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Configure compatible LACP participation on both ends and bundle only links with matching attributes. This instead concerns lacp mode compatibility. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. It would not implement the specifically required change. The immediate problem concerns native vlan mismatch.

Configure supported bridge priorities to place the intended core or distribution bridge as STP root for the affected instance. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not implement the specifically required change. The immediate problem concerns native vlan mismatch.

Retain edge BPDU guard for user-facing ports and move legitimate infrastructure bridges to appropriately managed uplinks. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not implement the specifically required change. The immediate problem concerns native vlan mismatch.

Verify the negotiated aggregator and active collecting or distributing member set are stable under traffic. This instead concerns lacp mode compatibility. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. It would not establish that this function actually works. The immediate problem concerns native vlan mismatch.

Verify stable root identity, forwarding and blocking states and lower topology-change event counts. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not establish that this function actually works. The immediate problem concerns native vlan mismatch.

Validate the edge port rejects the unexpected bridge while authorized end devices reconnect normally. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not establish that this function actually works. The immediate problem concerns native vlan mismatch.

Restore the previously compatible channel parameters and isolate any link that would otherwise create parallel paths. This instead concerns lacp mode compatibility. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. It would not safely roll back the relevant failed change. The immediate problem concerns native vlan mismatch.

Restore the approved bridge priorities and remove the misconfigured link if an unintended loop appears. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not safely roll back the relevant failed change. The immediate problem concerns native vlan mismatch.

Remove the unauthorized bridge and clear the guard-triggered port fault only after verifying proper edge policy. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not safely roll back the relevant failed change. The immediate problem concerns native vlan mismatch.

Review local and peer LACP mode, system IDs and member negotiation state. This instead concerns lacp mode compatibility. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. It does not isolate the cause of the stated incident. The immediate problem concerns native vlan mismatch.

Review spanning-tree root bridge IDs, priorities, path costs and instance membership. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It does not isolate the cause of the stated incident. The immediate problem concerns native vlan mismatch.

Review the access port's BPDU guard event, edge designation and the connected device's actual role. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It does not isolate the cause of the stated incident. The immediate problem concerns native vlan mismatch.

Set up compatible LACP participation on both ends and bundle only links with matching attributes. This instead concerns lacp mode compatibility. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. It would not implement the specifically required change. The immediate problem concerns native vlan mismatch.

Set up supported bridge priorities to place the intended core or distribution bridge as STP root for the affected instance. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not implement the specifically required change. The immediate problem concerns native vlan mismatch.

Keep edge BPDU guard for user-facing ports and move legitimate infrastructure bridges to appropriately managed uplinks. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not implement the specifically required change. The immediate problem concerns native vlan mismatch.

Confirm the negotiated aggregator and active collecting or distributing member set are stable under traffic. This instead concerns lacp mode compatibility. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. It would not establish that this function actually works. The immediate problem concerns native vlan mismatch.

Confirm stable root identity, forwarding and blocking states and lower topology-change event counts. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not establish that this function actually works. The immediate problem concerns native vlan mismatch.

Validate the edge port rejects the unexpected bridge while authorized end devices reconnect normally for the affected campus deployment. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not establish that this function actually works. The immediate problem concerns native vlan mismatch.

Review local and peer LACP mode, system IDs and member negotiation state. This instead concerns lacp mode compatibility. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns native vlan mismatch.

Set up supported bridge priorities to place the intended core or distribution bridge as STP root for the affected instance. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns native vlan mismatch.

Inspect spanning-tree root bridge IDs, priorities, path costs and instance membership. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It does not isolate the cause of the stated incident. The immediate problem concerns lacp mode compatibility.

Inspect the access port's BPDU guard event, edge designation and the connected device's actual role. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It does not isolate the cause of the stated incident. The immediate problem concerns lacp mode compatibility.

Inspect STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It does not isolate the cause of the stated incident. The immediate problem concerns lacp mode compatibility.

Configure supported bridge priorities to place the intended core or distribution bridge as STP root for the affected instance. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not implement the specifically required change. The immediate problem concerns lacp mode compatibility.

Retain edge BPDU guard for user-facing ports and move legitimate infrastructure bridges to appropriately managed uplinks. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not implement the specifically required change. The immediate problem concerns lacp mode compatibility.

Apply appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It would not implement the specifically required change. The immediate problem concerns lacp mode compatibility.

Verify stable root identity, forwarding and blocking states and lower topology-change event counts. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not establish that this function actually works. The immediate problem concerns lacp mode compatibility.

Validate the edge port rejects the unexpected bridge while authorized end devices reconnect normally. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not establish that this function actually works. The immediate problem concerns lacp mode compatibility.

Verify the faulted path remains safely blocked and converges correctly when valid BPDUs return. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It would not establish that this function actually works. The immediate problem concerns lacp mode compatibility.

Restore the approved bridge priorities and remove the misconfigured link if an unintended loop appears. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not safely roll back the relevant failed change. The immediate problem concerns lacp mode compatibility.

Remove the unauthorized bridge and clear the guard-triggered port fault only after verifying proper edge policy. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not safely roll back the relevant failed change. The immediate problem concerns lacp mode compatibility.

Restore the last safe STP protection settings and isolate the suspect optical path until the one-way fault is removed. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It would not safely roll back the relevant failed change. The immediate problem concerns lacp mode compatibility.