Cisco 400-151: CCIE Data Center Written Exam | Ports Affected by Enabling BPDU Guard Globally

Ports Affected by Enabling BPDU Guard Globally


Which ports are affected by enabling BPDU Guard globally?



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Enabling BPDU Guard globally affects operational spanning tree edge ports.

BPDU Guard is a feature in spanning tree protocol (STP) that protects the network from loops created by unauthorized switches that are connected to the network. When enabled on a port, BPDU Guard will shut down the port if it receives a BPDU (Bridge Protocol Data Unit) packet, which is sent by a switch to determine the root bridge in the network.

Operational spanning tree edge ports are ports that are connected to end devices and are not intended to participate in the STP. These ports are typically configured with the "spanning-tree port type edge" command to enable PortFast and BPDU Guard, which helps to prevent loops in the network caused by the insertion of unauthorized switches.

Therefore, when BPDU Guard is enabled globally, it affects operational spanning tree edge ports by shutting them down if they receive a BPDU packet. BPDU Guard has no effect on operational spanning tree network ports or normal ports that participate in the STP.