Configure Spanning Tree; Related Configuration Tasks; Important Points To Remember - Dell C9000 Series Networking Configuration Manual

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Table of Contents

Dell Networking Term

Per-VLAN Spanning Tree Plus (PVST+)

Configure Spanning Tree

Configuring spanning tree is a two-step process.

Configuring Interfaces for Layer 2 Mode

Enabling Spanning Tree Protocol Globally

Adding an Interface to the Spanning Tree Group

Modifying Global Parameters

Modifying Interface STP Parameters

Enabling PortFast

Prevent Network Disruptions with BPDU Guard

STP Root Guard

Enabling SNMP Traps for Root Elections and Topology Changes

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.

IEEE Specification

Spanning Tree Protocol (STP)