1. Root Guard Parsing
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To protect the stability of the spanningtree, root guard configures the root bridge to specify the port or switch to the non-switch port, and when a better BPDU is received on the interface configured with root guard, the interface is blocked into the broken state. When not received more BPDUs are automatically recovered.
2. Configure Root Guard
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After configuring root guard, we access the S1 observation phenomenon
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74, the STP Security configuration experiment root Guard