Motorola RFS7000 Series - Page 263

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Usage Guidelines
The mst > configuration command moves you to the Spanning Tree-MST Instance instance.
If a bridge does not hear bridge protocol data units (BPDUs) from the root bridge within the specified interval
defined in the max-age (seconds) parameter, assume the network has changed and recompute the spanning-
tree topology.
Example
RFS7000(config)#spanning-tree portfast bpduguard default
RFS7000(config)#