Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 580

www.dell.com | support.dell.com 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. 578 | Spanning Tree Protocol (STP)