stated incident. The immediate problem concerns ospf area and neighbor state.

Enforce passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It would not implement the specifically required change. The immediate problem concerns ospf area and neighbor state.

Enforce matching approved OSPF authentication parameters and key rotation to both routing peers. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not implement the specifically required change. The immediate problem concerns ospf area and neighbor state.

Constrain redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not implement the specifically required change. The immediate problem concerns ospf area and neighbor state.