Cisco Catalyst 3560V2-48PS Switch Configuration Guide

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Catalyst 3560 Switch Software

Configuration Guide

Cisco IOS Release 12.2(44)SE

January 2008

Text Part Number: OL-8553-05

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Catalyst 3560 Switch Software Configuration Guide

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CONTENTS

Preface xliii

Audience xliii

Purpose xliii

Conventions xliv

Related Publications xliv

Obtaining Documentation, Obtaining Support, and Security Guidelines xlvi

CHAPTER

1Overview 1-1

Features 1-1

Ease-of-Deployment and Ease-of-Use Features 1-2

Performance Features 1-3

Management Options 1-5

Manageability Features 1-5

Availability and Redundancy Features 1-7

VLAN Features 1-8

Security Features 1-8

QoS and CoS Features 1-10

Layer 3 Features 1-12

Power over Ethernet Features 1-13

Monitoring Features 1-13

Default Settings After Initial Switch Configuration 1-14

Network Configuration Examples 1-17

Design Concepts for Using the Switch 1-17

Small to Medium-Sized Network Using Catalyst 3560 Switches 1-20

Large Network Using Catalyst 3560 Switches 1-22

Long-Distance, High-Bandwidth Transport Configuration 1-23

Where to Go Next 1-24

CHAPTER

2Using the Command-Line Interface 2-1

Understanding Command Modes 2-1

Understanding the Help System 2-3

Understanding Abbreviated Commands 2-4

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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 2-7

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 2-10

CHAPTER

3Assigning 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

Understanding DHCP-based Autoconfiguration and Image Update 3-5

DHCP Autoconfiguration 3-5

DHCP Auto-Image Update 3-5

Limitations and Restrictions 3-5

Configuring DHCP-Based Autoconfiguration 3-6

DHCP Server Configuration Guidelines 3-6

Configuring the TFTP Server 3-7

Configuring the DNS 3-7

Configuring the Relay Device 3-8

Obtaining Configuration Files 3-8

Example Configuration 3-9

Configuring the DHCP Auto Configuration and Image Update Features 3-11

Configuring DHCP Autoconfiguration (Only Configuration File) 3-11

Configuring DHCP Auto-Image Update (Configuration File and Image) 3-12

Configuring the Client 3-13

Manually Assigning IP Information 3-14

Checking and Saving the Running Configuration 3-15

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Modifying the Startup Configuration 3-16

Default Boot Configuration 3-16

Automatically Downloading a Configuration File 3-16

Specifying the Filename to Read and Write the System Configuration 3-16

Booting Manually 3-17

Booting a Specific Software Image 3-18

Controlling Environment Variables 3-18

Scheduling a Reload of the Software Image 3-20

Configuring a Scheduled Reload 3-20

Displaying Scheduled Reload Information 3-21

CHAPTER

4Configuring 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 4-13

Displaying CNS Configuration 4-14

CHAPTER

5Clustering Switches 5-1

Understanding Switch Clusters 5-1

Cluster Command Switch Characteristics 5-3

Standby Cluster Command Switch Characteristics 5-3

Candidate Switch and Cluster Member Switch Characteristics 5-3

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Planning a Switch Cluster 5-4

Automatic Discovery of Cluster Candidates and Members 5-4

Discovery Through CDP Hops 5-5

Discovery Through Non-CDP-Capable and Noncluster-Capable Devices 5-6

Discovery Through Different VLANs 5-6

Discovery Through Different Management VLANs 5-7

Discovery Through Routed Ports 5-8

Discovery of Newly Installed Switches 5-9

HSRP and Standby Cluster Command Switches 5-10

Virtual IP Addresses 5-11

Other Considerations for Cluster Standby Groups 5-11

Automatic Recovery of Cluster Configuration 5-12

IP Addresses 5-13

Hostnames 5-13

Passwords 5-13

SNMP Community Strings 5-14

TACACS+ and RADIUS 5-14

LRE Profiles 5-14

Using the CLI to Manage Switch Clusters 5-15

Catalyst 1900 and Catalyst 2820 CLI Considerations 5-15

Using SNMP to Manage Switch Clusters 5-15

CHAPTER

6Administering the Switch 6-1

Managing the System Time and Date 6-1

Understanding the System Clock 6-1

Understanding Network Time Protocol 6-2

Configuring NTP 6-3

Default NTP Configuration 6-4

Configuring NTP Authentication 6-4

Configuring NTP Associations 6-5

Configuring NTP Broadcast Service 6-6

Configuring NTP Access Restrictions 6-8

Configuring the Source IP Address for NTP Packets 6-10

Displaying the NTP Configuration 6-11

Configuring Time and Date Manually 6-11

Setting the System Clock 6-11

Displaying the Time and Date Configuration 6-12

Configuring the Time Zone 6-12

Configuring Summer Time (Daylight Saving Time) 6-13

Contents

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Configuring a System Name and Prompt 6-14

Default System Name and Prompt Configuration 6-15

Configuring a System Name 6-15

Understanding DNS 6-15

Default DNS Configuration 6-16

Setting Up DNS 6-16

Displaying the DNS Configuration 6-17

Creating a Banner 6-17

Default Banner Configuration 6-17

Configuring a Message-of-the-Day Login Banner 6-18

Configuring a Login Banner 6-19

Managing the MAC Address Table 6-19

Building the Address Table 6-20

MAC Addresses and VLANs 6-20

Default MAC Address Table Configuration 6-21

Changing the Address Aging Time 6-21

Removing Dynamic Address Entries 6-22

Configuring MAC Address Notification Traps 6-22

Adding and Removing Static Address Entries 6-24

Configuring Unicast MAC Address Filtering 6-25

Displaying Address Table Entries 6-26

Managing the ARP Table 6-26

CHAPTER

7Configuring SDM Templates 7-1

Understanding the SDM Templates 7-1

Dual IPv4 and IPv6 SDM Templates 7-2

Configuring the Switch SDM Template 7-3

Default SDM Template 7-3

SDM Template Configuration Guidelines 7-4

Setting the SDM Template 7-4

Displaying the SDM Templates 7-5

CHAPTER

8Configuring Switch-Based Authentication 8-1

Preventing Unauthorized Access to Your Switch 8-1

Protecting Access to Privileged EXEC Commands 8-2

Default Password and Privilege Level Configuration 8-2

Setting or Changing a Static Enable Password 8-3

Protecting Enable and Enable Secret Passwords with Encryption 8-3

Disabling Password Recovery 8-5

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Setting a Telnet Password for a Terminal Line 8-6

Configuring Username and Password Pairs 8-6

Configuring Multiple Privilege Levels 8-7

Setting the Privilege Level for a Command 8-8

Changing the Default Privilege Level for Lines 8-9

Logging into and Exiting a Privilege Level 8-9

Controlling Switch Access with TACACS+ 8-10

Understanding TACACS+ 8-10

TACACS+ Operation 8-12

Configuring TACACS+ 8-12

Default TACACS+ Configuration 8-13

Identifying the TACACS+ Server Host and Setting the Authentication Key 8-13

Configuring TACACS+ Login Authentication 8-14

Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services 8-16

Starting TACACS+ Accounting 8-17

Displaying the TACACS+ Configuration 8-17

Controlling Switch Access with RADIUS 8-17

Understanding RADIUS 8-18

RADIUS Operation 8-19

Configuring RADIUS 8-19

Default RADIUS Configuration 8-20

Identifying the RADIUS Server Host 8-20

Configuring RADIUS Login Authentication 8-23

Defining AAA Server Groups 8-25

Configuring RADIUS Authorization for User Privileged Access and Network Services 8-27

Starting RADIUS Accounting 8-28

Configuring Settings for All RADIUS Servers 8-29

Configuring the Switch to Use Vendor-Specific RADIUS Attributes 8-29

Configuring the Switch for Vendor-Proprietary RADIUS Server Communication 8-31

Displaying the RADIUS Configuration 8-31

Controlling Switch Access with Kerberos 8-32

Understanding Kerberos 8-32

Kerberos Operation 8-34

Authenticating to a Boundary Switch 8-34

Obtaining a TGT from a KDC 8-35

Authenticating to Network Services 8-35

Configuring Kerberos 8-35

Configuring the Switch for Local Authentication and Authorization 8-36

Contents

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Configuring the Switch for Secure Shell 8-37

Understanding SSH 8-38

SSH Servers, Integrated Clients, and Supported Versions 8-38

Limitations 8-39

Configuring SSH 8-39

Configuration Guidelines 8-39

Setting Up the Switch to Run SSH 8-39

Configuring the SSH Server 8-41

Displaying the SSH Configuration and Status 8-42

Configuring the Switch for Secure Socket Layer HTTP 8-42

Understanding Secure HTTP Servers and Clients 8-42

Certificate Authority Trustpoints 8-43

CipherSuites 8-44

Configuring Secure HTTP Servers and Clients 8-45

Default SSL Configuration 8-45

SSL Configuration Guidelines 8-45

Configuring a CA Trustpoint 8-45

Configuring the Secure HTTP Server 8-46

Configuring the Secure HTTP Client 8-48

Displaying Secure HTTP Server and Client Status 8-48

Configuring the Switch for Secure Copy Protocol 8-49

Information About Secure Copy 8-49

CHAPTER

9Configuring IEEE 802.1x Port-Based Authentication 9-1

Understanding IEEE 802.1x Port-Based Authentication 9-1

Device Roles 9-2

Authentication Process 9-3

Authentication Initiation and Message Exchange 9-5

Ports in Authorized and Unauthorized States 9-7

IEEE 802.1x Host Mode 9-7

IEEE 802.1x Accounting 9-8

IEEE 802.1x Accounting Attribute-Value Pairs 9-8

Using 802.1x Readiness Check 9-10

Using IEEE 802.1x Authentication with VLAN Assignment 9-10

Using IEEE 802.1x Authentication with Per-User ACLs 9-11

Using IEEE 802.1x Authentication with Guest VLAN 9-12

Using IEEE 802.1x Authentication with Restricted VLAN 9-13

Using IEEE 802.1x Authentication with Inaccessible Authentication Bypass 9-14

Using IEEE 802.1x Authentication with Voice VLAN Ports 9-15

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Using IEEE 802.1x Authentication with Port Security 9-16

Using IEEE 802.1x Authentication with Wake-on-LAN 9-17

Using IEEE 802.1x Authentication with MAC Authentication Bypass 9-17

Using Network Admission Control Layer 2 IEEE 802.1x Validation 9-19

Using Multidomain Authentication 9-19

Using Web Authentication 9-20

Web Authentication with Automatic MAC Check 9-21

Configuring IEEE 802.1x Authentication 9-21

Default IEEE 802.1x Authentication Configuration 9-22

IEEE 802.1x Authentication Configuration Guidelines 9-23

IEEE 802.1x Authentication 9-23

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

Bypass 9-25

MAC Authentication Bypass 9-25

Upgrading from a Previous Software Release 9-26

Configuring 802.1x Readiness Check 9-26

Configuring IEEE 802.1x Authentication 9-27

Configuring the Switch-to-RADIUS-Server Communication 9-28

Configuring the Host Mode 9-30

Configuring Periodic Re-Authentication 9-31

Manually Re-Authenticating a Client Connected to a Port 9-31

Changing the Quiet Period 9-32

Changing the Switch-to-Client Retransmission Time 9-32

Setting the Switch-to-Client Frame-Retransmission Number 9-33

Setting the Re-Authentication Number 9-33

Configuring IEEE 802.1x Accounting 9-34

Configuring a Guest VLAN 9-35

Configuring a Restricted VLAN 9-36

Configuring the Inaccessible Authentication Bypass Feature 9-38

Configuring IEEE 802.1x Authentication with WoL 9-40

Configuring MAC Authentication Bypass 9-41

Configuring NAC Layer 2 IEEE 802.1x Validation 9-42

Configuring Web Authentication 9-43

Disabling IEEE 802.1x Authentication on the Port 9-45

Resetting the IEEE 802.1x Authentication Configuration to the Default Values 9-46

Displaying IEEE 802.1x Statistics and Status 9-46

Contents

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CHAPTER

10 Configuring Interface Characteristics 10-1

Understanding Interface Types 10-1

Port-Based VLANs 10-2

Switch Ports 10-2

Access Ports 10-3

Trunk Ports 10-3

Tunnel Ports 10-3

Routed Ports 10-4

Switch Virtual Interfaces 10-4

EtherChannel Port Groups 10-5

Dual-Purpose Uplink Ports 10-6

Power over Ethernet Ports 10-6

Supported Protocols and Standards 10-6

Powered-Device Detection and Initial Power Allocation 10-7

Power Management Modes 10-8

Connecting Interfaces 10-9

Using Interface Configuration Mode 10-10

Procedures for Configuring Interfaces 10-10

Configuring a Range of Interfaces 10-11

Configuring and Using Interface Range Macros 10-12

Configuring Ethernet Interfaces 10-14

Default Ethernet Interface Configuration 10-14

Setting the Type of a Dual-Purpose Uplink Port 10-16

Configuring Interface Speed and Duplex Mode 10-17

Speed and Duplex Configuration Guidelines 10-17

Setting the Interface Speed and Duplex Parameters 10-18

Configuring IEEE 802.3x Flow Control 10-19

Configuring Auto-MDIX on an Interface 10-20

Configuring a Power Management Mode on a PoE Port 10-21

Budgeting Power for Devices Connected to a PoE Port 10-22

Adding a Description for an Interface 10-24

Configuring Layer 3 Interfaces 10-25

Configuring the System MTU 10-26

Monitoring and Maintaining the Interfaces 10-28

Monitoring Interface Status 10-28

Clearing and Resetting Interfaces and Counters 10-29

Shutting Down and Restarting the Interface 10-29

Contents

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CHAPTER

11 Configuring Smartports Macros 11-1

Understanding Smartports Macros 11-1

Configuring Smartports Macros 11-2

Default Smartports Macro Configuration 11-2

Smartports Macro Configuration Guidelines 11-2

Creating Smartports Macros 11-4

Applying Smartports Macros 11-5

Applying Cisco-Default Smartports Macros 11-6

Displaying Smartports Macros 11-8

CHAPTER

12 Configuring VLANs 12-1

Understanding VLANs 12-1

Supported VLANs 12-2

VLAN Port Membership Modes 12-3

Configuring Normal-Range VLANs 12-4

Token Ring VLANs 12-6

Normal-Range VLAN Configuration Guidelines 12-6

VLAN Configuration Mode Options 12-7

VLAN Configuration in config-vlan Mode 12-7

VLAN Configuration in VLAN Database Configuration Mode 12-7

Saving VLAN Configuration 12-7

Default Ethernet VLAN Configuration 12-8

Creating or Modifying an Ethernet VLAN 12-9

Deleting a VLAN 12-10

Assigning Static-Access Ports to a VLAN 12-11

Configuring Extended-Range VLANs 12-12

Default VLAN Configuration 12-12

Extended-Range VLAN Configuration Guidelines 12-13

Creating an Extended-Range VLAN 12-13

Creating an Extended-Range VLAN with an Internal VLAN ID 12-15

Displaying VLANs 12-16

Configuring VLAN Trunks 12-16

Trunking Overview 12-16

Encapsulation Types 12-18

IEEE 802.1Q Configuration Considerations 12-19

Default Layer 2 Ethernet Interface VLAN Configuration 12-19

Contents

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Configuring an Ethernet Interface as a Trunk Port 12-19

Interaction with Other Features 12-20

Configuring a Trunk Port 12-20

Defining the Allowed VLANs on a Trunk 12-21

Changing the Pruning-Eligible List 12-22

Configuring the Native VLAN for Untagged Traffic 12-23

Configuring Trunk Ports for Load Sharing 12-24

Load Sharing Using STP Port Priorities 12-24

Load Sharing Using STP Path Cost 12-26

Configuring VMPS 12-27

Understanding VMPS 12-28

Dynamic-Access Port VLAN Membership 12-28

Default VMPS Client Configuration 12-29

VMPS Configuration Guidelines 12-29

Configuring the VMPS Client 12-30

Entering the IP Address of the VMPS 12-30

Configuring Dynamic-Access Ports on VMPS Clients 12-30

Reconfirming VLAN Memberships 12-31

Changing the Reconfirmation Interval 12-31

Changing the Retry Count 12-32

Monitoring the VMPS 12-32

Troubleshooting Dynamic-Access Port VLAN Membership 12-33

VMPS Configuration Example 12-33

CHAPTER

13 Configuring VTP 13-1

Understanding VTP 13-1

The VTP Domain 13-2

VTP Modes 13-3

VTP Advertisements 13-3

VTP Version 2 13-4

VTP Pruning 13-4

Configuring VTP 13-6

Default VTP Configuration 13-6

VTP Configuration Options 13-7

VTP Configuration in Global Configuration Mode 13-7

VTP Configuration in VLAN Database Configuration Mode 13-7

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VTP Configuration Guidelines 13-8

Domain Names 13-8

Passwords 13-8

VTP Version 13-8

Configuration Requirements 13-9

Configuring a VTP Server 13-9

Configuring a VTP Client 13-11

Disabling VTP (VTP Transparent Mode) 13-12

Enabling VTP Version 2 13-13

Enabling VTP Pruning 13-14

Adding a VTP Client Switch to a VTP Domain 13-14

Monitoring VTP 13-16

CHAPTER

14 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

15 Configuring Private VLANs 14-1

Understanding Private VLANs 14-1

IP Addressing Scheme with Private VLANs 14-3

Private VLANs across Multiple Switches 14-4

Private-VLAN Interaction with Other Features 14-4

Private VLANs and Unicast, Broadcast, and Multicast Traffic 14-5

Private VLANs and SVIs 14-5

Configuring Private VLANs 14-5

Tasks for Configuring Private VLANs 14-6

Default Private-VLAN Configuration 14-6

Private-VLAN Configuration Guidelines 14-6

Secondary and Primary VLAN Configuration 14-6

Private-VLAN Port Configuration 14-8

Limitations with Other Features 14-8

Contents

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Configuring and Associating VLANs in a Private VLAN 14-9

Configuring a Layer 2 Interface as a Private-VLAN Host Port 14-11

Configuring a Layer 2 Interface as a Private-VLAN Promiscuous Port 14-12

Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface 14-13

Monitoring Private VLANs 14-14

CHAPTER

16 Configuring IEEE 802.1Q and Layer 2 Protocol Tunneling 16-1

Understanding IEEE 802.1Q Tunneling 16-1

Configuring IEEE 802.1Q Tunneling 16-4

Default IEEE 802.1Q Tunneling Configuration 16-4

IEEE 802.1Q Tunneling Configuration Guidelines 16-4

Native VLANs 16-4

System MTU 16-5

IEEE 802.1Q Tunneling and Other Features 16-6

Configuring an IEEE 802.1Q Tunneling Port 16-6

Understanding Layer 2 Protocol Tunneling 16-7

Configuring Layer 2 Protocol Tunneling 16-10

Default Layer 2 Protocol Tunneling Configuration 16-11

Layer 2 Protocol Tunneling Configuration Guidelines 16-12

Configuring Layer 2 Protocol Tunneling 16-13

Configuring Layer 2 Tunneling for EtherChannels 16-14

Configuring the SP Edge Switch 16-14

Configuring the Customer Switch 16-16

Monitoring and Maintaining Tunneling Status 16-18

CHAPTER

17 Configuring STP 17-1

Understanding Spanning-Tree Features 17-1

STP Overview 17-2

Spanning-Tree Topology and BPDUs 17-3

Bridge ID, Switch Priority, and Extended System ID 17-4

Spanning-Tree Interface States 17-4

Blocking State 17-6

Listening State 17-6

Learning State 17-6

Forwarding State 17-6

Disabled State 17-7

How a Switch or Port Becomes the Root Switch or Root Port 17-7

Spanning Tree and Redundant Connectivity 17-8

Spanning-Tree Address Management 17-8

Contents

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Accelerated Aging to Retain Connectivity 17-8

Spanning-Tree Modes and Protocols 17-9

Supported Spanning-Tree Instances 17-9

Spanning-Tree Interoperability and Backward Compatibility 17-10

STP and IEEE 802.1Q Trunks 17-10

VLAN-Bridge Spanning Tree 17-10

Configuring Spanning-Tree Features 17-11

Default Spanning-Tree Configuration 17-11

Spanning-Tree Configuration Guidelines 17-12

Changing the Spanning-Tree Mode. 17-13

Disabling Spanning Tree 17-14

Configuring the Root Switch 17-14

Configuring a Secondary Root Switch 17-16

Configuring Port Priority 17-17

Configuring Path Cost 17-18

Configuring the Switch Priority of a VLAN 17-19

Configuring Spanning-Tree Timers 17-20

Configuring the Hello Time 17-20

Configuring the Forwarding-Delay Time for a VLAN 17-21

Configuring the Maximum-Aging Time for a VLAN 17-21

Configuring the Transmit Hold-Count 17-22

Displaying the Spanning-Tree Status 17-22

CHAPTER

18 Configuring MSTP 18-1

Understanding MSTP 18-2

Multiple Spanning-Tree Regions 18-2

IST, CIST, and CST 18-3

Operations Within an MST Region 18-3

Operations Between MST Regions 18-4

IEEE 802.1s Terminology 18-5

Hop Count 18-5

Boundary Ports 18-6

IEEE 802.1s Implementation 18-6

Port Role Naming Change 18-7

Interoperation Between Legacy and Standard Switches 18-7

Detecting Unidirectional Link Failure 18-8

Interoperability with IEEE 802.1D STP 18-8

Contents

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Understanding RSTP 18-8

Port Roles and the Active Topology 18-9

Rapid Convergence 18-10

Synchronization of Port Roles 18-11

Bridge Protocol Data Unit Format and Processing 18-12

Processing Superior BPDU Information 18-13

Processing Inferior BPDU Information 18-13

Topology Changes 18-13

Configuring MSTP Features 18-14

Default MSTP Configuration 18-14

MSTP Configuration Guidelines 18-15

Specifying the MST Region Configuration and Enabling MSTP 18-16

Configuring the Root Switch 18-17

Configuring a Secondary Root Switch 18-18

Configuring Port Priority 18-19

Configuring Path Cost 18-20

Configuring the Switch Priority 18-21

Configuring the Hello Time 18-22

Configuring the Forwarding-Delay Time 18-23

Configuring the Maximum-Aging Time 18-23

Configuring the Maximum-Hop Count 18-24

Specifying the Link Type to Ensure Rapid Transitions 18-24

Designating the Neighbor Type 18-25

Restarting the Protocol Migration Process 18-25

Displaying the MST Configuration and Status 18-26

CHAPTER

19 Configuring Optional Spanning-Tree Features 19-1

Understanding Optional Spanning-Tree Features 19-1

Understanding Port Fast 19-2

Understanding BPDU Guard 19-2

Understanding BPDU Filtering 19-3

Understanding UplinkFast 19-3

Understanding BackboneFast 19-5

Understanding EtherChannel Guard 19-7

Understanding Root Guard 19-8

Understanding Loop Guard 19-9

Contents

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Configuring Optional Spanning-Tree Features 19-9

Default Optional Spanning-Tree Configuration 19-9

Optional Spanning-Tree Configuration Guidelines 19-10

Enabling Port Fast 19-10

Enabling BPDU Guard 19-11

Enabling BPDU Filtering 19-12

Enabling UplinkFast for Use with Redundant Links 19-13

Enabling BackboneFast 19-13

Enabling EtherChannel Guard 19-14

Enabling Root Guard 19-15

Enabling Loop Guard 19-15

Displaying the Spanning-Tree Status 19-16

CHAPTER

20 Configuring Flex Links and the MAC Address-Table Move Update Feature 20-1

Understanding Flex Links and the MAC Address-Table Move Update 20-1

Flex Links 20-1

VLAN Flex Link Load Balancing and Support 20-2

Flex Link Multicast Fast Convergence 20-3

Learning the Other Flex Link Port as the mrouter Port 20-3

Generating IGMP Reports 20-3

Leaking IGMP Reports 20-4

MAC Address-Table Move Update 20-6

Configuring Flex Links and the MAC Address-Table Move Update 20-7

Default Configuration 20-7

Configuration Guidelines 20-8

Configuring Flex Links 20-8

Configuring VLAN Load Balancing on Flex Links 20-10

Configuring the MAC Address-Table Move Update Feature 20-12

Monitoring Flex Links and the MAC Address-Table Move Update 20-14

CHAPTER

21 Configuring DHCP Features and IP Source Guard 21-1

Understanding DHCP Features 21-1

DHCP Server 21-2

DHCP Relay Agent 21-2

DHCP Snooping 21-2

Option-82 Data Insertion 21-3

Cisco IOS DHCP Server Database 21-6

DHCP Snooping Binding Database 21-7

Contents

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Catalyst 3560 Switch Software Configuration Guide

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Configuring DHCP Features 21-8

Default DHCP Configuration 21-8

DHCP Snooping Configuration Guidelines 21-9

Configuring the DHCP Server 21-10

Configuring the DHCP Relay Agent 21-10

Specifying the Packet Forwarding Address 21-11

Enabling DHCP Snooping and Option 82 21-12

Enabling DHCP Snooping on Private VLANs 21-13

Enabling the Cisco IOS DHCP Server Database 21-14

Enabling the DHCP Snooping Binding Database Agent 21-14

Displaying DHCP Snooping Information 21-15

Understanding IP Source Guard 21-15

Source IP Address Filtering 21-16

Source IP and MAC Address Filtering 21-16

Configuring IP Source Guard 21-16

Default IP Source Guard Configuration 21-16

IP Source Guard Configuration Guidelines 21-17

Enabling IP Source Guard 21-17

Displaying IP Source Guard Information 21-19

CHAPTER

22 Configuring Dynamic ARP Inspection 22-1

Understanding Dynamic ARP Inspection 22-1

Interface Trust States and Network Security 22-3

Rate Limiting of ARP Packets 22-4

Relative Priority of ARP ACLs and DHCP Snooping Entries 22-4

Logging of Dropped Packets 22-4

Configuring Dynamic ARP Inspection 22-5

Default Dynamic ARP Inspection Configuration 22-5

Dynamic ARP Inspection Configuration Guidelines 22-6

Configuring Dynamic ARP Inspection in DHCP Environments 22-7

Configuring ARP ACLs for Non-DHCP Environments 22-8

Limiting the Rate of Incoming ARP Packets 22-11

Performing Validation Checks 22-12

Configuring the Log Buffer 22-13

Displaying Dynamic ARP Inspection Information 22-15

Contents

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CHAPTER

23 Configuring IGMP Snooping and MVR 23-1

Understanding IGMP Snooping 23-2

IGMP Versions 23-3

Joining a Multicast Group 23-3

Leaving a Multicast Group 23-5

Immediate Leave 23-5

IGMP Configurable-Leave Timer 23-6

IGMP Report Suppression 23-6

Configuring IGMP Snooping 23-7

Default IGMP Snooping Configuration 23-7

Enabling or Disabling IGMP Snooping 23-7

Setting the Snooping Method 23-8

Configuring a Multicast Router Port 23-9

Configuring a Host Statically to Join a Group 23-10

Enabling IGMP Immediate Leave 23-11

Configuring the IGMP Leave Timer 23-11

Configuring TCN-Related Commands 23-12

Controlling the Multicast Flooding Time After a TCN Event 23-12

Recovering from Flood Mode 23-13

Disabling Multicast Flooding During a TCN Event 23-13

Configuring the IGMP Snooping Querier 23-14

Disabling IGMP Report Suppression 23-15

Displaying IGMP Snooping Information 23-16

Understanding Multicast VLAN Registration 23-17

Using MVR in a Multicast Television Application 23-18

Configuring MVR 23-20

Default MVR Configuration 23-20

MVR Configuration Guidelines and Limitations 23-20

Configuring MVR Global Parameters 23-21

Configuring MVR Interfaces 23-22

Displaying MVR Information 23-24

Configuring IGMP Filtering and Throttling 23-24

Default IGMP Filtering and Throttling Configuration 23-25

Configuring IGMP Profiles 23-25

Applying IGMP Profiles 23-26

Setting the Maximum Number of IGMP Groups 23-27

Configuring the IGMP Throttling Action 23-28

Displaying IGMP Filtering and Throttling Configuration 23-29

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Cisco Catalyst 3560V2-48PS Switch Configuration Guide

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