Spanning-Tree Operation

Configuring Rapid Reconfiguration Spanning Tree (RSTP)

Figure 5-4. 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

For the STP version of spanning tree, the rest of the information in this section does not apply. Refer to “802.1D Spanning-Tree Protocol (STP)” on page 5-23for more information on the STP version and its parameters.

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