C
HAPTER
4
| Configuring the Switch
Configuring the Spanning Tree Algorithm
– 122 –
Figure 44: STA Bridge Configuration
CONFIGURING
MULTIPLE SPANNING
TREES
Use the MSTI Mapping page to add VLAN groups to an MSTP instance
(MSTI), or to designate the name and revision of the VLAN-to-MSTI
mapping used on this switch.
PATH
Configuration, Spanning Tree, MSTI Mapping
COMMAND USAGE
MSTP generates a unique spanning tree for each instance. This provides
multiple pathways across the network, thereby balancing the traffic load,
preventing wide-scale disruption when a bridge node in a single instance
fails, and allowing for faster convergence of a new topology for the failed
instance.
By default all VLANs are assigned to the Common Internal Spanning Tree
(CIST, or MST Instance 0) that connects all bridges and LANs within the
MST region. This switch supports up to 7 instances. You should try to group
VLANs which cover the same general area of your network. However,
remember that you must configure all bridges that exist within the same
MSTI Region with the same set of instances, and the same instance (on
each bridge) with the same set of VLANs. Also, note that RSTP treats each
MSTI region as a single node, connecting all regions to the CIST.
To use multiple spanning trees:
1. Set the spanning tree type to MSTP (page 118).
2. Add the VLANs that will share this MSTI on the MSTI Mapping page.
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