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That option concerns VSTP per-VLAN tree behavior. The root bridge establishes the reference point for STP path cost and port-role decisions.

Operational roles permit the intended rapid transition is relevant to the different engineering topic "RSTP rapid transitions", but it is not the most directly supported operational verification evidence for this precise case: A spare switch with a low bridge ID is connected during a maintenance test. the best answer here is: The spare remains a nonroot participant.

That option concerns IPv6 static route next hop. The root bridge establishes the reference point for STP path cost and port-role decisions.

Check correct edge designation and port roles before overriding an STP blocking decision is relevant to the different engineering topic "Spanning-tree troubleshooting and edge settings", but it is not the most directly supported technical design or decision for this precise case: A campus edge bridge has two uplinks to the same STP root. the best answer here is: Interpret root, designated and alternate port roles relative to the elected bridge.

That option concerns IPv6-over-IPv4 tunnel migration. A nonroot bridge has a root port toward the root, while designated ports forward for segments and alternate ports provide loop avoidance.

Use loop protection on an appropriate STP port to avoid unsafe forwarding when expected BPDUs disappear is relevant to the different engineering topic "Loop protection when BPDUs vanish", but it is not the most directly supported technical design or decision for this precise case: A campus edge bridge has two uplinks to the same STP root. the best answer here is: Interpret root, designated and alternate port roles relative to the elected bridge.

That option concerns STP root bridge placement, not the requirement in this case.

Apply supported loop protection at the appropriate role is relevant to the different engineering topic "Loop protection when BPDUs vanish", but it is not the most directly supported implementation and troubleshooting step for this precise case: A campus edge bridge has two uplinks to the same STP root. the best answer here is: Inspect roles and path costs across both uplinks.

That option concerns OSPF backbone membership. A nonroot bridge has a root port toward the root, while designated ports forward for segments and alternate ports provide loop avoidance.

The duplicate path is safely blocked or protected is relevant to the different engineering topic "Spanning-tree troubleshooting and edge settings", but it is not the most directly supported operational verification evidence for this precise case: A campus edge bridge has two uplinks to the same STP root. the best answer here is: One root path forwards while an alternate path prevents a loop.

That option concerns VSTP per-VLAN tree behavior. A nonroot bridge has a root port toward the root, while designated ports forward for segments and alternate ports provide loop avoidance.

That option concerns BGP inbound routing policy. A nonroot bridge has a root port toward the root, while designated ports forward for segments and alternate ports provide loop avoidance.

Ensure MSTP region name, revision and VLAN-to-instance mapping agree across the intended switches is relevant to the different engineering topic "MSTP region consistency", but it is not the most directly supported technical design or decision for this precise case: A new link changes STP roles unexpectedly after a topology upgrade. the best answer here is: Interpret root, designated and alternate port roles relative to the elected bridge.

That option concerns LDP-IGP synchronization. A nonroot bridge has a root port toward the root, while designated ports forward for segments and alternate ports provide loop avoidance.

Check correct edge designation and port roles before overriding an STP blocking decision is relevant to the different engineering topic "Spanning-tree troubleshooting and edge settings", but it is not the most directly supported technical design or decision for this precise case: A new link changes STP roles unexpectedly after a topology upgrade. the best answer here is: Interpret root, designated and alternate port roles relative to the elected bridge.

That option concerns LDP session discovery. A nonroot bridge has a root port toward the root, while designated ports forward for segments and alternate ports provide loop avoidance.

That option concerns BPDU visibility on trunks. A nonroot bridge has a root port toward the root, while designated ports forward for segments and alternate ports provide loop avoidance.

Inspect received superior BPDUs and verify the correct boundary role is relevant to the different engineering topic "Root protection policy", but it is not the most directly supported implementation and troubleshooting step for this precise case: A new link changes STP roles unexpectedly after a topology upgrade. the best answer here is: Review root ID and cost computations.

That option concerns RSTP rapid transitions. A nonroot bridge has a root port toward the root, while designated ports forward for segments and alternate ports provide loop avoidance.

That option concerns Forwarding-table multipath. A nonroot bridge has a root port toward the root, while designated ports forward for segments and alternate ports provide loop avoidance.

Each VLAN group follows its intended MSTI tree is relevant to the different engineering topic "MSTP region consistency", but it is not the most directly supported operational verification evidence for this precise case: A new link changes STP roles unexpectedly after a topology upgrade. the best answer here is: Port roles follow the approved shortest path design.

Use root protection to prevent an unintended downstream bridge from becoming STP root is relevant to the different engineering topic "Root protection policy", but it is not the most directly supported technical design or decision for this precise case: A switched metro segment stops receiving expected root BPDUs. the best answer here is: Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable.

Check correct edge designation and port roles before overriding an STP blocking decision is relevant to the different engineering topic "Spanning-tree troubleshooting and edge settings", but it is not the most directly supported technical design or decision for this precise case: A switched metro segment stops receiving expected root BPDUs. the best answer here is: Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable.

That option concerns Native VLAN and untagged trunk behavior. BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

Enable supported root protection at the customer-facing designated boundary is relevant to the different engineering topic "Root protection policy", but it is not the most directly supported implementation and troubleshooting step for this precise case: A switched metro segment stops receiving expected root BPDUs. the best answer here is: Inspect BPDU counters and filtering on participating ports.

That option concerns MSTP region consistency. BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

That option concerns RIB-group route sharing. BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

The core retains root authority and the offending link is protected is relevant to the different engineering topic "Root protection policy", but it is not the most directly supported operational verification evidence for this precise case: A switched metro segment stops receiving expected root BPDUs. the best answer here is: Eligible ports receive control frames and agree on root topology.

The suspect link remains guarded rather than creating a bridge loop is relevant to the different engineering topic "Loop protection when BPDUs vanish", but it is not the most directly supported operational verification evidence for this precise case: A switched metro segment stops receiving expected root BPDUs. the best answer here is: Eligible ports receive control frames and agree on root topology.

That option concerns OSPF interface metric selection. BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

Use loop protection on an appropriate STP port to avoid unsafe forwarding when expected BPDUs disappear is relevant to the different engineering topic "Loop protection when BPDUs vanish", but it is not the most directly supported technical design or decision for this precise case: A one-way fiber failure leaves a redundant bridged topology at risk. the best answer here is: Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable.

That option concerns OSPF operational troubleshooting. BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

Use BPDU protection at true edge ports to react to unexpected switches is relevant to the different engineering topic "BPDU protection for edge ports", but it is not the most directly supported technical design or decision for this precise case: A one-way fiber failure leaves a redundant bridged topology at risk. the best answer here is: Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable.