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DR changes only as defined by normal election or controlled topology events is relevant to the different engineering topic "OSPF DR/BDR priority election", but it is not the most directly supported operational verification evidence for this precise case: A route unexpectedly selects a low-bandwidth core circuit. the best answer here is: The route resolves over the least-cost eligible topology.

The new DR represents the attached routers after convergence is relevant to the different engineering topic "Network-LSA type-two interpretation", but it is not the most directly supported operational verification evidence for this precise case: A route unexpectedly selects a low-bandwidth core circuit. the best answer here is: The route resolves over the least-cost eligible topology.

That option concerns Aggregated-Ethernet minimum links. OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.

That option concerns BPDU visibility on trunks. A passive OSPF interface can advertise its associated route without sending adjacency hellos; export policy controls external route advertisements.

Use OSPF neighbor, interface, database and route views to localize control-plane or policy failures is relevant to the different engineering topic "OSPF operational troubleshooting", but it is not the most directly supported technical design or decision for this precise case: A PE should advertise a local loopback to OSPF without neighbor discovery on the loopback. the best answer here is: Advertise intended connected prefixes without forming unwanted OSPF neighbors on customer-facing interfaces.

Use interface priority and election behavior correctly when designing an OSPF broadcast segment is relevant to the different engineering topic "OSPF DR/BDR priority election", but it is not the most directly supported technical design or decision for this precise case: A PE should advertise a local loopback to OSPF without neighbor discovery on the loopback. the best answer here is: Advertise intended connected prefixes without forming unwanted OSPF neighbors on customer-facing interfaces.

Check the DR/BDR roles and whether both maintain Full adjacency to the DR set is relevant to the different engineering topic "OSPF two-way versus full neighbors", but it is not the most directly supported implementation and troubleshooting step for this precise case: A PE should advertise a local loopback to OSPF without neighbor discovery on the loopback. the best answer here is: Configure the loopback interface as passive under the proper area.

That option concerns Network-LSA type-two interpretation. A passive OSPF interface can advertise its associated route without sending adjacency hellos; export policy controls external route advertisements.

That option concerns MPLS end-to-end troubleshooting. A passive OSPF interface can advertise its associated route without sending adjacency hellos; export policy controls external route advertisements.

That option concerns IPv6 link-local next-hop scope. A passive OSPF interface can advertise its associated route without sending adjacency hellos; export policy controls external route advertisements.

That option concerns OSPF interface network type, not the requirement in this case.

That option concerns OSPF hello/dead agreement. A passive OSPF interface can advertise its associated route without sending adjacency hellos; export policy controls external route advertisements.

Use OSPF neighbor, interface, database and route views to localize control-plane or policy failures is relevant to the different engineering topic "OSPF operational troubleshooting", but it is not the most directly supported technical design or decision for this precise case: An external static prefix is missing from OSPF advertisements. the best answer here is: Advertise intended connected prefixes without forming unwanted OSPF neighbors on customer-facing interfaces.

Place interfaces in the correct OSPF area and maintain intended backbone connectivity is relevant to the different engineering topic "OSPF backbone membership", but it is not the most directly supported technical design or decision for this precise case: An external static prefix is missing from OSPF advertisements. the best answer here is: Advertise intended connected prefixes without forming unwanted OSPF neighbors on customer-facing interfaces.

That option concerns MSTP region consistency. A passive OSPF interface can advertise its associated route without sending adjacency hellos; export policy controls external route advertisements.

That option concerns Segment-routing MPLS prefix SIDs. A passive OSPF interface can advertise its associated route without sending adjacency hellos; export policy controls external route advertisements.

Understand nonpreemptive election behavior before scheduling a reset is relevant to the different engineering topic "OSPF DR/BDR priority election", but it is not the most directly supported implementation and troubleshooting step for this precise case: An external static prefix is missing from OSPF advertisements. the best answer here is: Inspect export policy and route eligibility before moving it to another area.

Inspect configured ID and process restart requirements is relevant to the different engineering topic "OSPF router-ID uniqueness", but it is not the most directly supported implementation and troubleshooting step for this precise case: An external static prefix is missing from OSPF advertisements. the best answer here is: Inspect export policy and route eligibility before moving it to another area.

DR changes only as defined by normal election or controlled topology events is relevant to the different engineering topic "OSPF DR/BDR priority election", but it is not the most directly supported operational verification evidence for this precise case: An external static prefix is missing from OSPF advertisements. the best answer here is: Only explicitly approved external routes are advertised.

The adjacency reaches Full after resolving the actual mismatch is relevant to the different engineering topic "OSPF two-way versus full neighbors", but it is not the most directly supported operational verification evidence for this precise case: An external static prefix is missing from OSPF advertisements. the best answer here is: Only explicitly approved external routes are advertised.

That option concerns BFD rapid failure detection. A passive OSPF interface can advertise its associated route without sending adjacency hellos; export policy controls external route advertisements.

That option concerns Router-LSA type-one interpretation. Different Junos show ospf commands reveal different stages of the adjacency-to-route pipeline.

That option concerns OSPF interface metric selection. Different Junos show ospf commands reveal different stages of the adjacency-to-route pipeline.

That option concerns IPv6 static route next hop. Different Junos show ospf commands reveal different stages of the adjacency-to-route pipeline.

That option concerns OSPF passive-interface and export policy. Different Junos show ospf commands reveal different stages of the adjacency-to-route pipeline.

Compare supported hello and dead intervals and interface state is relevant to the different engineering topic "OSPF hello/dead agreement", but it is not the most directly supported implementation and troubleshooting step for this precise case: A core router sees neighbor state Full but no expected internal prefix. the best answer here is: Check show ospf database then show route protocol ospf.

That option concerns BPDU protection for edge ports. Different Junos show ospf commands reveal different stages of the adjacency-to-route pipeline.

The core neighbor becomes adjacent and the expected OSPF prefixes appear is relevant to the different engineering topic "OSPF backbone membership", but it is not the most directly supported operational verification evidence for this precise case: A core router sees neighbor state Full but no expected internal prefix. the best answer here is: The diagnosis distinguishes LSA absence from route preference or installation.

The peers advance to Full and have consistent eligible LSDB entries is relevant to the different engineering topic "OSPF LSDB synchronization", but it is not the most directly supported operational verification evidence for this precise case: A core router sees neighbor state Full but no expected internal prefix. the best answer here is: The diagnosis distinguishes LSA absence from route preference or installation.

That option concerns IS-IS LAN DIS election. Different Junos show ospf commands reveal different stages of the adjacency-to-route pipeline.

Use interface priority and election behavior correctly when designing an OSPF broadcast segment is relevant to the different engineering topic "OSPF DR/BDR priority election", but it is not the most directly supported technical design or decision for this precise case: An OSPF interface reports Down after an upgrade. the best answer here is: Use OSPF neighbor, interface, database and route views to localize control-plane or policy failures.

That option concerns Native VLAN and untagged trunk behavior. Different Junos show ospf commands reveal different stages of the adjacency-to-route pipeline.

Verify OSPF hello and dead interval compatibility when two interfaces fail to become neighbors is relevant to the different engineering topic "OSPF hello/dead agreement", but it is not the most directly supported technical design or decision for this precise case: An OSPF interface reports Down after an upgrade. the best answer here is: Use OSPF neighbor, interface, database and route views to localize control-plane or policy failures.