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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.

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

That option concerns STP root and designated port roles. Edge BPDU protection can disable or guard a port if BPDUs appear where only end hosts should connect.

Inspect loss of BPDU reception and directionality 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 host-facing port unexpectedly transitions to disabled after receiving a BPDU. the best answer here is: Inspect BPDU protection events and remove unintended bridge attachment.

The root hierarchy stays stable until the customer configuration is corrected 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 host-facing port unexpectedly transitions to disabled after receiving a BPDU. the best answer here is: The port is restored only when edge behavior is safe.

That option concerns Integrated routing and bridging. Edge BPDU protection can disable or guard a port if BPDUs appear where only end hosts should connect.

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 host-facing port unexpectedly transitions to disabled after receiving a BPDU. the best answer here is: The port is restored only when edge behavior is safe.

That option concerns IPv6 neighbor discovery. Loop protection helps prevent blocked ports from erroneously transitioning to forwarding after loss of BPDU information.

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 alternate uplink loses one-way BPDU reception while data link remains Up. the best answer here is: Use loop protection on an appropriate STP port to avoid unsafe forwarding when expected BPDUs disappear.

Plan bridge priority so the intended resilient aggregation switch is root for a spanning-tree topology is relevant to the different engineering topic "STP root bridge placement", but it is not the most directly supported technical design or decision for this precise case: An alternate uplink loses one-way BPDU reception while data link remains Up. the best answer here is: Use loop protection on an appropriate STP port to avoid unsafe forwarding when expected BPDUs disappear.

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: An alternate uplink loses one-way BPDU reception while data link remains Up. the best answer here is: Apply supported loop protection at the appropriate role.

Inspect BPDU counters and filtering on participating ports is relevant to the different engineering topic "BPDU visibility on trunks", but it is not the most directly supported implementation and troubleshooting step for this precise case: An alternate uplink loses one-way BPDU reception while data link remains Up. the best answer here is: Apply supported loop protection at the appropriate role.

That option concerns GRES Routing Engine failover. Loop protection helps prevent blocked ports from erroneously transitioning to forwarding after loss of BPDU information.

That option concerns STP root and designated port roles. Loop protection helps prevent blocked ports from erroneously transitioning to forwarding after loss of BPDU information.

That option concerns IS-IS Level-1/Level-2 reachability. Loop protection helps prevent blocked ports from erroneously transitioning to forwarding after loss of BPDU information.

The alternate path transitions appropriately when the active link fails 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: An alternate uplink loses one-way BPDU reception while data link remains Up. the best answer here is: The suspect link remains guarded rather than creating a bridge loop.

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: A port shows loop-inconsistent state after fiber impairment. the best answer here is: Use loop protection on an appropriate STP port to avoid unsafe forwarding when expected BPDUs disappear.

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 port shows loop-inconsistent state after fiber impairment. the best answer here is: Use loop protection on an appropriate STP port to avoid unsafe forwarding when expected BPDUs disappear.

That option concerns Access port VLAN membership. Loop protection helps prevent blocked ports from erroneously transitioning to forwarding after loss of BPDU information.

Check port type, edge settings and neighbor protocol compatibility is relevant to the different engineering topic "RSTP rapid transitions", but it is not the most directly supported implementation and troubleshooting step for this precise case: A port shows loop-inconsistent state after fiber impairment. the best answer here is: Inspect loss of BPDU reception and directionality.

Inspect show spanning-tree bridge and interface for that VLAN 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: A port shows loop-inconsistent state after fiber impairment. the best answer here is: Inspect loss of BPDU reception and directionality.

That option concerns GRE tunnel forwarding tests. Loop protection helps prevent blocked ports from erroneously transitioning to forwarding after loss of BPDU information.

The port is restored only when edge behavior is safe 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 port shows loop-inconsistent state after fiber impairment. the best answer here is: Normal spanning-tree recovery follows correction of the control path.

That option concerns OSPF two-way versus full neighbors. Loop protection helps prevent blocked ports from erroneously transitioning to forwarding after loss of BPDU information.

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 port shows loop-inconsistent state after fiber impairment. the best answer here is: Normal spanning-tree recovery follows correction of the control path.

Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable is relevant to the different engineering topic "BPDU visibility on trunks", but it is not the most directly supported technical design or decision for this precise case: An access switch sees intermittent loops after a new redundant uplink is connected. the best answer here is: Check correct edge designation and port roles before overriding an STP blocking decision.

That option concerns SR-MPLS shortest-path transport. True edge ports can transition rapidly, but transit trunks need valid loop-prevention state.

That option concerns Root protection policy. True edge ports can transition rapidly, but transit trunks need valid loop-prevention state.

That option concerns GRE underlay route recursion. True edge ports can transition rapidly, but transit trunks need valid loop-prevention state.

That option concerns STP root and designated port roles. True edge ports can transition rapidly, but transit trunks need valid loop-prevention state.

That option concerns STP root bridge placement. True edge ports can transition rapidly, but transit trunks need valid loop-prevention state.