STP: Spanning tree Protocol, in order to prevent broadcast storms in a ring-switched network, logically disconnect a backup line, and when there is a problem with a line, the blocked port will automatically open and continue to work.
Root bridge: In a switched network there must be a root bridge, which controls the stability of the entire LAN, security, it is very important.
pvst+: A VLAN-enabled STP switching protocol for VLAN load balancing.
Ring networks, and STP:
When each line in the ring network is available, a network cable is logically broken
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When there is a problem with a physical line, its logical port is automatically opened to maintain network connectivity
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pvst+ configuration:
Configuring the master Switch
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2. Configuring the slave Switch
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3. pvst+ of query configuration
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Cisco STP Spanning Tree configuration