User's Manual

Table Of Contents
196
Users Manual of GPL-8000
distributed to different STPs, creating multiple topologies in the network. In networks created by MSTP,
frames of different VLANs can be forwarded through different paths, realizing the load balance of the VLAN
data.
Different from the mechanism that VLAN distributes STP, MSTP allows multiple VLANs to be distributed to
one STP topology, effectively reducing STPs required to support lots of VLANs.
19.2.1.2 MST Domain
In MSTP, the relationship between VLAN and STP is described through the MSTP configuration table. MSTP
configuration table, configuration name and configuration edit number makes up of the MST configuration
identifier.
In the network, interconnected bridges with same MST configuration identifier are considered in the same
MST region. Bridges in the same MST region always have the same VLAN configuration, ensuring VLAN
frames are sent in the MST region.
19.2.1.3 IST, CST, CIST and MSTI
Figure 2.1 shows an MSTP network, including three MST regions and a switch running 802.1D STP.
Figure 2.1 MSTP topology