HP Procurve 2650 Management And Configuration Manual page 317

802.1w Rapid Spanning Tree Protocol (RSTP) and 802.1d Spanning Tree Protocol (STP)
Figure 13-3. Example of the Spanning Tree Configuration Display
Enabling or Disabling RSTP. Issuing the command to enable spanning
tree on the switch implements, by default, the RSTP version of spanning tree
for all physical ports on the switch. Disabling spanning tree removes protec-
tion against redundant network paths.
Syntax: [no] spanning-tree
Abbreviation: [no] span
This command enables spanning tree with the current parameter settings or
disables spanning tree, using the "no" option, without losing the most-recently
configured parameter settings.
Enabling STP Instead of RSTP. If you decide, for whatever reason, that
you would prefer to run the IEEE 802.1d (STP) version of spanning tree, then
issue the following command:
Syntax: spanning-tree protocol-version stp
Abbreviation: span prot stp
Configuring Rapid Reconfiguration Spanning Tree (RSTP)
13-11