Cisco Catalyst 2960 Series, Configuration Manual

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C H A P T E R
15
Configuring Spanning Tree Protocol
• 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
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
less than 1.
• If your network consists of switches that support and do not support the extended system ID, it is unlikely
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.
• The root switch for each spanning-tree instance should be a backbone or distribution switch. Do not
configure an access switch as the spanning-tree primary root.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
211