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Per-VLAN Spanning Tree Plus
Per-VLAN Spanning Tree Plus is supported platforms: c e s
Port Monitoring is supported on the E-Series ExaScale platform with FTOS 8.1.1.0 and later.
Protocol Overview
Per-VLAN Spanning Tree Plus (PVST+) is a variation of Spanning Tree—developed by a third party—
that allows you to configure a separate Spanning Tree instance for each VLAN. For more information on
Spanning Tree, see Chapter 52, Spanning Tree Protocol.
Figure 40-1. Per-VLAN Spanning Tree
R2
R3
R1
2/32
1/22
1/32
2/12
3/22
3/12
STI 3: VLAN 300
STI 1: VLAN 100
STI 2: VLAN 200STI 2: VLAN 200
Forwarding
X
X
X
X
X
X
STI 1/2/3 root
Blocking