Configuration > 802.1D Spanning Tree

802.1D Spanning Tree Protocol (STP) implementation is designed to prevent network loops that could cause a broadcast storm. When physical links forming a loop provide redundancy, only a single path will be forwarding frames. If the link fails, STP activates a redundant link automatically.

Figure 37 – Configuration > Spanning Tree

By default, Spanning Tree is Disabled. If Enabled, the Switch will listen for BPDU packets and its accompanying Hello packet. BPDU packets are sent even if a BPDU packet was not received. Therefore, each link between bridges is sensitive to the status of the link. Ultimately this difference results in faster detection of failed links, and thus faster topology adjustment. A draw-back of 802.1D is this absence of immediate feedback from adjacent bridges.

After Enabling STP, setting the STP Global Setting includes the following options:

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Cisco Systems DGS-1224T manual Configuration 802.1D Spanning Tree, Configuration Spanning Tree