578 | Spanning Tree Protocol (STP)
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Configuring Spanning Tree
Configuring STP is a two-step process:
1. Configure interfaces for Layer 2.
2. Enable STP.
Related Configuration Tasks
• Adding an Interface to the Spanning Tree Group
• Removing an Interface from the Spanning Tree Group
• Modifying Global Parameters
• Modifying Interface STP Parameters
• Enabling PortFast
• Preventing Network Disruptions with BPDU Guard
• STP Root Selection
• SNMP Traps for Root Elections and Topology Changes
Important Points to Remember
• STP is disabled by default.
• FTOS supports only one spanning tree instance (0). For multiple instances, you must enable MSTP or
PVST+. You can only enable one flavor of STP at any one time.
• All ports in virtual local area networks (VLANs) and all enabled interfaces in Layer 2 mode are
automatically added to the STP topology at the time you enable the protocol.
• After you enable STP, to add interfaces to the STP topology, enable the port and configure it for
Layer 2, then use the
switchport command.
• The IEEE Standard 802.1D allows eight bits for port ID and eight bits for priority. However, the eight
bits for port ID provide port IDs for only 256 ports.
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