CCNP BCMSN Portable Command Guide

Chapter 3. STP and EtherChannel

This chapter provides information and commands concerning the following topics:

Spanning Tree Protocol

• Enabling Spanning Tree Protocol (STP)

• Configuring the root switch

• Configuring a secondary root switch

• Configuring port priority

• Configuring the path cost

• Configuring the switch priority of a VLAN

• Configuring STP timers

• Verifying STP

• Optional STP configurations

—PortFast

—BPDU Guard

—BPDU Filtering

—UplinkFast

—BackboneFast

—Root Guard

—Loop Guard

—Unidirectional Link Detection (UDLD)

• Changing the spanning-tree mode

• Extended System ID

• Enabling Rapid Spanning Tree

• Enabling Multiple Spanning Tree

• Verifying MST

• Troubleshooting STP

EtherChannel

• Interface modes in EtherChannel

—Without ...