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Lab 03Hands-on Lab

Implement RSTP & Advanced STP

Redundancy & STP

Goal

Run Rapid PVST+, control root election and port roles, and enable edge-port protections (PortFast/BPDU guard).

STPRSTPRapid PVST+PortFastBPDU GuardRoot Bridge
1

Implement RSTP & Advanced STP

Run Rapid PVST+, control root election and port roles, and enable edge-port protections (PortFast/BPDU guard).

R1#
configure terminal
spanning-tree mode rapid-pvst
end

Redundancy & STP

2

Switch to Rapid PVST+

Apply on S1, S2 and S3, then confirm the active protocol is rstp.

R1#
! S1
spanning-tree vlan 1 root primary
! S2
spanning-tree vlan 1 root secondary
3

Verify: show spanning-tree → "Spanning tree enabled protocol rstp".

Root Bridge Selection

R1#
interface g0/1
 spanning-tree vlan 1 port-priority 16
4

Make S1 root and S2 secondary (manual alternative: priority 4096 / 8192).

Port Roles via Priority

R1#
interface f0/6
 spanning-tree portfast edge
 spanning-tree bpduguard enable
5

To force a specific port to become root port (lowest port priority on a root-adjacent switch wins when cost ties).

R1#
show spanning-tree vlan 1          ! roles, states, protocol
show spanning-tree vlan 1 detail   ! timers, port states
show spanning-tree vlan 1 summary  ! count of edge ports
show interfaces trunk

Common Pitfalls