
FUJITSU PSWITCH
User’s Guide
68
December/2018
3.1.2.8.2.
RSTP (Rapid Spanning Tree Protocol)
Rapid Spanning Tree Protocol (RSTP) detects and uses network topologies to
enable faster spanning tree convergence after a topology change, without creating
forwarding loops. The port settings supported by STP are also supported by RSTP.
3.1.2.8.3.
MSTP (Multiple Spanning Tree Protocol)
Multiple Spanning Tree (MSTP) operation maps VLANs to spanning tree instances.
Packets assigned to various VLANs are transmitted along different paths within
MSTP Regions (MST Regions). Regions are one or more interconnected MSTP
bridges with identical MSTP settings. The MSTP standard lets administrators assign
VLAN traffic to unique paths.
3.1.2.8.4.
MSTP in the Network
In the following diagram of a small 802.1D bridged network, STP is necessary to
create an environment with full connectivity and without loops.
Figure 3-4: STP in a Small Bridged Network
Assume that Switch A is elected to be the Root Bridge, and Port 1 on Switch B and
Switch C are calculated to be the root ports for those bridges, Port 2 on Switch B
and Switch C would be placed into the Blocking state. This creates a loop-free
topology. End stations in VLAN 10 can talk to other devices in VLAN 10, and end