Spanning Tree Protocol (Stp); Protocol Overview - Dell S6100 Configuration Manual

The spanning tree protocol (STP) is supported on Dell Networking OS.
Topics:
•

Protocol Overview

• Configure Spanning Tree
• Important Points to Remember
• 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
• Selecting STP Root
• STP Root Guard
• Enabling SNMP Traps for Root Elections and Topology Changes
• Configuring Spanning Trees as Hitless
• STP Loop Guard
• Displaying STP Guard Configuration
Protocol Overview
STP is a Layer 2 protocol — specified by IEEE 802.1d — that eliminates loops in a bridged topology by enabling only a single path through
the network.
By eliminating loops, the protocol improves scalability in a large network and allows you to implement redundant paths, which can be
activated after the failure of active paths. Layer 2 loops, which can occur in a network due to poor network design and without enabling
protocols like xSTP, can cause unnecessarily high switch CPU utilization and memory consumption.
Dell Networking OS supports three other variations of spanning tree, as shown in the following table.
Table 106. Dell Networking OS Supported Spanning Tree Protocols
Dell Networking Term

Spanning Tree Protocol (STP)

Rapid Spanning Tree Protocol (RSTP)
Multiple Spanning Tree Protocol (MSTP)
Per-VLAN Spanning Tree Plus (PVST+)
864 Spanning Tree Protocol (STP)
Spanning Tree Protocol (STP)
IEEE Specification
802.1d
802.1w
802.1s
Third Party
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