Configuring Spanning Tree
Configuring STP is a two-step process:
1. Configure interfaces for Layer 2.
2. Enable STP.
Related Configuration Tasks
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Adding an Interface to the Spanning Tree Group
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Removing an Interface from the Spanning Tree Group
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Modifying Global Parameters
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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
•
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.
578
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Spanning Tree Protocol (STP)
command.
switchport