2021年12月27日 · BPDU Guard is a feature that defends the Layer 2 Spanning Tree Protocol (STP) topology against BPDU-related threats and is designed to protect the switching network. The BPDU guard feature must be activated on ports that should not receive BPDUs from connected devices.

2022年2月23日 · BPDU are the parts of the spanning tree protocol (STP). they allow the switches to obtain information about each other. The spanning tree protocol enabled the switches in redundant local area network need to exchange the information between each other for spanning tree protocol to work properly so, for the proper exchange of information between ...

2023年9月1日 · BPDU, or Bridge Protocol Data Unit, is a fundamental component in network topology for spanning tree protocol (STP). It is a specialized frame format used by bridges or switches to exchange information about network topology …

2024年10月18日 · BPDU是一种特定格式的数据包，它通过交换网桥（Bridge）之间进行通信，用于实现网桥协议（Bridge Protocol）的目的。BPDU中包含了有关网桥标识、端口状态和拓扑变化等信息，主要用于实现网桥的自学习和决策过程。

When you enable BPDU Guard feature on the access-ports, it shuts down the port that receives a BPDU. To bring up a port disabled by BDPU guard, you must remove the device and then restart the port by entering the shut/no shut command described later in this document.

2024年5月25日 · Understanding how Bridge Protocol Data Unit (BPDU) functions in network switches is essential for anyone involved in managing or designing network infrastructures. This foundational protocol helps maintain the stability and efficiency of network bridges and switches, particularly in environments using the Spanning Tree Protocol (STP).

本文详细介绍了STP（生成树协议）的基本概念、工作原理，包括BPDU报文的内容及其在选举根桥、根端口和指定端口过程中的作用。 此外，还讲解了MSTP（多生成树协议）的优势，如何配置MSTP以实现VLAN数据的负载均衡，并通过实例展示了MSTP配置步骤，以及如何在链路故障时确保网络连通性。 如图1所示，pc1和pc2通过交换机相连。 那么让我们回忆一下交换机之间的 通信原理，是需要通过ARP广播并记录MAC地址，那么sw1、sw2、sw3会将广播帧相互转 …

BPDUGuard helps to protect your spanning-tree topology. When an interface that has this enabled receives a BPDU, it will go into err-disabled mode.

BPDU protection is a security feature designed to protect the active STP topology by preventing spoofed BPDU packets from entering the STP domain. In a typical implementation, BPDU protection would be applied to edge ports connected to end user devices that do not run STP.

STP采用的协议报文是BPDU（Bridge Protocol Data Unit），也称为配置消息。 STP通过在设备间传递BPDU报文来确定网络的拓扑结构，并完成生成树的计算。 BPDU报文被封装在以太网数据帧中，目的MAC是组播MAC：01-80-C2-00-00-00。 STP协议的BPDU报文分为以下两种： 配置BPDU（Configuration BPDU）：用来进行生成树计算和维护生成树拓扑的报文。 TCN BPDU（Topology Change Notification BPDU）：拓扑变化通知BPDU，是在网络拓扑发生变化 …