Cisco STP (Spanning Tree Protocol) Configuration Lab, Stuff that a middle age man is still learning

Spanning Tree Troubleshooting

Identify the routing path of traffic
- Is there any HSRP
  - #show standby
- Check VLANs
  - #show vlan brief
- Which switch is the root switch and which ports are block ports
  - Check the spanning-tree details and find the root bridge
    - #show spanning-tree vlan [vlan#]
      - Summary and details of Root and Bridge ID and interface details
      - Verify all switches have matching spanning tree Root Bridge
      - Check Priority
Set switch as Span-tree Primary and Secondary
- Primary
  - (config)#spanning-tree vlan [vlan#] root primary
  - (config)#spanning-tree vlan [vlan#] root secondary
Portfast and bpduguard is set on an interfaces or can be set at default for all access ports
- Interface
  - (config)#int [interface]
  - (config-if)#spanning-tree portfast
  - (config-if)#spanning-tree bpduguard enable
- Default on all access ports
  - (config)# spanning-tree portfast bpduguard default