Cisco Switch Uplinkfast and Backbonefast

1. Uplinkfast: apply to trunk ports, should be configured only on access-layer switches.

# spanning-tree uplinkfast

2. Backbonefast:  should be configured on every switch in the network.

# spanning-tree backbonefast

3. Loop guard:  should be configured on two-switch-connected ports (trunk ports)

# spanning-tree loopguard default

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