Configuring Pvstp; Enabling Pvstp; Fig. 8.25 Example Of Pvstp - SMC Networks 7824M/VSW - annexe 1 Manual

Management Guide
TigerAccess™ EE
8.3.8
8.3.8.1
SMC7824M/VSW

Configuring PVSTP

STP and RSPT are designed with one VLAN in the network. If a port becomes blocking
state, the physical port itself is blocked. But PVSTP (Per VLAN Spanning Tree Protocol)
and PVRSTP (Per VLAN Rapid Spanning Tree Protocol) maintains spanning tree in-
stance for each VLAN in the network. Because PVSTP treats each VLAN as a separate
network, it has the ability to load balance traffic by forwarding some VLANs on one trunk
and other VLANs. PVRSTP provides the same functionality as PVSTP with enhancement.
VLAN 3
Blocking
Switch B
Blocking
Fig. 8.25 Example of PVSTP
To configure PVSTP, use the following steps.
Step 1
Enable STP function using the spanning-tree command.
Step 2
Decide PVSTP mode using the spanning-tree mode rapid-pvst command.
Step 3
Enable PVSTP function using the spanning-tree vlan VLANS command.
Step 4
Configure detail options if specific commands are required.

Enabling PVSTP

To enable PVSTP function, use the following command.
Command
spanning-tree vlan VLANS
Switch A
Blocking
Switch C
Mode
Activates PVSTP function.
Bridge
VLANS: VLAN ID (1-4094)
VLAN 1
Switch D
VLAN 2
Description
CLI
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