Table Of ContentBCMSN
Building Cisco
Multilayer Switched
Networks
Student Guide
Version 2.1
Copyright © 2003, Cisco Systems, Inc. Building Cisco Multilayer Switched Networks (BCMSN) v2.0 i
Copyright 2003, Cisco Systems, Inc. All rights reserved.
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ii Cisco IP Telephony (CIPT) v3.3 Copyright © 2003, Cisco Systems, Inc.
Table of Contents
Volume 1
Course Introduction 1
Overview 1
Outline 1
Course Objectives 2
Cisco Certifications 4
Learner Skills and Knowledge 5
Learner Responsibilities 6
General Administration 7
Course Flow Diagram 8
Icons and Symbols 9
Learner Introductions 10
Applying the Enterprise Composite Network Model to Ethernet Networks 1-1
Overview 1-1
Outline 1-2
Using Switching and Routing in Ethernet Networks 1-3
Overview 1-3
Relevance 1-3
Objectives 1-3
Learner Skills and Knowledge 1-4
Outline 1-4
Identifying the Communication Types in a Large Network 1-5
Discovering the Issues That Can Occur in an Unlayered Network 1-6
Identifying the Features of Layer 2 Switches 1-7
Discovering the Issues That Can Occur in a Layer 2 Network 1-8
Identifying the Features of Routers 1-9
Discovering the Issues That Can Occur in a Routed Network 1-10
Identifying the Features of Multilayer Switches 1-11
Discovering the Issues That Can Occur in a Poorly Designed Network 1-13
Summary 1-15
Quiz 1-16
Quiz Answer Key 1-18
Addressing Common Network Problems 1-19
Overview 1-19
Relevance 1-19
Objectives 1-19
Learner Skills and Knowledge 1-20
Outline 1-20
Identifying the Layers of a Hierarchical Network Model 1-21
Identifying the Functional Areas of the Enterprise Composite Network Model 1-22
Identifying the Features of the Enterprise Composite Network Model 1-23
Distinguishing the Modules of the Enterprise Campus Functional Areas 1-25
Distinguishing the Submodules in the Campus Infrastructure Module 1-26
Integrating Voice and Data in the Enterprise Composite Network Model 1-28
Summary 1-29
References 1-29
Quiz 1-30
Quiz Answer Key 1-32
Using Multilayer Switches in the Campus Infrastructure Module 1-33
Overview 1-33
Relevance 1-33
Objectives 1-33
Learner Skills and Knowledge 1-34
Outline 1-34
Identifying the Role of Multilayer Switches in the Building Access Submodule 1-35
Identifying the Role of Multilayer Switches in the Building Distribution Submodule 1-37
Identifying the Role of Multilayer Switches in the Building Core Submodule 1-38
Identifying the Role of Multilayer Switches in the Server Farm Module 1-39
Identifying the Role of Multilayer Switches in the Edge Distribution Module 1-40
Summary 1-41
References 1-41
Quiz 1-42
Quiz Answer Key 1-44
Using Data-Link Technologies in an Enterprise Composite Network Model 1-45
Overview 1-45
Relevance 1-45
Objectives 1-45
Learner Skills and Knowledge 1-46
Outline 1-46
Using Data Links to Interconnect Modules 1-47
Using Data Links to Interconnect the Building Access Layer 1-48
Using Data Links to Interconnect the Building Distribution Layer 1-50
Using Data Links to Interconnect the Building Core Layer 1-51
Summary 1-52
References 1-52
Next Steps 1-52
Quiz 1-53
Quiz Answer Key 1-54
Lesson Assessments 1-55
Overview 1-55
Outline 1-55
Quiz 1-1: Using Switching and Routing in Ethernet Networks 1-56
Objectives 1-56
Quiz 1-56
Scoring 1-57
Quiz 1-2: Addressing Common Network Problems 1-58
Objectives 1-58
Quiz 1-58
Scoring 1-61
Quiz 1-3: Using Multilayer Switches in the Campus Infrastructure Module 1-62
Objectives 1-62
Quiz 1-62
Scoring 1-62
Quiz 1-4: Using Data-Link Technologies in an Enterprise Composite Network Model 1-63
Objectives 1-63
Quiz 1-63
Scoring 1-64
Lesson Assessment Answer Key 1-65
Configuring VLANs and VTP 2-1
Overview 2-1
Outline 2-1
ii Building Cisco Multilayer Switched Networks (BCMSN) v2.1 Copyright © 2004, Cisco Systems, Inc.
Implementing VLANs 2-3
Overview 2-3
Relevance 2-3
Objectives 2-3
Learner Skills and Knowledge 2-4
Outline 2-4
Identifying the Features of a VLAN 2-5
Identifying the Benefits of a VLAN 2-6
Comparing VLAN Implementations 2-8
Implementing VLANs in the Enterprise Composite Network Model 2-10
Creating an Ethernet VLAN 2-11
Creating a VLAN in Global and Database Mode 2-12
Example: Creating a VLAN in Global Configuration Mode 2-13
Example: Creating a VLAN in VLAN Database Mode 2-15
Assigning Ports to a VLAN 2-16
Example: Assigning an Access Port to a VLAN 2-17
Verifying a VLAN Configuration 2-18
Example: Displaying Information about a VLAN by Number 2-19
Example: Displaying Information about a VLAN by Name 2-19
Verifying a VLAN Port Configuration 2-20
Example: Displaying Information About an Interface 2-20
Example: Displaying Detailed Switch Port Information 2-21
Example: Displaying MAC Address Table Information 2-21
Deleting a VLAN 2-22
Example: Deleting a VLAN in Global Configuration Mode 2-22
Troubleshooting VLAN Operations 2-24
Summary 2-26
References 2-27
Quiz 2-28
Quiz Answer Key 2-31
Supporting Multiple VLANs Between Two Switches 2-33
Overview 2-33
Relevance 2-33
Objectives 2-33
Learner Skills and Knowledge 2-34
Outline 2-34
Maintaining Specific VLAN Identification 2-35
Identifying the Features of Trunking Protocols 2-36
Identifying the Operational Mode of Switch Ports 2-38
Identifying the Modes for Dynamic Trunking Protocol 2-40
Summary 2-41
References 2-42
Quiz 2-43
Quiz Answer Key 2-45
Defining Trunking Protocols 2-47
Overview 2-47
Relevance 2-47
Objectives 2-47
Learner Skills and Knowledge 2-48
Outline 2-48
Comparing ISL and 802.1Q Trunking Protocols 2-49
Identifying the Features and Benefits of the ISL Protocol 2-50
Comparing the ISL and Layer 2 Encapsulation Processes 2-51
Identifying the Features and Benefits of 802.1Q Trunking 2-53
Comparing the 802.1Q Tagging Process and Layer 2 Encapsulation Protocol 2-54
Supporting Native VLANs 2-55
Copyright 2004, Cisco Systems, Inc. Building Cisco Multilayer Switched Networks (BCMSN) v2.1 iii
Mapping VLAN Ranges 2-57
Using Trunking Protocols in the Enterprise Composite Network Model 2-59
Summary 2-61
References 2-61
Quiz 2-62
Quiz Answer Key 2-64
Configuring Trunking Protocols 2-65
Overview 2-65
Relevance 2-65
Objectives 2-65
Learner Skills and Knowledge 2-66
Outline 2-66
Identifying the Procedure for Configuring Trunking Protocols 2-67
Configuring an ISL Trunk 2-68
Example: Configuring a Port for ISL Trunking 2-69
Verifying the ISL Trunk Configuration 2-70
Configuring an 802.1Q Trunk 2-71
Example: Configuring a Port for 802.1Q Trunking 2-72
Verifying the 802.1Q Trunk Configuration 2-73
Example: Displaying Port Information for 802.1Q Trunking 2-73
Example: Displaying Switch Port Information for 802.1Q Trunking 2-74
Example: Displaying Trunk Information for 802.1Q Trunking 2-74
Resolving Trunk Link Problems 2-75
Summary 2-76
References 2-76
Quiz 2-77
Quiz Answer Key 2-79
Maintaining VLAN Consistency Across the Network 2-81
Overview 2-81
Relevance 2-81
Objectives 2-81
Learner Skills and Knowledge 2-82
Outline 2-82
Defining VTP 2-83
Identifying VTP Modes 2-84
Sharing VLAN Attributes in a Management Domain 2-86
Controlling VLAN Traffic on a Trunk 2-88
Distinguishing Between VTP Versions 1 and 2 2-89
Identifying the Procedure for Configuring VTP 2-91
Creating a VTP Management Domain 2-92
Example: Configuring a Switch as a VTP Server 2-93
Verifying the VTP Configuration 2-94
Example: Displaying VTP Status 2-94
Example: Displaying VTP Statistics 2-96
Selecting a Troubleshooting Approach for VTP 2-97
Identifying How VTP Is Used in the Enterprise Composite Network Model 2-98
Summary 2-99
References 2-100
Next Steps 2-100
Quiz 2-101
Quiz Answer Key 2-104
Lesson Assessments 2-105
Overview 2-105
Outline 2-105
iv Building Cisco Multilayer Switched Networks (BCMSN) v2.1 Copyright © 2004, Cisco Systems, Inc.
Quiz 2-1: Implementing VLANs 2-106
Objectives 2-106
Quiz 2-106
Scoring 2-107
Quiz 2-2: Supporting Multiple VLANs Between Two Switches 2-108
Objectives 2-108
Quiz 2-108
Scoring 2-108
Quiz 2-3: Defining Trunking Protocols 2-109
Objectives 2-109
Quiz 2-109
Scoring 2-111
Quiz 2-4: Configuring Trunking Protocols 2-112
Objectives 2-112
Quiz 2-112
Scoring 2-113
Case Study 2-5: Maintaining VLAN Consistency Across the Network 2-114
Overview 2-114
Relevance 2-114
Objectives 2-114
Learner Skills and Knowledge 2-114
Job Aid 2-115
Outline 2-115
Case Study Verification 2-115
Presentation of Case Study 2-116
Lesson Assessment Answer Key 2-117
Implementing Spanning Tree Protocol 3-1
Overview 3-1
Outline 3-1
Preventing Bridging Loops Using Spanning Tree Protocol 3-3
Overview 3-3
Relevance 3-3
Objectives 3-3
Learner Skills and Knowledge 3-4
Outline 3-4
Identifying the Features of Transparent Bridging 3-5
Identifying Flooded Unicast Traffic 3-6
Example: Flooded Unicast Frames and Bridging Loops 3-6
Identifying Broadcast Traffic 3-7
Example: Broadcast Frames and Bridging Loops 3-7
Preventing Bridging Loops in a Redundant Network 3-9
Summary 3-10
References 3-10
Quiz 3-11
Quiz Answer Key 3-12
Defining Spanning Tree Protocol Operations 3-13
Overview 3-13
Relevance 3-13
Objectives 3-13
Learner Skills and Knowledge 3-14
Outline 3-14
Selecting the Root Switch 3-15
Distinguishing Between Bridge IDs 3-16
Determining the Forwarding Path 3-17
Example: Determining the Forward Path 3-17
Defining Spanning Tree Port Roles 3-18
Copyright 2004, Cisco Systems, Inc. Building Cisco Multilayer Switched Networks (BCMSN) v2.1 v
Using BPDU Messaging 3-19
Example: Learning Topology Changes Using BPDU Messaging 3-20
Identifying Selected BPDU Field Definitions 3-21
Transitioning from One STP State to Another 3-22
Identifying Spanning Tree Port States 3-24
Identifying Topology Changes 3-25
Example: Identifying Topology Changes 3-25
Summary 3-26
References 3-26
Quiz 3-27
Quiz Answer Key 3-31
Establishing a Loop-Free Topology in a New Network 3-33
Overview 3-33
Relevance 3-33
Objectives 3-33
Learner Skills and Knowledge 3-34
Outline 3-34
Identifying Root Bridge Criteria 3-35
Identifying Root Switch Process Steps 3-37
Selecting the Root 3-38
Forming an Association with the Root Switch 3-39
Selecting the Root Port 3-40
Example: Selecting the Root Port 3-40
Selecting the Designated Port 3-41
Comparing STP and Per VLAN Spanning Tree+ 3-42
Example: Comparing STP and PVST+ 3-42
Predicting STP Behavior in the Enterprise Composite Network Model 3-44
Summary 3-45
References 3-45
Quiz 3-46
Quiz Answer Key 3-49
Configuring Spanning Tree Protocol 3-51
Overview 3-51
Relevance 3-51
Objectives 3-51
Learner Skills and Knowledge 3-52
Outline 3-52
Enabling Spanning Tree 3-53
Example: Enabling Spanning Tree 3-53
Configuring the Root Bridge 3-54
Setting the Port Cost 3-55
Example: Changing the Spanning Tree Port Cost 3-56
Verifying the STP Configuration 3-57
Example: Verifying Spanning Tree 3-58
Example: Verifying a Spanning Tree Interface Configuration 3-59
Summary 3-61
References 3-61
Next Steps 3-61
Quiz 3-62
Quiz Answer Key 3-63
Lesson Assessments 3-65
Overview 3-65
Outline 3-65
vi Building Cisco Multilayer Switched Networks (BCMSN) v2.1 Copyright © 2004, Cisco Systems, Inc.
Quiz 3-1: Preventing Bridging Loops Using Spanning Tree Protocol 3-66
Objectives 3-66
Quiz 3-66
Scoring 3-67
Quiz 3-2: Defining Spanning Tree Protocol Operations 3-68
Objectives 3-68
Quiz 3-68
Scoring 3-69
Quiz 3-3: Establishing a Loop-Free Topology in a New Network 3-70
Objectives 3-70
Quiz 3-70
Scoring 3-71
Quiz 3-4: Configuring Spanning Tree Protocol 3-72
Objectives 3-72
Quiz 3-72
Scoring 3-73
Lesson Assessment Answer Key 3-74
Copyright 2004, Cisco Systems, Inc. Building Cisco Multilayer Switched Networks (BCMSN) v2.1 vii
viii Building Cisco Multilayer Switched Networks (BCMSN) v2.1 Copyright © 2004, Cisco Systems, Inc.
