(STP (SpanningTreeProtocol) is the abbreviation of Spanning Tree Protocol. It is a layer-2 management protocol, and it achieves the purpose of eliminating layer-2 loops in the network by selectively blocking redundant links in the network. However, according to the 802.1D specification, BPDUs do not carry VLANTAGs, and all bridges are required not to forward BPDUs; BPDUs with tags are illegal and cannot be guaranteed to be transparently transmitted on the public network. When the user wants a profile to include the following attachments:
Transparent transmission of private network STP on the public network.pdf
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