Spanning tree
| show spanning-tree |
| list spanning tree information |
| conf t |
| enter into configuration mode |
| spanning-tree vlan 1 root primary |
| turn the switch primary for VLAN 1 |
| spanning-tree vlan 1 priority 0 |
| same result as above |
| spanning-tree vlan 1 root secondary |
| turn the switch secondary for VLAN 1 and re-negotiation started |
| int range fa0/1-2 |
| spanning-tree guard root |
| safeguards the connection to be over prioritized by a new STP connection |
| int fa0/3 |
| spanning-tree portfast |
| speed up the the access mode client connection, prevent long waiting time for spanning tree discover phase. Requirement that the switch port must be in access mode. |
| exit |
| spanning-tree mode rapid-pvst |
| adjust spanning-tree mode. Need to be set on each switches. |
| end |
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