White Papers

Table Of Contents
Removing an Interface from the Spanning Tree Group
Modifying Global Parameters
Modifying Interface STP Parameters
Enabling PortFast
Prevent Network Disruptions with BPDU Guard
STP Root Guard
SNMP Traps for Root Elections and Topology Changes
Important Points to Remember
STP is disabled by default.
The Dell Networking operating system (OS) supports only one spanning tree instance (0). For multiple instances, enable
the multiple spanning tree protocol (MSTP) or per-VLAN spanning tree plus (PVST+). You may only enable one flavor of
spanning tree 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
spanning tree topology at the time you enable the protocol.
To add interfaces to the spanning tree topology after you enable STP, enable the port and configure it for Layer 2 using the
switchport command.
The IEEE Standard 802.1D allows 8 bits for port ID and 8 bits for priority. The 8 bits for port ID provide port IDs for 256
ports.
768 Spanning Tree Protocol (STP)