Quick Reference Guide

Spanning Tree | 151
4. Verify the global configuration, the interface configuration, and the STP convergence. See Display
Spanning Tree Configuration on page 157.
5. (OPTIONAL) Influence the STP topology. See Influencing the Spanning Tree Topology on page 153
6. (OPTIONAL) Change global STP operational parameters. See Changing Spanning Tree Global
Parameters on page 155.
7. (OPTIONAL) Enable an edge port. See Enabling an Edge Port on page 156.
8. (OPTIONAL) Manage MSTP behavior. See MSTP Configuration Example on page 156.
Setting the STP Version Parameter
The Global Config mode command spanning-tree forceversion {802.1d | 802.1w | 802.1s} sets the protocol
Version parameter to a new value. The Force Protocol Version can be one of the following:
• 802.1d - STP BPDUs are transmitted rather than MST BPDUs (IEEE 802.1D functionality supported)
•
802.1w - RST BPDUs are transmitted rather than MST BPDUs (IEEE 802.1w functionality supported)
•
802.1s - MST BPDUs are transmitted (IEEE 802.1s functionality supported)
The
no spanning-tree forceversion command sets the Force Protocol Version parameter to the default value,
802.1s.
Note: The default spanning tree mode in SFTOS is IEEE 802.1s (MSTP), which is
backward-compatible with IEEE 802.1D and IEEE 802.1w. Those legacy modes are available in
SFTOS, as described below.
To change to the legacy IEEE 802.1D mode, set the STP operational mode to disabled, then enable
the IEEE 802.1D mode. With the IEEE 802.1D mode operationally enabled, the rapid
configuration and multiple instances features are not available. If the rapid configuration and
multiple instances capabilities are required, use the IEEE 802.1s mode.