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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.
2. Add the VLANs that will share this MSTI on the MSTI Mapping page.
3. Enter the spanning tree priority for the CIST and selected MST instance on the MSTI
Priorities page.
Note: All VLANs are automatically added to the CIST (MST Instance 0).
To ensure that the MSTI maintains connectivity across the network, you must configure a
related set of bridges with the same MSTI settings.
PARAMETERS
Summary of Contents for GEP-1070
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