Cisco Systems 3750E User manual

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Catalyst 3750-E and 3560-E Switch

Software Configuration Guide

Cisco IOS Release 12.2(37)SE

May 2007

Text Part Number: OL-9775-02

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CONTENTS

Preface xliii

Audience xliii

Purpose xliii

Conventions xliii

Related Publications xliv

Obtaining Documentation, Obtaining Support, and Security Guidelines xlvi

CHAPTER

1 Overview 1-1

Features 1-1

Deployment Features 1-2

Performance Features 1-4

Management Options 1-5

Manageability Features 1-6

Availability and Redundancy Features 1-7

VLAN Features 1-8

Security Features 1-8

QoS and CoS Features 1-10

Layer 3 Features 1-11

Power over Ethernet Features 1-12

Monitoring Features 1-13

Default Settings After Initial Switch Configuration 1-13

Network Configuration Examples 1-16

Design Concepts for Using the Switch 1-16

Small to Medium-Sized Network Using Catalyst 3750-E and 3560-E Switches 1-23

Large Network Using Catalyst 3750-E and 3560-E Switches 1-26

Multidwelling Network Using Catalyst 3750-E Switches 1-29

Long-Distance, High-Bandwidth Transport Configuration 1-30

Where to Go Next 1-31

CHAPTER

2 Using the Command-Line Interface 2-1

Understanding Command Modes 2-1

Understanding the Help System 2-3

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Understanding Abbreviated Commands 2-4

Understanding no and default Forms of Commands 2-4

Understanding CLI Error Messages 2-5

Using Configuration Logging 2-5

Using Command History 2-6

Changing the Command History Buffer Size 2-6

Recalling Commands 2-6

Disabling the Command History Feature 2-7

Using Editing Features 2-7

Enabling and Disabling Editing Features 2-7

Editing Commands through Keystrokes 2-8

Editing Command Lines that Wrap 2-9

Searching and Filtering Output of show and more Commands 2-10

Accessing the CLI 2-10

Accessing the CLI through a Console Connection or through Telnet 2-11

CHAPTER

3 Assigning the Switch IP Address and Default Gateway 3-1

Understanding the Boot Process 3-1

Assigning Switch Information 3-2

Default Switch Information 3-3

Understanding DHCP-Based Autoconfiguration 3-3

DHCP Client Request Process 3-4

Configuring DHCP-Based Autoconfiguration 3-5

DHCP Server Configuration Guidelines 3-5

Configuring the TFTP Server 3-6

Configuring the DNS 3-6

Configuring the Relay Device 3-7

Obtaining Configuration Files 3-7

Example Configuration 3-8

Manually Assigning IP Information 3-10

Checking and Saving the Running Configuration 3-11

Modifying the Startup Configuration 3-12

Default Boot Configuration 3-12

Automatically Downloading a Configuration File 3-12

Specifying the Filename to Read and Write the System Configuration 3-12

Booting Manually 3-13

Booting a Specific Software Image 3-14

Controlling Environment Variables 3-15

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Scheduling a Reload of the Software Image 3-17

Configuring a Scheduled Reload 3-17

Displaying Scheduled Reload Information 3-18

CHAPTER

4 Configuring Cisco IOS CNS Agents 4-1

Understanding Cisco Configuration Engine Software 4-1

Configuration Service 4-2

Event Service 4-3

NameSpace Mapper 4-3

What You Should Know About the CNS IDs and Device Hostnames 4-3

ConfigID 4-3

DeviceID 4-4

Hostname and DeviceID 4-4

Using Hostname, DeviceID, and ConfigID 4-4

Understanding Cisco IOS Agents 4-5

Initial Configuration 4-5

Incremental (Partial) Configuration 4-6

Synchronized Configuration 4-6

Configuring Cisco IOS Agents 4-6

Enabling Automated CNS Configuration 4-6

Enabling the CNS Event Agent 4-8

Enabling the Cisco IOS CNS Agent 4-9

Enabling an Initial Configuration 4-9

Enabling a Partial Configuration 4-11

Displaying CNS Configuration 4-12

CHAPTER

5 Managing Switch Stacks 5-1

Understanding Switch Stacks 5-1

Switch Stack Membership 5-3

Stack Master Election and Re-Election 5-5

Switch Stack Bridge ID and Router MAC Address 5-6

Stack Member Numbers 5-6

Stack Member Priority Values 5-7

Switch Stack Offline Configuration 5-8

Effects of Adding a Provisioned Switch to a Switch Stack 5-8

Effects of Replacing a Provisioned Switch in a Switch Stack 5-10

Effects of Removing a Provisioned Switch from a Switch Stack 5-10

Hardware Compatibility and SDM Mismatch Mode in Switch Stacks 5-10

Switch Stack Software Compatibility Recommendations 5-10

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Stack Protocol Version Compatibility 5-11

Major Version Number Incompatibility Among Switches 5-11

Minor Version Number Incompatibility Among Switches 5-11

Understanding Auto-Upgrade and Auto-Advise 5-12

Auto-Upgrade and Auto-Advise Example Messages 5-13

Incompatible Software and Stack Member Image Upgrades 5-15

Switch Stack Configuration Files 5-15

Additional Considerations for System-Wide Configuration on Switch Stacks 5-16

Switch Stack Management Connectivity 5-16

Connectivity to the Switch Stack Through an IP Address 5-17

Connectivity to the Switch Stack Through an SSH Session 5-17

Connectivity to the Switch Stack Through Console Ports or Ethernet Management Ports 5-17

Connectivity to Specific Stack Members 5-17

Switch Stack Configuration Scenarios 5-18

Configuring the Switch Stack 5-20

Default Switch Stack Configuration 5-20

Enabling Persistent MAC Address 5-20

Assigning Stack Member Information 5-22

Assigning a Stack Member Number 5-22

Setting the Stack Member Priority Value 5-22

Provisioning a New Member for a Switch Stack 5-23

Accessing the CLI of a Specific Stack Member 5-24

Displaying Switch Stack Information 5-24

CHAPTER

6 Clustering Switches 6-1

Understanding Switch Clusters 6-1

Cluster Command Switch Characteristics 6-3

Standby Cluster Command Switch Characteristics 6-3

Candidate Switch and Cluster Member Switch Characteristics 6-4

Planning a Switch Cluster 6-4

Automatic Discovery of Cluster Candidates and Members 6-5

Discovery Through CDP Hops 6-5

Discovery Through Non-CDP-Capable and Noncluster-Capable Devices 6-6

Discovery Through Different VLANs 6-7

Discovery Through Different Management VLANs 6-8

Discovery Through Routed Ports 6-9

Discovery of Newly Installed Switches 6-10

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HSRP and Standby Cluster Command Switches 6-11

Virtual IP Addresses 6-12

Other Considerations for Cluster Standby Groups 6-12

Automatic Recovery of Cluster Configuration 6-13

IP Addresses 6-14

Hostnames 6-14

Passwords 6-15

SNMP Community Strings 6-15

Switch Clusters and Switch Stacks 6-16

TACACS+ and RADIUS 6-17

LRE Profiles 6-17

Using the CLI to Manage Switch Clusters 6-18

Catalyst 1900 and Catalyst 2820 CLI Considerations 6-18

Using SNMP to Manage Switch Clusters 6-19

CHAPTER

7 Administering the Switch 7-1

Managing the System Time and Date 7-1

Understanding the System Clock 7-1

Understanding Network Time Protocol 7-2

Configuring NTP 7-3

Default NTP Configuration 7-4

Configuring NTP Authentication 7-4

Configuring NTP Associations 7-5

Configuring NTP Broadcast Service 7-6

Configuring NTP Access Restrictions 7-8

Configuring the Source IP Address for NTP Packets 7-10

Displaying the NTP Configuration 7-11

Configuring Time and Date Manually 7-11

Setting the System Clock 7-11

Displaying the Time and Date Configuration 7-12

Configuring the Time Zone 7-12

Configuring Summer Time (Daylight Saving Time) 7-13

Configuring a System Name and Prompt 7-14

Default System Name and Prompt Configuration 7-15

Configuring a System Name 7-15

Understanding DNS 7-15

Default DNS Configuration 7-16

Setting Up DNS 7-16

Displaying the DNS Configuration 7-17

Contents

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Creating a Banner 7-17

Default Banner Configuration 7-17

Configuring a Message-of-the-Day Login Banner 7-18

Configuring a Login Banner 7-19

Managing the MAC Address Table 7-19

Building the Address Table 7-20

MAC Addresses and VLANs 7-20

MAC Addresses and Switch Stacks 7-21

Default MAC Address Table Configuration 7-21

Changing the Address Aging Time 7-21

Removing Dynamic Address Entries 7-22

Configuring MAC Address Notification Traps 7-22

Adding and Removing Static Address Entries 7-24

Configuring Unicast MAC Address Filtering 7-25

Displaying Address Table Entries 7-27

Managing the ARP Table 7-27

CHAPTER

8 Configuring SDM Templates 8-1

Understanding the SDM Templates 8-1

Dual IPv4 and IPv6 SDM Templates 8-2

SDM Templates and Switch Stacks 8-3

Configuring the Switch SDM Template 8-4

Default SDM Template 8-4

SDM Template Configuration Guidelines 8-4

Setting the SDM Template 8-5

Displaying the SDM Templates 8-6

CHAPTER

9 Configuring Switch-Based Authentication 9-1

Preventing Unauthorized Access to Your Switch 9-1

Protecting Access to Privileged EXEC Commands 9-2

Default Password and Privilege Level Configuration 9-2

Setting or Changing a Static Enable Password 9-3

Protecting Enable and Enable Secret Passwords with Encryption 9-3

Disabling Password Recovery 9-5

Setting a Telnet Password for a Terminal Line 9-6

Configuring Username and Password Pairs 9-6

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Configuring Multiple Privilege Levels 9-7

Setting the Privilege Level for a Command 9-8

Changing the Default Privilege Level for Lines 9-9

Logging into and Exiting a Privilege Level 9-9

Controlling Switch Access with TACACS+ 9-10

Understanding TACACS+ 9-10

TACACS+ Operation 9-12

Configuring TACACS+ 9-12

Default TACACS+ Configuration 9-13

Identifying the TACACS+ Server Host and Setting the Authentication Key 9-13

Configuring TACACS+ Login Authentication 9-14

Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services 9-16

Starting TACACS+ Accounting 9-17

Displaying the TACACS+ Configuration 9-17

Controlling Switch Access with RADIUS 9-17

Understanding RADIUS 9-18

RADIUS Operation 9-19

Configuring RADIUS 9-20

Default RADIUS Configuration 9-20

Identifying the RADIUS Server Host 9-20

Configuring RADIUS Login Authentication 9-23

Defining AAA Server Groups 9-25

Configuring RADIUS Authorization for User Privileged Access and Network Services 9-27

Starting RADIUS Accounting 9-28

Configuring Settings for All RADIUS Servers 9-29

Configuring the Switch to Use Vendor-Specific RADIUS Attributes 9-29

Configuring the Switch for Vendor-Proprietary RADIUS Server Communication 9-30

Displaying the RADIUS Configuration 9-31

Controlling Switch Access with Kerberos 9-31

Understanding Kerberos 9-32

Kerberos Operation 9-34

Authenticating to a Boundary Switch 9-34

Obtaining a TGT from a KDC 9-35

Authenticating to Network Services 9-35

Configuring Kerberos 9-35

Configuring the Switch for Local Authentication and Authorization 9-36

Contents

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Configuring the Switch for Secure Shell 9-37

Understanding SSH 9-38

SSH Servers, Integrated Clients, and Supported Versions 9-38

Limitations 9-39

Configuring SSH 9-39

Configuration Guidelines 9-39

Setting Up the Switch to Run SSH 9-40

Configuring the SSH Server 9-41

Displaying the SSH Configuration and Status 9-41

Configuring the Switch for Secure Socket Layer HTTP 9-42

Understanding Secure HTTP Servers and Clients 9-42

Certificate Authority Trustpoints 9-42

CipherSuites 9-44

Configuring Secure HTTP Servers and Clients 9-44

Default SSL Configuration 9-44

SSL Configuration Guidelines 9-45

Configuring a CA Trustpoint 9-45

Configuring the Secure HTTP Server 9-46

Configuring the Secure HTTP Client 9-47

Displaying Secure HTTP Server and Client Status 9-48

Configuring the Switch for Secure Copy Protocol 9-48

Information About Secure Copy 9-49

CHAPTER

10 Configuring IEEE 802.1x Port-Based Authentication 10-1

Understanding IEEE 802.1x Port-Based Authentication 10-1

Device Roles 10-2

Authentication Process 10-3

Authentication Initiation and Message Exchange 10-5

Ports in Authorized and Unauthorized States 10-7

IEEE 802.1x Authentication and Switch Stacks 10-7

IEEE 802.1x Host Mode 10-8

IEEE 802.1x Accounting 10-9

IEEE 802.1x Accounting Attribute-Value Pairs 10-9

Using IEEE 802.1x Authentication with VLAN Assignment 10-10

Using IEEE 802.1x Authentication with Per-User ACLs 10-11

Using IEEE 802.1x Authentication with Guest VLAN 10-12

Using IEEE 802.1x Authentication with Restricted VLAN 10-13

Using IEEE 802.1x Authentication with Inaccessible Authentication Bypass 10-14

Using IEEE 802.1x Authentication with Voice VLAN Ports 10-15

Contents

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Using IEEE 802.1x Authentication with Port Security 10-16

Using IEEE 802.1x Authentication with Wake-on-LAN 10-17

Using IEEE 802.1x Authentication with MAC Authentication Bypass 10-17

Network Admission Control Layer 2 IEEE 802.1x Validation 10-19

Using Multidomain Authentication 10-19

Using Web Authentication 10-20

Configuring IEEE 802.1x Authentication 10-21

Default IEEE 802.1x Authentication Configuration 10-22

IEEE 802.1x Authentication Configuration Guidelines 10-23

IEEE 802.1x Authentication 10-23

VLAN Assignment, Guest VLAN, Restricted VLAN, and Inaccessible Authentication

Bypass

10-24

MAC Authentication Bypass 10-25

Configuring IEEE 802.1x Authentication 10-25

Configuring the Switch-to-RADIUS-Server Communication 10-26

Configuring the Host Mode 10-28

Configuring Periodic Re-Authentication 10-29

Manually Re-Authenticating a Client Connected to a Port 10-29

Changing the Quiet Period 10-30

Changing the Switch-to-Client Retransmission Time 10-30

Setting the Switch-to-Client Frame-Retransmission Number 10-31

Setting the Re-Authentication Number 10-32

Configuring IEEE 802.1x Accounting 10-32

Configuring a Guest VLAN 10-33

Configuring a Restricted VLAN 10-34

Configuring the Inaccessible Authentication Bypass Feature 10-36

Configuring IEEE 802.1x Authentication with WoL 10-38

Configuring MAC Authentication Bypass 10-39

Configuring NAC Layer 2 IEEE 802.1x Validation 10-40

Configuring Web Authentication 10-41

Disabling IEEE 802.1x Authentication on the Port 10-43

Resetting the IEEE 802.1x Authentication Configuration to the Default Values 10-44

Displaying IEEE 802.1x Statistics and Status 10-44

Contents

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CHAPTER

11 Configuring Interface Characteristics 11-1

Understanding Interface Types 11-1

Port-Based VLANs 11-2

Switch Ports 11-2

Access Ports 11-3

Trunk Ports 11-3

Tunnel Ports 11-4

Routed Ports 11-4

Switch Virtual Interfaces 11-5

EtherChannel Port Groups 11-5

10-Gigabit Ethernet Interfaces 11-6

Power over Ethernet Ports 11-6

Supported Protocols and Standards 11-6

Powered-Device Detection and Initial Power Allocation 11-7

Power Management Modes 11-8

Power Monitoring and Power Policing 11-9

Connecting Interfaces 11-11

Ethernet Management Port 11-12

Using Interface Configuration Mode 11-15

Procedures for Configuring Interfaces 11-16

Configuring a Range of Interfaces 11-17

Configuring and Using Interface Range Macros 11-19

Configuring Ethernet Interfaces 11-20

Default Ethernet Interface Configuration 11-21

Configuring Interface Speed and Duplex Mode 11-22

Speed and Duplex Configuration Guidelines 11-22

Setting the Interface Speed and Duplex Parameters 11-23

Configuring IEEE 802.3x Flow Control 11-24

Configuring Auto-MDIX on an Interface 11-25

Configuring a Power Management Mode on a PoE Port 11-26

Budgeting Power for Devices Connected to a PoE Port 11-27

Configuring Power Policing 11-29

Adding a Description for an Interface 11-30

Configuring Ethernet Management Ports 11-31

Configuring Layer 3 Interfaces 11-31

Configuring the System MTU 11-33

Configuring the Cisco Redundant Power System 2300 11-35

Contents

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Configuring the Power Supplies 11-37

Monitoring and Maintaining the Interfaces 11-38

Monitoring Interface Status 11-38

Clearing and Resetting Interfaces and Counters 11-39

Shutting Down and Restarting the Interface 11-40

CHAPTER

12 Configuring Smartports Macros 12-1

Understanding Smartports Macros 12-1

Configuring Smartports Macros 12-2

Default Smartports Macro Configuration 12-2

Smartports Macro Configuration Guidelines 12-3

Creating Smartports Macros 12-4

Applying Smartports Macros 12-5

Applying Cisco-Default Smartports Macros 12-6

Displaying Smartports Macros 12-8

CHAPTER

13 Configuring VLANs 13-1

Understanding VLANs 13-1

Supported VLANs 13-3

VLAN Port Membership Modes 13-3

Configuring Normal-Range VLANs 13-4

Token Ring VLANs 13-6

Normal-Range VLAN Configuration Guidelines 13-6

VLAN Configuration Mode Options 13-7

VLAN Configuration in config-vlan Mode 13-7

VLAN Configuration in VLAN Database Configuration Mode 13-7

Saving VLAN Configuration 13-7

Default Ethernet VLAN Configuration 13-8

Creating or Modifying an Ethernet VLAN 13-9

Deleting a VLAN 13-10

Assigning Static-Access Ports to a VLAN 13-11

Configuring Extended-Range VLANs 13-12

Default VLAN Configuration 13-12

Extended-Range VLAN Configuration Guidelines 13-13

Creating an Extended-Range VLAN 13-14

Creating an Extended-Range VLAN with an Internal VLAN ID 13-15

Displaying VLANs 13-16

Configuring VLAN Trunks 13-16

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Trunking Overview 13-16

Encapsulation Types 13-18

IEEE 802.1Q Configuration Considerations 13-19

Default Layer 2 Ethernet Interface VLAN Configuration 13-19

Configuring an Ethernet Interface as a Trunk Port 13-19

Interaction with Other Features 13-20

Configuring a Trunk Port 13-20

Defining the Allowed VLANs on a Trunk 13-21

Changing the Pruning-Eligible List 13-22

Configuring the Native VLAN for Untagged Traffic 13-23

Configuring Trunk Ports for Load Sharing 13-24

Load Sharing Using STP Port Priorities 13-24

Load Sharing Using STP Path Cost 13-26

Configuring VMPS 13-28

Understanding VMPS 13-28

Dynamic-Access Port VLAN Membership 13-29

Default VMPS Client Configuration 13-29

VMPS Configuration Guidelines 13-29

Configuring the VMPS Client 13-30

Entering the IP Address of the VMPS 13-30

Configuring Dynamic-Access Ports on VMPS Clients 13-31

Reconfirming VLAN Memberships 13-31

Changing the Reconfirmation Interval 13-32

Changing the Retry Count 13-32

Monitoring the VMPS 13-33

Troubleshooting Dynamic-Access Port VLAN Membership 13-33

VMPS Configuration Example 13-33

CHAPTER

14 Configuring VTP 14-1

Understanding VTP 14-1

The VTP Domain 14-2

VTP Modes 14-3

VTP Advertisements 14-3

VTP Version 2 14-4

VTP Pruning 14-4

VTP and Switch Stacks 14-6

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Configuring VTP 14-6

Default VTP Configuration 14-7

VTP Configuration Options 14-7

VTP Configuration in Global Configuration Mode 14-7

VTP Configuration in VLAN Database Configuration Mode 14-8

VTP Configuration Guidelines 14-8

Domain Names 14-8

Passwords 14-8

VTP Version 14-9

Configuration Requirements 14-9

Configuring a VTP Server 14-9

Configuring a VTP Client 14-11

Disabling VTP (VTP Transparent Mode) 14-12

Enabling VTP Version 2 14-13

Enabling VTP Pruning 14-14

Adding a VTP Client Switch to a VTP Domain 14-14

Monitoring VTP 14-16

CHAPTER

15 Configuring Voice VLAN 15-1

Understanding Voice VLAN 15-1

Cisco IP Phone Voice Traffic 15-2

Cisco IP Phone Data Traffic 15-2

Configuring Voice VLAN 15-3

Default Voice VLAN Configuration 15-3

Voice VLAN Configuration Guidelines 15-3

Configuring a Port Connected to a Cisco 7960 IP Phone 15-4

Configuring Cisco IP Phone Voice Traffic 15-5

Configuring the Priority of Incoming Data Frames 15-6

Displaying Voice VLAN 15-7

CHAPTER

16 Configuring Private VLANs 16-1

Understanding Private VLANs 16-1

IP Addressing Scheme with Private VLANs 16-3

Private VLANs across Multiple Switches 16-4

Private-VLAN Interaction with Other Features 16-4

Private VLANs and Unicast, Broadcast, and Multicast Traffic 16-5

Private VLANs and SVIs 16-5

Private VLANs and Switch Stacks 16-6

Contents

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Configuring Private VLANs 16-6

Tasks for Configuring Private VLANs 16-6

Default Private-VLAN Configuration 16-7

Private-VLAN Configuration Guidelines 16-7

Secondary and Primary VLAN Configuration 16-7

Private-VLAN Port Configuration 16-8

Limitations with Other Features 16-9

Configuring and Associating VLANs in a Private VLAN 16-10

Configuring a Layer 2 Interface as a Private-VLAN Host Port 16-12

Configuring a Layer 2 Interface as a Private-VLAN Promiscuous Port 16-13

Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface 16-14

Monitoring Private VLANs 16-15

CHAPTER

17 Configuring IEEE 802.1Q and Layer 2 Protocol Tunneling 17-1

Understanding IEEE 802.1Q Tunneling 17-1

Configuring IEEE 802.1Q Tunneling 17-4

Default IEEE 802.1Q Tunneling Configuration 17-4

IEEE 802.1Q Tunneling Configuration Guidelines 17-4

Native VLANs 17-4

System MTU 17-5

IEEE 802.1Q Tunneling and Other Features 17-6

Configuring an IEEE 802.1Q Tunneling Port 17-7

Understanding Layer 2 Protocol Tunneling 17-8

Configuring Layer 2 Protocol Tunneling 17-10

Default Layer 2 Protocol Tunneling Configuration 17-11

Layer 2 Protocol Tunneling Configuration Guidelines 17-12

Configuring Layer 2 Protocol Tunneling 17-13

Configuring Layer 2 Tunneling for EtherChannels 17-14

Configuring the SP Edge Switch 17-14

Configuring the Customer Switch 17-16

Monitoring and Maintaining Tunneling Status 17-18

CHAPTER

18 Configuring STP 18-1

Understanding Spanning-Tree Features 18-1

STP Overview 18-2

Spanning-Tree Topology and BPDUs 18-3

Contents

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Bridge ID, Switch Priority, and Extended System ID 18-4

Spanning-Tree Interface States 18-5

Blocking State 18-7

Listening State 18-7

Learning State 18-7

Forwarding State 18-7

Disabled State 18-8

How a Switch or Port Becomes the Root Switch or Root Port 18-8

Spanning Tree and Redundant Connectivity 18-9

Spanning-Tree Address Management 18-9

Accelerated Aging to Retain Connectivity 18-9

Spanning-Tree Modes and Protocols 18-10

Supported Spanning-Tree Instances 18-10

Spanning-Tree Interoperability and Backward Compatibility 18-11

STP and IEEE 802.1Q Trunks 18-11

VLAN-Bridge Spanning Tree 18-11

Spanning Tree and Switch Stacks 18-12

Configuring Spanning-Tree Features 18-12

Default Spanning-Tree Configuration 18-13

Spanning-Tree Configuration Guidelines 18-13

Changing the Spanning-Tree Mode. 18-15

Disabling Spanning Tree 18-16

Configuring the Root Switch 18-16

Configuring a Secondary Root Switch 18-18

Configuring Port Priority 18-18

Configuring Path Cost 18-20

Configuring the Switch Priority of a VLAN 18-21

Configuring Spanning-Tree Timers 18-22

Configuring the Hello Time 18-22

Configuring the Forwarding-Delay Time for a VLAN 18-23

Configuring the Maximum-Aging Time for a VLAN 18-23

Configuring the Transmit Hold-Count 18-24

Displaying the Spanning-Tree Status 18-24

Contents

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CHAPTER

19 Configuring MSTP 19-1

Understanding MSTP 19-2

Multiple Spanning-Tree Regions 19-2

IST, CIST, and CST 19-3

Operations Within an MST Region 19-3

Operations Between MST Regions 19-4

IEEE 802.1s Terminology 19-5

Hop Count 19-5

Boundary Ports 19-6

IEEE 802.1s Implementation 19-6

Port Role Naming Change 19-7

Interoperation Between Legacy and Standard Switches 19-7

Detecting Unidirectional Link Failure 19-8

MSTP and Switch Stacks 19-8

Interoperability with IEEE 802.1D STP 19-9

Understanding RSTP 19-9

Port Roles and the Active Topology 19-9

Rapid Convergence 19-10

Synchronization of Port Roles 19-11

Bridge Protocol Data Unit Format and Processing 19-12

Processing Superior BPDU Information 19-13

Processing Inferior BPDU Information 19-13

Topology Changes 19-13

Configuring MSTP Features 19-14

Default MSTP Configuration 19-15

MSTP Configuration Guidelines 19-15

Specifying the MST Region Configuration and Enabling MSTP 19-16

Configuring the Root Switch 19-17

Configuring a Secondary Root Switch 19-19

Configuring Port Priority 19-20

Configuring Path Cost 19-21

Configuring the Switch Priority 19-22

Configuring the Hello Time 19-22

Configuring the Forwarding-Delay Time 19-23

Configuring the Maximum-Aging Time 19-24

Configuring the Maximum-Hop Count 19-24

Contents

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Catalyst 3750-E and 3560-E Switch Software Configuration Guide

OL-9775-02

Specifying the Link Type to Ensure Rapid Transitions 19-24

Designating the Neighbor Type 19-25

Restarting the Protocol Migration Process 19-26

Displaying the MST Configuration and Status 19-26

CHAPTER

20 Configuring Optional Spanning-Tree Features 20-1

Understanding Optional Spanning-Tree Features 20-1

Understanding Port Fast 20-2

Understanding BPDU Guard 20-2

Understanding BPDU Filtering 20-3

Understanding UplinkFast 20-3

Understanding Cross-Stack UplinkFast 20-5

How CSUF Works 20-6

Events that Cause Fast Convergence 20-7

Understanding BackboneFast 20-7

Understanding EtherChannel Guard 20-10

Understanding Root Guard 20-10

Understanding Loop Guard 20-11

Configuring Optional Spanning-Tree Features 20-11

Default Optional Spanning-Tree Configuration 20-12

Optional Spanning-Tree Configuration Guidelines 20-12

Enabling Port Fast 20-12

Enabling BPDU Guard 20-13

Enabling BPDU Filtering 20-14

Enabling UplinkFast for Use with Redundant Links 20-15

Enabling Cross-Stack UplinkFast 20-16

Enabling BackboneFast 20-16

Enabling EtherChannel Guard 20-17

Enabling Root Guard 20-18

Enabling Loop Guard 20-18

Displaying the Spanning-Tree Status 20-19

CHAPTER

21 Configuring Flex Links and the MAC Address-Table Move Update Feature 21-1

Understanding Flex Links and the MAC Address-Table Move Update 21-1

Flex Links 21-1

VLAN Flex Link Load Balancing and Support 21-2

MAC Address-Table Move Update 21-3

Contents

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Catalyst 3750-E and 3560-E Switch Software Configuration Guide

OL-9775-02

Configuring Flex Links and MAC Address-Table Move Update 21-5

Configuration Guidelines 21-5

Default Configuration 21-5

Configuring Flex Links and MAC Address-Table Move Update 21-6

Configuring Flex Links 21-6

Configuring VLAN Load Balancing on Flex Links 21-8

Configuring the MAC Address-Table Move Update Feature 21-9

Monitoring Flex Links and the MAC Address-Table Move Update 21-11

CHAPTER

22 Configuring DHCP Features and IP Source Guard 22-1

Understanding DHCP Features 22-1

DHCP Server 22-2

DHCP Relay Agent 22-2

DHCP Snooping 22-2

Option-82 Data Insertion 22-3

Cisco IOS DHCP Server Database 22-6

DHCP Snooping Binding Database 22-6

DHCP Snooping and Switch Stacks 22-8

Configuring DHCP Features 22-8

Default DHCP Configuration 22-8

DHCP Snooping Configuration Guidelines 22-9

Configuring the DHCP Server 22-10

DHCP Server and Switch Stacks 22-10

Configuring the DHCP Relay Agent 22-11

Specifying the Packet Forwarding Address 22-11

Enabling DHCP Snooping and Option 82 22-12

Enabling DHCP Snooping on Private VLANs 22-14

Enabling the Cisco IOS DHCP Server Database 22-14

Enabling the DHCP Snooping Binding Database Agent 22-14

Displaying DHCP Snooping Information 22-15

Understanding IP Source Guard 22-16

Source IP Address Filtering 22-16

Source IP and MAC Address Filtering 22-17

Configuring IP Source Guard 22-17

Default IP Source Guard Configuration 22-17

IP Source Guard Configuration Guidelines 22-17

Enabling IP Source Guard 22-18

Displaying IP Source Guard Information 22-19

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