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Inspect route detail and ensure the authorized next-hop route exists is relevant to the different engineering topic "BGP next-hop reachability", but it is not the most directly supported implementation and troubleshooting step for this precise case: A transit peer is Established but a new customer route is absent locally. the best answer here is: Check receive-protocol bgp and import policy before investigating forwarding.

That option concerns RSVP LSP signaling. An Established BGP session does not prove a prefix is accepted, active or exported.

That option concerns BGP outbound advertisement policy. An Established BGP session does not prove a prefix is accepted, active or exported.

That option concerns IBGP route propagation constraints. An Established BGP session does not prove a prefix is accepted, active or exported.

That option concerns LDP session discovery, not the requirement in this case.

Internal BGP selection prefers the configured primary when paths are otherwise valid is relevant to the different engineering topic "BGP local preference selection", but it is not the most directly supported operational verification evidence for this precise case: A transit peer is Established but a new customer route is absent locally. the best answer here is: The cause is narrowed to advertisement, rejection or route selection.

That option concerns Spanning-tree troubleshooting and edge settings. An Established BGP session does not prove a prefix is accepted, active or exported.

Use BGP groups to share policy and common parameters while retaining correct peer-specific settings is relevant to the different engineering topic "BGP peer-group policy inheritance", but it is not the most directly supported technical design or decision for this precise case: A locally active route is not reaching an intended BGP neighbor. the best answer here is: Use show bgp neighbor and show route protocol/receive/advertising views to separate session, policy and RIB problems.

Use local preference to express preferred outbound exit within an AS is relevant to the different engineering topic "BGP local preference selection", but it is not the most directly supported technical design or decision for this precise case: A locally active route is not reaching an intended BGP neighbor. the best answer here is: Use show bgp neighbor and show route protocol/receive/advertising views to separate session, policy and RIB problems.

Check next-hop attributes and IGP reachability is relevant to the different engineering topic "BGP next-hop reachability", but it is not the most directly supported implementation and troubleshooting step for this precise case: A locally active route is not reaching an intended BGP neighbor. the best answer here is: Check export policy and show route advertising-protocol bgp.

That option concerns OSPF backbone membership. An Established BGP session does not prove a prefix is accepted, active or exported.

That option concerns BGP inbound routing policy. An Established BGP session does not prove a prefix is accepted, active or exported.

That option concerns IPv6 link-local next-hop scope. An Established BGP session does not prove a prefix is accepted, active or exported.

Selected best paths reflect intended internal exit policy is relevant to the different engineering topic "BGP local preference selection", but it is not the most directly supported operational verification evidence for this precise case: A locally active route is not reaching an intended BGP neighbor. the best answer here is: Outbound advertisement matches the intended prefix policy.

That option concerns BGP TCP session and AS negotiation, not the requirement in this case.

That option concerns IS-IS overload bit maintenance. A bridge learns source MAC addresses in a VLAN and uses the learned destination mapping to choose an egress interface.

Assign single-VLAN untagged endpoint traffic to the correct access VLAN on Junos switches is relevant to the different engineering topic "Access port VLAN membership", but it is not the most directly supported technical design or decision for this precise case: A newly connected server can send traffic but cannot receive unicast replies. the best answer here is: Diagnose Ethernet MAC learning by VLAN and ingress port before changing bridge forwarding policy.

Use a service VLAN outer tag to transport distinct customer VLANs through a provider bridge is relevant to the different engineering topic "Provider bridging Q-in-Q", but it is not the most directly supported technical design or decision for this precise case: A newly connected server can send traffic but cannot receive unicast replies. the best answer here is: Diagnose Ethernet MAC learning by VLAN and ingress port before changing bridge forwarding policy.

That option concerns Junos VLAN operational validation. A bridge learns source MAC addresses in a VLAN and uses the learned destination mapping to choose an egress interface.

Assign separate provider S-VLANs while retaining each customer inner tag is relevant to the different engineering topic "Provider bridging Q-in-Q", but it is not the most directly supported implementation and troubleshooting step for this precise case: A newly connected server can send traffic but cannot receive unicast replies. the best answer here is: Inspect the MAC forwarding table for the relevant VLAN and physical interface.

That option concerns OSPF passive-interface and export policy. A bridge learns source MAC addresses in a VLAN and uses the learned destination mapping to choose an egress interface.

Frames arrive in the intended bridge domain without a VLAN tag from the host is relevant to the different engineering topic "Access port VLAN membership", but it is not the most directly supported operational verification evidence for this precise case: A newly connected server can send traffic but cannot receive unicast replies. the best answer here is: The host's source MAC is learned on the correct interface.

Both allowed VLANs pass while VLAN700 is absent is relevant to the different engineering topic "Trunk tagging and VLAN allowlist", but it is not the most directly supported operational verification evidence for this precise case: A newly connected server can send traffic but cannot receive unicast replies. the best answer here is: The host's source MAC is learned on the correct interface.

That option concerns IS-IS wide metrics. A bridge learns source MAC addresses in a VLAN and uses the learned destination mapping to choose an egress interface.

That option concerns Native VLAN and untagged trunk behavior. A bridge learns source MAC addresses in a VLAN and uses the learned destination mapping to choose an egress interface.

Choose VLAN tag translation when the service needs intentional replacement of an 802.1Q tag is relevant to the different engineering topic "VLAN translation distinction", but it is not the most directly supported technical design or decision for this precise case: A service-provider switch suddenly reports a customer MAC on a different trunk. the best answer here is: Diagnose Ethernet MAC learning by VLAN and ingress port before changing bridge forwarding policy.

That option concerns GRE tunnel forwarding tests. A bridge learns source MAC addresses in a VLAN and uses the learned destination mapping to choose an egress interface.

That option concerns Unknown unicast and flooding. A bridge learns source MAC addresses in a VLAN and uses the learned destination mapping to choose an egress interface.

Inspect outer and inner tag handling on the QinQ service is relevant to the different engineering topic "Provider bridging Q-in-Q", but it is not the most directly supported implementation and troubleshooting step for this precise case: A service-provider switch suddenly reports a customer MAC on a different trunk. the best answer here is: Check the learning history and topology before disabling the port.

That option concerns IS-IS TLV reachability advertisements. A bridge learns source MAC addresses in a VLAN and uses the learned destination mapping to choose an egress interface.

That option concerns IPv6-over-IPv4 tunnel migration. A bridge learns source MAC addresses in a VLAN and uses the learned destination mapping to choose an egress interface.

That option concerns Virtual-switch routing instance. A bridge learns source MAC addresses in a VLAN and uses the learned destination mapping to choose an egress interface.

The expected tagged VLAN appears on the port and forwarding resumes is relevant to the different engineering topic "Trunk tagging and VLAN allowlist", but it is not the most directly supported operational verification evidence for this precise case: A service-provider switch suddenly reports a customer MAC on a different trunk. the best answer here is: The forwarding entry maps the MAC to the actual active customer handoff.