RackSwitch G8000 Application Guide
Chapter 5: Spanning Tree
87BMD00041, November 2008
MSTP configuration guidelines
This section provides important information about configuring Multiple Spanning Tree
Groups:
When MSTP is turned on, the switch automatically moves all VLANs to the CIST.
When MSTP is turned off, the switch moves all VLANs from the CIST to STG 1.
When enabling MSTP, Region Name must be configured, and a default version number of
0 (zero) is configured automatically. Each bridge in the region must have the same name,
version number, and VLAN mapping.
Figure 5-3 shows how multiple Spanning Trees can provide redundancy without wasting any
uplink ports. In this example, the server ports are split between two separate VLANs. Both
VLANs belong to two different Multiple Spanning Tree (MSTP) groups. The Spanning Tree
priority values are configured so that each routing switch is the root for a different MSTP
instance. All of the uplinks are active, with each uplink port backing up the other.
