STP Configuration Option Summary
STP Defaults and Configuration Options:
| Setting | Default | Command(s) to Change Default |
|---|---|---|
| Bridge ID | Priority: 32,768 + VLAN ID System: A burned-in MAC on the switch | spanning-tree vlan vlan-id root {primary | secondary} then spanning-tree vlan vlan-id priority priority |
| Interface cost | 100 for 10Mbps, 19 for 100Mbps, 4 for 1 Gbps, 2 for 10 Gbps | spanning-tree vlan vlan-id cost cost |
| PortFast | Not enabled | spanning-tree portfast |
| BPDU Guard | Not enabled | spanning-tree bpduguard enable |
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