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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.

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: Two IPv6 islands need temporary connectivity across an IPv4-only provider transport. the best answer here is: IPv6 packets traverse the IPv4 core through the intended tunnel.

That option concerns BFD rapid failure detection. An encapsulation tunnel carries IPv6 traffic over an IPv4 transport path with distinct overlay and underlay reachability.

The inet6 routing table contains expected IS-IS learned prefixes is relevant to the different engineering topic "IS-IS IPv6 reachability", but it is not the most directly supported operational verification evidence for this precise case: Two IPv6 islands need temporary connectivity across an IPv4-only provider transport. the best answer here is: IPv6 packets traverse the IPv4 core through the intended tunnel.

That option concerns OSPF router-ID uniqueness. 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: The tunnel is configured but carries no IPv6 traffic after an underlay route change. the best answer here is: Use an explicit IPv6-over-IPv4 tunnel where a legacy underlay cannot natively forward IPv6.

Use MP-BGP IPv6 unicast family configuration when exchanging IPv6 NLRI between BGP peers is relevant to the different engineering topic "BGP IPv6 unicast family", but it is not the most directly supported technical design or decision for this precise case: The tunnel is configured but carries no IPv6 traffic after an underlay route change. the best answer here is: Use an explicit IPv6-over-IPv4 tunnel where a legacy underlay cannot natively forward IPv6.

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: The tunnel is configured but carries no IPv6 traffic after an underlay route change. the best answer here is: Check IPv4 reachability to tunnel endpoints and tunnel interface state.

That option concerns LDP-IGP synchronization. An encapsulation tunnel carries IPv6 traffic over an IPv4 transport path with distinct overlay and underlay reachability.

Inspect negotiated families and IPv6-specific import/export policy is relevant to the different engineering topic "BGP IPv6 unicast family", but it is not the most directly supported implementation and troubleshooting step for this precise case: The tunnel is configured but carries no IPv6 traffic after an underlay route change. the best answer here is: Check IPv4 reachability to tunnel endpoints and tunnel interface state.

The IPv6 control-plane issue is isolated without disturbing IPv4 OSPFv2 is relevant to the different engineering topic "OSPFv3 neighbor formation", but it is not the most directly supported operational verification evidence for this precise case: The tunnel is configured but carries no IPv6 traffic after an underlay route change. the best answer here is: IPv6 overlay packets pass when underlay transport is restored.

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: The tunnel is configured but carries no IPv6 traffic after an underlay route change. the best answer here is: IPv6 overlay packets pass when underlay transport is restored.

That option concerns IS-IS NET addressing. An encapsulation tunnel carries IPv6 traffic over an IPv4 transport path with distinct overlay and underlay reachability.

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: An IPv6 host can reach its own address but not the local gateway. the best answer here is: Investigate IPv6 neighbor discovery and router advertisement behavior before declaring a route failure.

That option concerns LDP-IGP synchronization. ICMPv6 Neighbor Solicitation and Advertisement resolve local neighbor link-layer reachability and depend on link-local scope.

Use MP-BGP IPv6 unicast family configuration when exchanging IPv6 NLRI between BGP peers is relevant to the different engineering topic "BGP IPv6 unicast family", but it is not the most directly supported technical design or decision for this precise case: An IPv6 host can reach its own address but not the local gateway. the best answer here is: Investigate IPv6 neighbor discovery and router advertisement behavior before declaring a route failure.

Add the approved ::/0 route with a reachable IPv6 next hop is relevant to the different engineering topic "IPv6 static route next hop", but it is not the most directly supported implementation and troubleshooting step for this precise case: An IPv6 host can reach its own address but not the local gateway. the best answer here is: Inspect neighbor discovery and solicited neighbor state on the VLAN.

That option concerns BGP message processing. ICMPv6 Neighbor Solicitation and Advertisement resolve local neighbor link-layer reachability and depend on link-local scope.

Enable the supported IPv6 family and verify route policy is relevant to the different engineering topic "BGP IPv6 unicast family", but it is not the most directly supported implementation and troubleshooting step for this precise case: An IPv6 host can reach its own address but not the local gateway. the best answer here is: Inspect neighbor discovery and solicited neighbor state on the VLAN.

That option concerns Qualified-next-hop selection. ICMPv6 Neighbor Solicitation and Advertisement resolve local neighbor link-layer reachability and depend on link-local scope.

The intended IPv6 next hop and active route are present is relevant to the different engineering topic "IPv6 RIB versus FIB verification", but it is not the most directly supported operational verification evidence for this precise case: An IPv6 host can reach its own address but not the local gateway. the best answer here is: The host resolves the intended router's link-layer address.

IPv6 packets traverse the IPv4 core through the intended tunnel is relevant to the different engineering topic "IPv6-over-IPv4 tunnel migration", but it is not the most directly supported operational verification evidence for this precise case: An IPv6 host can reach its own address but not the local gateway. the best answer here is: The host resolves the intended router's link-layer address.

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 provider PE has an IPv6 route but no packets return over the directly attached segment. the best answer here is: Investigate IPv6 neighbor discovery and router advertisement behavior before declaring a route failure.

Use an explicit IPv6-over-IPv4 tunnel where a legacy underlay cannot natively forward IPv6 is relevant to the different engineering topic "IPv6-over-IPv4 tunnel migration", but it is not the most directly supported technical design or decision for this precise case: A provider PE has an IPv6 route but no packets return over the directly attached segment. the best answer here is: Investigate IPv6 neighbor discovery and router advertisement behavior before declaring a route failure.

That option concerns GRES Routing Engine failover. ICMPv6 Neighbor Solicitation and Advertisement resolve local neighbor link-layer reachability and depend on link-local scope.

That option concerns OSPF LSDB synchronization. ICMPv6 Neighbor Solicitation and Advertisement resolve local neighbor link-layer reachability and depend on link-local scope.

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 provider PE has an IPv6 route but no packets return over the directly attached segment. the best answer here is: Check NDP entries, interface status and address scope.

That option concerns IPv6 link-local next-hop scope. ICMPv6 Neighbor Solicitation and Advertisement resolve local neighbor link-layer reachability and depend on link-local scope.

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: A provider PE has an IPv6 route but no packets return over the directly attached segment. the best answer here is: Neighbor resolution becomes valid and bidirectional packets return.

That option concerns OSPFv3 neighbor formation, not the requirement in this case.

That option concerns Penultimate-hop popping. ICMPv6 Neighbor Solicitation and Advertisement resolve local neighbor link-layer reachability and depend on link-local scope.