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That option concerns MPLS route and forwarding tables. IS-IS Level-1/Level-2 route advertisement follows configured policies and defaults; prefix leaking is a deliberate design choice.

Use supported wide IS-IS metrics to reflect link cost and network design at the correct level is relevant to the different engineering topic "IS-IS wide metrics", but it is not the most directly supported technical design or decision for this precise case: A Level-1 prefix must be known outside its area for service reachability. the best answer here is: Apply controlled route advertisement between Level-1 and Level-2 areas instead of relying on blanket reachability.

Interpret IS-IS TLVs as typed data for advertised topology, protocol reachability and capabilities is relevant to the different engineering topic "IS-IS TLV reachability advertisements", but it is not the most directly supported technical design or decision for this precise case: A Level-1 prefix must be known outside its area for service reachability. the best answer here is: Apply controlled route advertisement between Level-1 and Level-2 areas instead of relying on blanket reachability.

Inspect supported capability TLVs in neighbor LSPs is relevant to the different engineering topic "IS-IS TLV reachability advertisements", but it is not the most directly supported implementation and troubleshooting step for this precise case: A Level-1 prefix must be known outside its area for service reachability. the best answer here is: Inspect the Level-1/Level-2 router's advertisement policy and route eligibility.

That option concerns GRE encapsulation purpose. IS-IS Level-1/Level-2 route advertisement follows configured policies and defaults; prefix leaking is a deliberate design choice.

Review overload configuration and operational state is relevant to the different engineering topic "IS-IS overload bit maintenance", but it is not the most directly supported implementation and troubleshooting step for this precise case: A Level-1 prefix must be known outside its area for service reachability. the best answer here is: Inspect the Level-1/Level-2 router's advertisement policy and route eligibility.

That option concerns Provider bridging Q-in-Q. IS-IS Level-1/Level-2 route advertisement follows configured policies and defaults; prefix leaking is a deliberate design choice.

Accepted LSPs correspond to authenticated peers is relevant to the different engineering topic "IS-IS authentication checks", but it is not the most directly supported operational verification evidence for this precise case: A Level-1 prefix must be known outside its area for service reachability. the best answer here is: The intended prefix is propagated without exposing unrelated private networks.

The SPF decision matches the approved link cost plan is relevant to the different engineering topic "IS-IS wide metrics", but it is not the most directly supported operational verification evidence for this precise case: A Level-1 prefix must be known outside its area for service reachability. the best answer here is: The intended prefix is propagated without exposing unrelated private networks.

That option concerns BGP local preference selection. BGP sessions use TCP 179 and OPEN negotiation, and an AS mismatch prevents normal establishment.

Filter and modify received BGP routes with explicit import policy terms is relevant to the different engineering topic "BGP inbound routing policy", but it is not the most directly supported technical design or decision for this precise case: An edge PE expects an external transit neighbor in AS64520. the best answer here is: Configure an eBGP or iBGP peer with the correct peer AS and reachable TCP endpoint.

That option concerns MPLS label-stack header. BGP sessions use TCP 179 and OPEN negotiation, and an AS mismatch prevents normal establishment.

Apply explicit BGP export policy matching authorized active routes is relevant to the different engineering topic "BGP outbound advertisement policy", but it is not the most directly supported implementation and troubleshooting step for this precise case: An edge PE expects an external transit neighbor in AS64520. the best answer here is: Configure the BGP neighbor with the correct peer AS and reachable endpoint.

That option concerns RSTP rapid transitions. BGP sessions use TCP 179 and OPEN negotiation, and an AS mismatch prevents normal establishment.

That option concerns IBGP route propagation constraints. BGP sessions use TCP 179 and OPEN negotiation, and an AS mismatch prevents normal establishment.

That option concerns Router-LSA type-one interpretation. BGP sessions use TCP 179 and OPEN negotiation, and an AS mismatch prevents normal establishment.

The neighbor sees exactly the intended advertised prefixes is relevant to the different engineering topic "BGP outbound advertisement policy", but it is not the most directly supported operational verification evidence for this precise case: An edge PE expects an external transit neighbor in AS64520. the best answer here is: show bgp neighbor reports Established after valid TCP and OPEN exchange.

The BGP prefix becomes eligible only when the next hop resolves is relevant to the different engineering topic "BGP next-hop reachability", but it is not the most directly supported operational verification evidence for this precise case: An edge PE expects an external transit neighbor in AS64520. the best answer here is: show bgp neighbor reports Established after valid TCP and OPEN exchange.

Use show bgp neighbor and show route protocol/receive/advertising views to separate session, policy and RIB problems is relevant to the different engineering topic "BGP route-troubleshooting CLI", but it is not the most directly supported technical design or decision for this precise case: A BGP session cycles in Active after a core addressing change. the best answer here is: Configure an eBGP or iBGP peer with the correct peer AS and reachable TCP endpoint.

Interpret OPEN, UPDATE, KEEPALIVE and NOTIFICATION roles during session setup and operation is relevant to the different engineering topic "BGP message processing", but it is not the most directly supported technical design or decision for this precise case: A BGP session cycles in Active after a core addressing change. the best answer here is: Configure an eBGP or iBGP peer with the correct peer AS and reachable TCP endpoint.

That option concerns OSPF hello/dead agreement. BGP sessions use TCP 179 and OPEN negotiation, and an AS mismatch prevents normal establishment.

That option concerns OSPF interface metric selection. BGP sessions use TCP 179 and OPEN negotiation, and an AS mismatch prevents normal establishment.

Inspect term order and matching conditions against show route receive-protocol bgp is relevant to the different engineering topic "BGP inbound routing policy", but it is not the most directly supported implementation and troubleshooting step for this precise case: A BGP session cycles in Active after a core addressing change. the best answer here is: Validate next-hop reachability and TCP connectivity before modifying policy.

Read the error code and compare configured capability and AS expectations is relevant to the different engineering topic "BGP message processing", but it is not the most directly supported implementation and troubleshooting step for this precise case: A BGP session cycles in Active after a core addressing change. the best answer here is: Validate next-hop reachability and TCP connectivity before modifying policy.

That option concerns BGP AS-path loop prevention. BGP sessions use TCP 179 and OPEN negotiation, and an AS mismatch prevents normal establishment.

That option concerns OSPF router-ID uniqueness. BGP sessions use TCP 179 and OPEN negotiation, and an AS mismatch prevents normal establishment.

That option concerns BGP peer-group policy inheritance. BGP sessions use TCP 179 and OPEN negotiation, and an AS mismatch prevents normal establishment.

That option concerns RSVP explicit-route constraints. BGP message classes establish sessions, advertise or withdraw routes, maintain liveliness and signal protocol errors.

That option concerns BGP MED and peer comparison. BGP message classes establish sessions, advertise or withdraw routes, maintain liveliness and signal protocol errors.

Verify the BGP NEXT_HOP resolves in the correct table before expecting installation is relevant to the different engineering topic "BGP next-hop reachability", but it is not the most directly supported technical design or decision for this precise case: A newly established BGP peer exchanges no routes after Keepalives begin. the best answer here is: Interpret OPEN, UPDATE, KEEPALIVE and NOTIFICATION roles during session setup and operation.

That option concerns BGP local preference selection. BGP message classes establish sessions, advertise or withdraw routes, maintain liveliness and signal protocol errors.

Review full-mesh or supported route-reflection design rather than changing EBGP ASNs is relevant to the different engineering topic "IBGP route propagation constraints", but it is not the most directly supported implementation and troubleshooting step for this precise case: A newly established BGP peer exchanges no routes after Keepalives begin. the best answer here is: Inspect import/export policy and UPDATE advertisements.

That option concerns OSPF hello/dead agreement. BGP message classes establish sessions, advertise or withdraw routes, maintain liveliness and signal protocol errors.