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Configure OSPFv3 on the intended IPv6-capable interface and verify link-local neighbor transport is relevant to the different engineering topic "OSPFv3 neighbor formation", but it is not the most directly supported technical design or decision for this precise case: An IPv6 customer route is absent although IS-IS system adjacency is Up. the best answer here is: Advertise IPv6 prefixes using supported IS-IS IPv6 address-family capability and TLVs.

Investigate IPv6 neighbor discovery and router advertisement behavior before declaring a route failure is relevant to the different engineering topic "IPv6 neighbor discovery", but it is not the most directly supported technical design or decision for this precise case: An IPv6 customer route is absent although IS-IS system adjacency is Up. the best answer here is: Advertise IPv6 prefixes using supported IS-IS IPv6 address-family capability and TLVs.

That option concerns VSTP per-VLAN tree behavior. IS-IS can carry IPv6 reachability information over its own control packets independent of OSPFv3.

That option concerns VRRP virtual gateway failover. IS-IS can carry IPv6 reachability information over its own control packets independent of OSPFv3.

That option concerns IPv6 static route next hop. IS-IS can carry IPv6 reachability information over its own control packets independent of OSPFv3.

Check NDP entries, interface status and address scope is relevant to the different engineering topic "IPv6 neighbor discovery", but it is not the most directly supported implementation and troubleshooting step for this precise case: An IPv6 customer route is absent although IS-IS system adjacency is Up. the best answer here is: Check IPv6 address-family export and reachability advertisements.

Only the intended IPv6 prefixes are exchanged after correction is relevant to the different engineering topic "BGP IPv6 unicast family", but it is not the most directly supported operational verification evidence for this precise case: An IPv6 customer route is absent although IS-IS system adjacency is Up. the best answer here is: The specific IPv6 prefix becomes visible after correcting advertisement.

Neighbor resolution becomes valid and bidirectional packets return is relevant to the different engineering topic "IPv6 neighbor discovery", but it is not the most directly supported operational verification evidence for this precise case: An IPv6 customer route is absent although IS-IS system adjacency is Up. the best answer here is: The specific IPv6 prefix becomes visible after correcting advertisement.

That option concerns BGP best-path selection order. IS-IS can carry IPv6 reachability information over its own control packets independent of OSPFv3.

Configure IPv6 static route destinations and next hops using proper IPv6 address semantics is relevant to the different engineering topic "IPv6 static route next hop", but it is not the most directly supported technical design or decision for this precise case: A transit provider introduces IPv6 peering on a dual-stack connection. the best answer here is: Use MP-BGP IPv6 unicast family configuration when exchanging IPv6 NLRI between BGP peers.

Use the outgoing interface context when resolving a link-local IPv6 next hop is relevant to the different engineering topic "IPv6 link-local next-hop scope", but it is not the most directly supported technical design or decision for this precise case: A transit provider introduces IPv6 peering on a dual-stack connection. the best answer here is: Use MP-BGP IPv6 unicast family configuration when exchanging IPv6 NLRI between BGP peers.

That option concerns BGP AS-path loop prevention. BGP IPv6 reachability uses negotiated IPv6 address-family capability and valid IPv6 next-hop attributes.

Configure a supported IPv6-over-IPv4 tunnel with reachable underlay endpoints is relevant to the different engineering topic "IPv6-over-IPv4 tunnel migration", but it is not the most directly supported implementation and troubleshooting step for this precise case: A transit provider introduces IPv6 peering on a dual-stack connection. the best answer here is: Enable the supported IPv6 family and verify route policy.

Inspect how the ingress imposes the outgoing label stack is relevant to the different engineering topic "MPLS push swap pop forwarding", but it is not the most directly supported implementation and troubleshooting step for this precise case: A transit provider introduces IPv6 peering on a dual-stack connection. the best answer here is: Enable the supported IPv6 family and verify route policy.

Inspect show route table inet6.0 and IPv6 forwarding context is relevant to the different engineering topic "IPv6 RIB versus FIB verification", but it is not the most directly supported implementation and troubleshooting step for this precise case: A transit provider introduces IPv6 peering on a dual-stack connection. the best answer here is: Enable the supported IPv6 family and verify route policy.

The first core hop sees the expected MPLS label is relevant to the different engineering topic "MPLS push swap pop forwarding", but it is not the most directly supported operational verification evidence for this precise case: A transit provider introduces IPv6 peering on a dual-stack connection. the best answer here is: Authorized inet6 BGP prefixes are received and installed.

The host resolves the intended router's link-layer address is relevant to the different engineering topic "IPv6 neighbor discovery", but it is not the most directly supported operational verification evidence for this precise case: A transit provider introduces IPv6 peering on a dual-stack connection. the best answer here is: Authorized inet6 BGP prefixes are received and installed.

The route is active and forwards IPv6 packets to the intended gateway is relevant to the different engineering topic "IPv6 static route next hop", but it is not the most directly supported operational verification evidence for this precise case: A transit provider introduces IPv6 peering on a dual-stack connection. the best answer here is: Authorized inet6 BGP prefixes are received and installed.

That option concerns LDP-IGP synchronization. BGP IPv6 reachability uses negotiated IPv6 address-family capability and valid IPv6 next-hop attributes.

Configure IPv6 static route destinations and next hops using proper IPv6 address semantics is relevant to the different engineering topic "IPv6 static route next hop", but it is not the most directly supported technical design or decision for this precise case: A BGP session is Established but no IPv6 NLRI is exchanged. the best answer here is: Use MP-BGP IPv6 unicast family configuration when exchanging IPv6 NLRI between BGP peers.

Investigate IPv6 neighbor discovery and router advertisement behavior before declaring a route failure is relevant to the different engineering topic "IPv6 neighbor discovery", but it is not the most directly supported technical design or decision for this precise case: A BGP session is Established but no IPv6 NLRI is exchanged. the best answer here is: Use MP-BGP IPv6 unicast family configuration when exchanging IPv6 NLRI between BGP peers.

Compare inet6 route preference with actual forwarding next hops is relevant to the different engineering topic "IPv6 RIB versus FIB verification", but it is not the most directly supported implementation and troubleshooting step for this precise case: A BGP session is Established but no IPv6 NLRI is exchanged. the best answer here is: Inspect negotiated families and IPv6-specific import/export policy.

That option concerns IS-IS leaking between levels. BGP IPv6 reachability uses negotiated IPv6 address-family capability and valid IPv6 next-hop attributes.

Check IPv4 reachability to tunnel endpoints and tunnel interface state is relevant to the different engineering topic "IPv6-over-IPv4 tunnel migration", but it is not the most directly supported implementation and troubleshooting step for this precise case: A BGP session is Established but no IPv6 NLRI is exchanged. the best answer here is: Inspect negotiated families and IPv6-specific import/export policy.

That option concerns GRE encapsulation purpose. BGP IPv6 reachability uses negotiated IPv6 address-family capability and valid IPv6 next-hop attributes.

Neighbor resolution becomes valid and bidirectional packets return is relevant to the different engineering topic "IPv6 neighbor discovery", but it is not the most directly supported operational verification evidence for this precise case: A BGP session is Established but no IPv6 NLRI is exchanged. the best answer here is: Only the intended IPv6 prefixes are exchanged after correction.

That option concerns OSPFv3 neighbor formation. BGP IPv6 reachability uses negotiated IPv6 address-family capability and valid IPv6 next-hop attributes.

Verify inet6 route installation and forwarding state separately from IPv4 RIB routes is relevant to the different engineering topic "IPv6 RIB versus FIB verification", but it is not the most directly supported technical design or decision for this precise case: Two IPv6 islands need temporary connectivity across an IPv4-only provider transport. the best answer here is: Use an explicit IPv6-over-IPv4 tunnel where a legacy underlay cannot natively forward IPv6.

That option concerns MPLS label-stack header. An encapsulation tunnel carries IPv6 traffic over an IPv4 transport path with distinct overlay and underlay reachability.

Configure OSPFv3 on the intended IPv6-capable interface and verify link-local neighbor transport is relevant to the different engineering topic "OSPFv3 neighbor formation", but it is not the most directly supported technical design or decision for this precise case: Two IPv6 islands need temporary connectivity across an IPv4-only provider transport. the best answer here is: Use an explicit IPv6-over-IPv4 tunnel where a legacy underlay cannot natively forward IPv6.

Inspect show route table inet6.0 and IPv6 forwarding context is relevant to the different engineering topic "IPv6 RIB versus FIB verification", but it is not the most directly supported implementation and troubleshooting step for this precise case: Two IPv6 islands need temporary connectivity across an IPv4-only provider transport. the best answer here is: Configure a supported IPv6-over-IPv4 tunnel with reachable underlay endpoints.

Inspect neighbor discovery and solicited neighbor state on the VLAN is relevant to the different engineering topic "IPv6 neighbor discovery", but it is not the most directly supported implementation and troubleshooting step for this precise case: Two IPv6 islands need temporary connectivity across an IPv4-only provider transport. the best answer here is: Configure a supported IPv6-over-IPv4 tunnel with reachable underlay endpoints.

That option concerns BGP MED and peer comparison. An encapsulation tunnel carries IPv6 traffic over an IPv4 transport path with distinct overlay and underlay reachability.