Consolidated Platform Configuration Guide, Cisco Ios Release 15.2(4)E (Catalyst 2960-X Switches - Cisco Catalyst 2960 series Configuration Manual

Configuring Spanning Tree Protocol
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Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and
feature information, see Bug Search Tool and the release notes for your platform and software release. To
find information about the features documented in this module, and to see a list of the releases in which each
feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support.
To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not
required.
Restrictions for STP
• An attempt to configure a switch as the root switch fails if the value necessary to be the root switch is
• If your network consists of switches that support and do not support the extended system ID, it is unlikely
• The root switch for each spanning-tree instance should be a backbone or distribution switch. Do not
Finding Feature Information, page 211
Restrictions for STP, page 211
Information About Spanning Tree Protocol, page 212
How to Configure Spanning-Tree Features, page 224
Monitoring Spanning-Tree Status, page 238
Feature Information for STP, page 239
less than 1.
that the switch with the extended system ID support will become the root switch. The extended system
ID increases the switch priority value every time the VLAN number is greater than the priority of the
connected switches running older software.
configure an access switch as the spanning-tree primary root.

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