Reference Guide

● Modifying Interface STP Parameters
● Enabling PortFast
● Prevent Network Disruptions with BPDU Guard
● STP Root Guard
● Enabling SNMP Traps for Root Elections and Topology Changes
Important Points to Remember
● STP is disabled by default.
● The Dell Networking 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.
730 Spanning Tree Protocol (STP)