1.1 Why BPDU Tunneling
To avoid loops in your network, you can enable the spanning tree protocol (STP) on your device. However, STP gets aware of the topological structure of a network by means of bridge protocol data units (BPDUs) exchanged between different devices and the BPDUs are Layer 2 multicast packets, which can be received and processed by all STP-enabled devices on the network.
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