TP-Link T1500G-10PS T1500G-10PSUN V1 User Guide - Page 95
BPDU Filter, Spanning Tree, STP Security, Port Protect
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BPDU Filter BPDU filter function is to prevent BPDUs flood in the STP network. If a switch receives malicious BPDUs, it forwards these BPDUs to the other switched in the network, which may result in spanning trees being continuously regenerated. In this case, the switch occupying too much CPU or the protocol status of BPDUs is wrong. With BPDU filter function enabled, a port does not receive or forward BPDUs, but it sends out its own BPDUs. Such a mechanism prevents the switch from being attacked by BPDUs so as to guarantee generation the spanning trees correct. Choose the menu Spanning Tree→STP Security→Port Protect to load the following page. Figure 7-10 Port Protect The following entries are displayed on this screen: Port Protect UNIT:1/LAGS: Select: Port: Loop Protect: Root Protect: TC Protect: Click 1 to configure the physical ports. Click LAGS to configure the link aggregation groups. Select the desired port for port protect configuration. It is multi-optional. Displays the port number of the switch. Loop Protect is to prevent the loops in the network brought by recalculating STP because of link failures and network congestions. Root Protect is to prevent wrong network topology change caused by the role change of the current legal root bridge. TC Protect is to prevent the decrease of the performance and stability of the switch brought by continuously removing MAC address entries upon receiving TC-BPDUs in the STP network. 85