What is bpdu

Normally, edge ports do not receive BPDUs. If forged BPDUs are sent to attack a device with edge ports and received by them, the device will automatically change the edge ports to non-edge ports and recalculate the spanning tree.

If the bridge priority in the BPDUs sent by an attacker is higher than the priority of the root bridge, the network topology will change, thereby interrupting service traffic. After BPDU protection is enabled on a switch, if an edge port on the switch receives a BPDU, the switch will shut down the edge port, while keeping the port attribute unchanged.

This ensures that the spanning tree topology is not recalculated and services are not interrupted. In addition, the switch generates the following log information and notifies the NMS of this event:. After the configuration is complete, run the display stp active command in any view to check the BPDU protection status based on the BPDU-Protection field in the command output. The branches Ethernet connections are then branched out from the root switch, connecting to other switches in the Local Area Network LAN.

All Bridges Switches are assigned a numerical value called bridge priority. If BPDU guard is the reason for the errdisable status, check these settings: Verify that the port using portfast is connected to an end station, not to a device that generates Spanning-Tree Protocol STP BPDU packets such as switches, bridges, or routers doing bridging.

The root guard feature of Cisco switches is designed to provide a way to enforce the placement of root bridges in the network. Root guard limits the switch ports out of which the root bridge may be negotiated. STP most commonly is used when performing calculations on gases, such as gas density. This is the freezing point of pure water at sea level atmospheric pressure.

The basic function of STP is to prevent bridge loops and the broadcast radiation that results from them. Displaying the BPDU guard status.

To display the BPDU guard state, enter the show running configuration or the show stp- bpdu - guard command. For the BPDU status enter the stp- bpdu - guard command. To enable bridge protocol data unit BPDU Guard by default on all spanning tree edge ports, use the spanning-tree port type edge bpduguard default command.

The BPDU guard feature can be globally enabled on the switch or can be enabled per port, but the feature operates with some differences. At the global level, you enable BPDU guard on Port Fast-enabled ports by using the spanning-tree portfast bpduguard default global configuration command.

First, you need to select an interface for which you want to enable or configure PortFast , and then execute the spanning-tree portfast command to enable this feature. As shown in the preceding figure, the PortFast feature will only have effect when the interface is in a non-trunking mode.

Errdisable is a feature that automatically disables a port on a Cisco Catalyst switch. When a port is error disabled, it is effectively shut down and no traffic is sent or received on that port.

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