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The spare remains a nonroot participant is relevant to the different engineering topic "STP root bridge placement", but it is not the most directly supported operational verification evidence for this precise case: A VLAN's topology changes after a VSTP configuration edit. the best answer here is: Only the intended VLAN's root and port roles change.

The topology remains loop-free after correcting control reception is relevant to the different engineering topic "BPDU visibility on trunks", but it is not the most directly supported operational verification evidence for this precise case: A VLAN's topology changes after a VSTP configuration edit. the best answer here is: Only the intended VLAN's root and port roles change.

That option concerns RIB-group route sharing. VSTP runs a separate spanning-tree context for VLANs, unlike MSTP's grouped-instance approach.

Use RSTP's rapid convergence mechanisms for supported point-to-point and edge roles is relevant to the different engineering topic "RSTP rapid transitions", but it is not the most directly supported technical design or decision for this precise case: A tenant switch advertises a superior bridge ID toward a provider aggregation port. the best answer here is: Use root protection to prevent an unintended downstream bridge from becoming STP root.

Interpret root, designated and alternate port roles relative to the elected bridge is relevant to the different engineering topic "STP root and designated port roles", but it is not the most directly supported technical design or decision for this precise case: A tenant switch advertises a superior bridge ID toward a provider aggregation port. the best answer here is: Use root protection to prevent an unintended downstream bridge from becoming STP root.

That option concerns BGP best-path selection order. Root protection blocks or guards a designated port when superior BPDUs arrive from an untrusted direction.

That option concerns Aggregated-Ethernet minimum links. Root protection blocks or guards a designated port when superior BPDUs arrive from an untrusted direction.

That option concerns MSTP region consistency. Root protection blocks or guards a designated port when superior BPDUs arrive from an untrusted direction.

Inspect roles and path costs across both uplinks is relevant to the different engineering topic "STP root and designated port roles", but it is not the most directly supported implementation and troubleshooting step for this precise case: A tenant switch advertises a superior bridge ID toward a provider aggregation port. the best answer here is: Enable supported root protection at the customer-facing designated boundary.

That option concerns STP root bridge placement. Root protection blocks or guards a designated port when superior BPDUs arrive from an untrusted direction.

The unauthorized bridge cannot create a loop through the edge is relevant to the different engineering topic "BPDU protection for edge ports", but it is not the most directly supported operational verification evidence for this precise case: A tenant switch advertises a superior bridge ID toward a provider aggregation port. the best answer here is: The core retains root authority and the offending link is protected.

That option concerns IPv6 RIB versus FIB verification. Root protection blocks or guards a designated port when superior BPDUs arrive from an untrusted direction.

Use RSTP's rapid convergence mechanisms for supported point-to-point and edge roles is relevant to the different engineering topic "RSTP rapid transitions", but it is not the most directly supported technical design or decision for this precise case: A downstream port enters a root-protected state during a customer change. the best answer here is: Use root protection to prevent an unintended downstream bridge from becoming STP root.

That option concerns Spanning-tree troubleshooting and edge settings. Root protection blocks or guards a designated port when superior BPDUs arrive from an untrusted direction.

That option concerns IPv6 neighbor discovery. Root protection blocks or guards a designated port when superior BPDUs arrive from an untrusted direction.

Review root ID and cost computations is relevant to the different engineering topic "STP root and designated port roles", but it is not the most directly supported implementation and troubleshooting step for this precise case: A downstream port enters a root-protected state during a customer change. the best answer here is: Inspect received superior BPDUs and verify the correct boundary role.

That option concerns MPLS forwarding-equivalence classes. Root protection blocks or guards a designated port when superior BPDUs arrive from an untrusted direction.

Inspect BPDU protection events and remove unintended bridge attachment is relevant to the different engineering topic "BPDU protection for edge ports", but it is not the most directly supported implementation and troubleshooting step for this precise case: A downstream port enters a root-protected state during a customer change. the best answer here is: Inspect received superior BPDUs and verify the correct boundary role.

That option concerns BPDU visibility on trunks. Root protection blocks or guards a designated port when superior BPDUs arrive from an untrusted direction.

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 downstream port enters a root-protected state during a customer change. the best answer here is: The root hierarchy stays stable until the customer configuration is corrected.

That option concerns OSPFv3 neighbor formation. Root protection blocks or guards a designated port when superior BPDUs arrive from an untrusted direction.

That option concerns IS-IS IPv6 reachability. Edge BPDU protection can disable or guard a port if BPDUs appear where only end hosts should connect.

Use VSTP only when per-VLAN spanning-tree operation is actually desired and supported is relevant to the different engineering topic "VSTP per-VLAN tree behavior", but it is not the most directly supported technical design or decision for this precise case: An employee installs an unmanaged bridge on a user-facing access jack. the best answer here is: Use BPDU protection at true edge ports to react to unexpected switches.

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: An employee installs an unmanaged bridge on a user-facing access jack. the best answer here is: Use BPDU protection at true edge ports to react to unexpected switches.

Configure per-VLAN spanning tree and intended priorities is relevant to the different engineering topic "VSTP per-VLAN tree behavior", but it is not the most directly supported implementation and troubleshooting step for this precise case: An employee installs an unmanaged bridge on a user-facing access jack. the best answer here is: Use appropriate edge BPDU protection on that designated host port.

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: An employee installs an unmanaged bridge on a user-facing access jack. the best answer here is: Use appropriate edge BPDU protection on that designated host port.

That option concerns OSPF operational troubleshooting. Edge BPDU protection can disable or guard a port if BPDUs appear where only end hosts should connect.

That option concerns LDP-IGP synchronization. Edge BPDU protection can disable or guard a port if BPDUs appear where only end hosts should connect.

Each VLAN uses the appropriate elected root is relevant to the different engineering topic "VSTP per-VLAN tree behavior", but it is not the most directly supported operational verification evidence for this precise case: An employee installs an unmanaged bridge on a user-facing access jack. the best answer here is: The unauthorized bridge cannot create a loop through the edge.

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: An employee installs an unmanaged bridge on a user-facing access jack. the best answer here is: The unauthorized bridge cannot create a loop through the edge.

That option concerns GRE underlay route recursion. Edge BPDU protection can disable or guard a port if BPDUs appear where only end hosts should connect.

That option concerns RSTP rapid transitions. Edge BPDU protection can disable or guard a port if BPDUs appear where only end hosts should connect.

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 host-facing port unexpectedly transitions to disabled after receiving a BPDU. the best answer here is: Use BPDU protection at true edge ports to react to unexpected switches.