Siemens S223 - Manual (Page 217)

User Manual UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5
A50010-Y3-C150-2-7619 217
8.3.6 Configuring PVSTP/PVRSTP
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.
Switch B
Switch C
Switch D
Switch A
VLAN 1
Blocking
VLAN 3
VLAN 2
Blocking
Blocking
Fig. 8.24 Example of PVSTP
8.3.6.1 Activating PVSTP/PVRSTP
To configure PVSTP or PVRSTP, configure force-version in order to decide the mode. In
order to decide force-version, use the following command.
Command Mode Description
stp pvst enable VLAN-RANGE Bridge
Activates PVSTP or PVRSTP function.
VLAN-RANGE : Vlan name
PVSTP is activated after selecting PVSTP in Force-version using the above command
and PVRSTP is activated after selecting PVRSTP using the above commands. In PVSTP
and PVRSTP, it is possible to configure only the current VLAN. If you input VLAN that
does not exist, error message is displayed.
For the switches in LAN where dual path doesn’t exist, Loop does not generate even
though STP function is not configured. To disable configured PVSTP, PVRSTP, use the
following command.
Command Mode Description
stp pvst disable Bridge Disables PVSTP or PVRSTP in VLAN.