Cisco Catalyst 3750-E Series User manual

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Catalyst 3750-E and 3560-E Switch
Software Configuration Guide
Cisco IOS Release 12.2(55)SE
August 2010
Text Part Number: OL-9775-08

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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
© 2010 Cisco Systems, Inc. All rights reserved.

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CONTENTS
Preface xlix
Audience xlix
Purpose xlix
Conventions xlix
Related Publications l
Obtaining Documentation and Submitting a Service Request li
CHAPTER 1Overview 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 1-8
VLAN Features 1-9
Security Features 1-9
QoS and CoS Features 1-12
Layer 3 Features 1-14
Power over Ethernet Features 1-15
Monitoring Features 1-15
Default Settings After Initial Switch Configuration 1-16
Network Configuration Examples 1-19
Design Concepts for Using the Switch 1-19
Small to Medium-Sized Network Using Catalyst 3750-E and 3560-E Switches 1-26
Large Network Using Catalyst 3750-E and 3560-E Switches 1-28
Multidwelling Network Using Catalyst 3750-E Switches 1-31
Long-Distance, High-Bandwidth Transport Configuration 1-32
Where to Go Next 1-33
CHAPTER 2Using the Command-Line Interface 2-1
Understanding Command Modes 2-1
Understanding the Help System 2-3
Understanding Abbreviated Commands 2-3

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Understanding no and default Forms of Commands 2-4
Understanding CLI Error Messages 2-4
Using Configuration Logging 2-4
Using Command History 2-5
Changing the Command History Buffer Size 2-5
Recalling Commands 2-6
Disabling the Command History Feature 2-6
Using Editing Features 2-6
Enabling and Disabling Editing Features 2-6
Editing Commands through Keystrokes 2-7
Editing Command Lines that Wrap 2-8
Searching and Filtering Output of show and more Commands 2-9
Accessing the CLI 2-9
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 3-6
Configuring DHCP-Based Autoconfiguration 3-6
DHCP Server Configuration Guidelines 3-7
Configuring the TFTP Server 3-7
Configuring the DNS 3-8
Configuring the Relay Device 3-8
Obtaining Configuration Files 3-9
Example Configuration 3-10
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 3-14
Manually Assigning IP Information 3-15
Checking and Saving the Running Configuration 3-16
Configuring the NVRAM Buffer Size 3-17

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Modifying the Startup Configuration 3-18
Default Boot Configuration 3-18
Automatically Downloading a Configuration File 3-18
Specifying the Filename to Read and Write the System Configuration 3-19
Booting Manually 3-19
Booting a Specific Software Image 3-20
Controlling Environment Variables 3-21
Scheduling a Reload of the Software Image 3-24
Configuring a Scheduled Reload 3-24
Displaying Scheduled Reload Information 3-25
CHAPTER 4Configuring Cisco IOS Configuration Engine 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 5Managing 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 5-7
Stack Member Numbers 5-7

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Stack Member Priority Values 5-8
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 5-11
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 5-18
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 5-23
Provisioning a New Member for a Switch Stack 5-23
Accessing the CLI of a Specific Stack Member 5-25
Displaying Switch Stack Information 5-25
Troubleshooting Stacks 5-25
Manually Disabling a Stack Port 5-26
Re-Enabling a Stack Port While Another Member Starts 5-26
Understanding the show switch stack-ports summary Output 5-27
Identifying Loopback Problems 5-28
Software Loopback 5-28
Software Loopback Example: No Connected Stack Cable 5-29
Software Loopback Examples: Connected Stack Cables 5-29
Hardware Loopback 5-30

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Hardware Loopback Example: LINK OK event 5-30
Hardware Loop Example: LINK NOT OK Event 5-31
Finding a Disconnected Stack Cable 5-32
Fixing a Bad Connection Between Stack Ports 5-33
CHAPTER 6Clustering Switches 6-1
Understanding Switch Clusters 6-2
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 6-7
Discovery Through Routed Ports 6-8
Discovery of Newly Installed Switches 6-9
HSRP and Standby Cluster Command Switches 6-10
Virtual IP Addresses 6-11
Other Considerations for Cluster Standby Groups 6-11
Automatic Recovery of Cluster Configuration 6-12
IP Addresses 6-13
Hostnames 6-13
Passwords 6-14
SNMP Community Strings 6-14
Switch Clusters and Switch Stacks 6-14
TACACS+ and RADIUS 6-16
LRE Profiles 6-16
Using the CLI to Manage Switch Clusters 6-16
Catalyst 1900 and Catalyst 2820 CLI Considerations 6-17
Using SNMP to Manage Switch Clusters 6-17
CHAPTER 7Administering the Switch 7-1
Managing the System Time and Date 7-1
Understanding the System Clock 7-2
Understanding Network Time Protocol 7-2
Configuring NTP 7-4
Default NTP Configuration 7-4

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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
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 Change Notification Traps 7-22
Configuring MAC Address Move Notification Traps 7-24
Configuring MAC Threshold Notification Traps 7-25
Adding and Removing Static Address Entries 7-27
Configuring Unicast MAC Address Filtering 7-28
Disabling MAC Address Learning on a VLAN 7-29
Displaying Address Table Entries 7-30
Managing the ARP Table 7-31

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CHAPTER 8Configuring 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 9Configuring 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
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
RADIUS Change of Authorization 9-19
Change-of-Authorization Requests 9-20
CoA Request Response Code 9-21

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CoA Request Commands 9-23
Stacking Guidelines for Session Termination 9-25
Configuring RADIUS 9-26
Default RADIUS Configuration 9-27
Identifying the RADIUS Server Host 9-27
Configuring RADIUS Login Authentication 9-29
Defining AAA Server Groups 9-31
Configuring RADIUS Authorization for User Privileged Access and Network Services 9-33
Starting RADIUS Accounting 9-34
Establishing a Session with a Router if the AAA Server is Unreachable 9-34
Configuring Settings for All RADIUS Servers 9-35
Configuring the Switch to Use Vendor-Specific RADIUS Attributes 9-35
Configuring the Switch for Vendor-Proprietary RADIUS Server Communication 9-37
Configuring CoA on the Switch 9-38
Monitoring and Troubleshooting CoA Functionality 9-39
Configuring RADIUS Server Load Balancing 9-39
Displaying the RADIUS Configuration 9-39
Controlling Switch Access with Kerberos 9-39
Understanding Kerberos 9-40
Kerberos Operation 9-42
Authenticating to a Boundary Switch 9-42
Obtaining a TGT from a KDC 9-42
Authenticating to Network Services 9-42
Configuring Kerberos 9-43
Configuring the Switch for Local Authentication and Authorization 9-43
Configuring the Switch for Secure Shell 9-45
Understanding SSH 9-45
SSH Servers, Integrated Clients, and Supported Versions 9-45
Limitations 9-46
Configuring SSH 9-46
Configuration Guidelines 9-46
Setting Up the Switch to Run SSH 9-46
Configuring the SSH Server 9-47
Displaying the SSH Configuration and Status 9-48
Configuring the Switch for Secure Socket Layer HTTP 9-49
Understanding Secure HTTP Servers and Clients 9-49
Certificate Authority Trustpoints 9-49
CipherSuites 9-51
Configuring Secure HTTP Servers and Clients 9-51

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Default SSL Configuration 9-51
SSL Configuration Guidelines 9-52
Configuring a CA Trustpoint 9-52
Configuring the Secure HTTP Server 9-53
Configuring the Secure HTTP Client 9-54
Displaying Secure HTTP Server and Client Status 9-55
Configuring the Switch for Secure Copy Protocol 9-55
Information About Secure Copy 9-56
CHAPTER 10 Configuring IEEE 802.1x Port-Based Authentication 10-1
Understanding IEEE 802.1x Port-Based Authentication 10-1
Device Roles 10-3
Authentication Process 10-4
Authentication Initiation and Message Exchange 10-6
Authentication Manager 10-8
Port-Based Authentication Methods 10-8
Per-User ACLs and Filter-Ids 10-9
Authentication Manager CLI Commands 10-9
Ports in Authorized and Unauthorized States 10-11
802.1x Authentication and Switch Stacks 10-11
802.1x Host Mode 10-12
802.1x Multiple Authentication Mode 10-13
MAC Move 10-13
MAC Replace 10-14
802.1x Accounting 10-15
802.1x Accounting Attribute-Value Pairs 10-15
802.1x Readiness Check 10-16
802.1x Authentication with VLAN Assignment 10-16
802.1x Authentication with Per-User ACLs 10-18
802.1x Authentication with Downloadable ACLs and Redirect URLs 10-19
Cisco Secure ACS and Attribute-Value Pairs for the Redirect URL 10-20
Cisco Secure ACS and Attribute-Value Pairs for Downloadable ACLs 10-20
VLAN ID-based MAC Authentication 10-21
802.1x Authentication with Guest VLAN 10-21
802.1x Authentication with Restricted VLAN 10-22
802.1x Authentication with Inaccessible Authentication Bypass 10-23
Support on Multiple-Authentication Ports 10-23
Authentication Results 10-23
Feature Interactions 10-24

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802.1x User Distribution 10-25
802.1x User Distribution Configuration Guidelines 10-25
IEEE 802.1x Authentication with Voice VLAN Ports 10-25
IEEE 802.1x Authentication with Port Security 10-26
IEEE 802.1x Authentication with Wake-on-LAN 10-27
IEEE 802.1x Authentication with MAC Authentication Bypass 10-28
Network Admission Control Layer 2 IEEE 802.1x Validation 10-29
Flexible Authentication Ordering 10-29
Open1x Authentication 10-29
Multidomain Authentication 10-30
802.1x Supplicant and Authenticator Switches with Network Edge Access Topology (NEAT) 10-31
Guidelines 10-32
Voice Aware 802.1x Security 10-32
Common Session ID 10-33
Configuring 802.1x Authentication 10-33
Default 802.1x Authentication Configuration 10-34
802.1x Authentication Configuration Guidelines 10-35
802.1x Authentication 10-35
VLAN Assignment, Guest VLAN, Restricted VLAN, and Inaccessible Authentication
Bypass 10-37
MAC Authentication Bypass 10-37
Maximum Number of Allowed Devices Per Port 10-38
Configuring 802.1x Readiness Check 10-38
Configuring Voice Aware 802.1x Security 10-39
Configuring 802.1x Violation Modes 10-40
Configuring 802.1x Authentication 10-41
Configuring the Switch-to-RADIUS-Server Communication 10-42
Configuring the Host Mode 10-44
Configuring Periodic Re-Authentication 10-45
Manually Re-Authenticating a Client Connected to a Port 10-46
Changing the Quiet Period 10-46
Changing the Switch-to-Client Retransmission Time 10-47
Setting the Switch-to-Client Frame-Retransmission Number 10-47
Setting the Re-Authentication Number 10-48
Enabling MAC Move 10-49
Enabling MAC Replace 10-49
Configuring 802.1x Accounting 10-50
Configuring a Guest VLAN 10-51
Configuring a Restricted VLAN 10-52
Configuring the Inaccessible Authentication Bypass Feature 10-54

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Configuring 802.1x Authentication with WoL 10-57
Configuring MAC Authentication Bypass 10-57
Configuring 802.1x User Distribution 10-58
Configuring NAC Layer 2 IEEE 802.1x Validation 10-59
Configuring an Authenticator and a Supplicant Switch with NEAT 10-60
Configuring NEAT with Auto Smartports Macros 10-62
Configuring 802.1x Authentication with Downloadable ACLs and Redirect URLs 10-62
Configuring Downloadable ACLs 10-62
Configuring a Downloadable Policy 10-63
Configuring VLAN ID-based MAC Authentication 10-64
Configuring Flexible Authentication Ordering 10-65
Configuring Open1x 10-65
Configuring a Web Authentication Local Banner 10-66
Disabling 802.1x Authentication on the Port 10-67
Resetting the 802.1x Authentication Configuration to the Default Values 10-67
Displaying 802.1x Statistics and Status 10-68
CHAPTER 11 Configuring Web-Based Authentication 11-1
Understanding Web-Based Authentication 11-1
Device Roles 11-2
Host Detection 11-2
Session Creation 11-3
Authentication Process 11-3
Local Web Authentication Banner 11-4
Web Authentication Customizable Web Pages 11-6
Guidelines 11-6
Web-based Authentication Interactions with Other Features 11-7
Port Security 11-7
LAN Port IP 11-8
Gateway IP 11-8
ACLs 11-8
Context-Based Access Control 11-8
802.1x Authentication 11-8
EtherChannel 11-8
Configuring Web-Based Authentication 11-9
Default Web-Based Authentication Configuration 11-9
Web-Based Authentication Configuration Guidelines and Restrictions 11-9
Web-Based Authentication Configuration Task List 11-10
Configuring the Authentication Rule and Interfaces 11-10

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Configuring AAA Authentication 11-11
Configuring Switch-to-RADIUS-Server Communication 11-11
Configuring the HTTP Server 11-13
Customizing the Authentication Proxy Web Pages 11-13
Specifying a Redirection URL for Successful Login 11-15
Configuring an AAA Fail Policy 11-15
Configuring the Web-Based Authentication Parameters 11-16
Configuring a Web Authentication Local Banner 11-16
Removing Web-Based Authentication Cache Entries 11-17
Displaying Web-Based Authentication Status 11-17
CHAPTER 12 Configuring Interface Characteristics 12-1
Interface Types 12-1
Port-Based VLANs 12-2
Switch Ports 12-2
Access Ports 12-3
Trunk Ports 12-3
Tunnel Ports 12-4
Routed Ports 12-4
Switch Virtual Interfaces 12-5
SVI Autostate Exclude 12-5
EtherChannel Port Groups 12-6
10-Gigabit Ethernet Interfaces 12-6
Power over Ethernet Ports 12-6
Supported Protocols and Standards 12-7
Powered-Device Detection and Initial Power Allocation 12-7
Power Management Modes 12-9
Power Monitoring and Power Policing 12-10
Connecting Interfaces 12-11
Using Interface Configuration Mode 12-12
Procedures for Configuring Interfaces 12-13
Configuring a Range of Interfaces 12-14
Configuring and Using Interface Range Macros 12-16
Using the Ethernet Management Port 12-18
Understanding the Ethernet Management Port 12-18
Supported Features on the Ethernet Management Port 12-20
Configuring the Ethernet Management Port 12-20
TFTP and the Ethernet Management Port 12-21
Configuring Ethernet Interfaces 12-21

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Default Ethernet Interface Configuration 12-22
Configuring Interface Speed and Duplex Mode 12-23
Speed and Duplex Configuration Guidelines 12-23
Setting the Interface Speed and Duplex Parameters 12-24
Configuring IEEE 802.3x Flow Control 12-25
Configuring Auto-MDIX on an Interface 12-26
Configuring a Power Management Mode on a PoE Port 12-27
Budgeting Power for Devices Connected to a PoE Port 12-28
Configuring Power Policing 12-30
Adding a Description for an Interface 12-31
Configuring Layer 3 Interfaces 12-32
Configuring SVI Autostate Exclude 12-33
Configuring the System MTU 12-34
Configuring the Cisco RPS 2300 12-37
Configuring the Power Supplies 12-38
Monitoring and Maintaining the Interfaces 12-39
Monitoring Interface Status 12-40
Clearing and Resetting Interfaces and Counters 12-41
Shutting Down and Restarting the Interface 12-42
CHAPTER 13 Configuring VLANs 13-1
Understanding VLANs 13-1
Supported VLANs 13-2
VLAN Port Membership Modes 13-3
Configuring Normal-Range VLANs 13-4
Token Ring VLANs 13-5
Normal-Range VLAN Configuration Guidelines 13-5
Configuring Normal-Range VLANs 13-6
Saving VLAN Configuration 13-6
Default Ethernet VLAN Configuration 13-7
Creating or Modifying an Ethernet VLAN 13-8
Deleting a VLAN 13-9
Assigning Static-Access Ports to a VLAN 13-9
Configuring Extended-Range VLANs 13-10
Default VLAN Configuration 13-10
Extended-Range VLAN Configuration Guidelines 13-11
Creating an Extended-Range VLAN 13-11
Creating an Extended-Range VLAN with an Internal VLAN ID 13-13
Displaying VLANs 13-14

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Configuring VLAN Trunks 13-14
Trunking Overview 13-14
Encapsulation Types 13-16
IEEE 802.1Q Configuration Considerations 13-17
Default Layer 2 Ethernet Interface VLAN Configuration 13-17
Configuring an Ethernet Interface as a Trunk Port 13-17
Interaction with Other Features 13-18
Configuring a Trunk Port 13-18
Defining the Allowed VLANs on a Trunk 13-19
Changing the Pruning-Eligible List 13-20
Configuring the Native VLAN for Untagged Traffic 13-21
Configuring Trunk Ports for Load Sharing 13-22
Load Sharing Using STP Port Priorities 13-22
Load Sharing Using STP Path Cost 13-24
Configuring VMPS 13-25
Understanding VMPS 13-26
Dynamic-Access Port VLAN Membership 13-26
Default VMPS Client Configuration 13-27
VMPS Configuration Guidelines 13-27
Configuring the VMPS Client 13-28
Entering the IP Address of the VMPS 13-28
Configuring Dynamic-Access Ports on VMPS Clients 13-28
Reconfirming VLAN Memberships 13-29
Changing the Reconfirmation Interval 13-29
Changing the Retry Count 13-30
Monitoring the VMPS 13-30
Troubleshooting Dynamic-Access Port VLAN Membership 13-31
VMPS Configuration Example 13-31
CHAPTER 14 Configuring VTP 14-1
Understanding VTP 14-1
The VTP Domain 14-2
VTP Modes 14-3
VTP Advertisements 14-4
VTP Version 2 14-4
VTP Version 3 14-5
VTP Pruning 14-6
VTP and Switch Stacks 14-7
Configuring VTP 14-8

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Default VTP Configuration 14-8
VTP Configuration Guidelines 14-9
Domain Names 14-9
Passwords 14-9
VTP Version 14-10
Configuration Requirements 14-11
Configuring VTP Mode 14-11
Configuring a VTP Version 3 Password 14-13
Configuring a VTP Version 3 Primary Server 14-14
Enabling the VTP Version 14-14
Enabling VTP Pruning 14-15
Configuring VTP on a Per-Port Basis 14-16
Adding a VTP Client Switch to a VTP Domain 14-16
Monitoring VTP 14-17
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 16-5
Configuring Private VLANs 16-6
Tasks for Configuring Private VLANs 16-6
Default Private-VLAN Configuration 16-6
Private-VLAN Configuration Guidelines 16-7

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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 16-9
Configuring a Layer 2 Interface as a Private-VLAN Host Port 16-11
Configuring a Layer 2 Interface as a Private-VLAN Promiscuous Port 16-12
Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface 16-13
Monitoring Private VLANs 16-14
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
Bridge ID, Switch Priority, and Extended System ID 18-4
Spanning-Tree Interface States 18-5
Blocking State 18-6
Listening State 18-7
Learning State 18-7
Forwarding State 18-7
Disabled State 18-7

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How a Switch or Port Becomes the Root Switch or Root Port 18-8
Spanning Tree and Redundant Connectivity 18-8
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
CHAPTER 19 Configuring MSTP 19-1
Understanding MSTP 19-2
Multiple Spanning-Tree Regions 19-2
IST, CIST, and CST 19-2
Operations Within an MST Region 19-3
Operations Between MST Regions 19-3
IEEE 802.1s Terminology 19-5
Hop Count 19-5
Boundary Ports 19-6
IEEE 802.1s Implementation 19-6
Port Role Naming Change 19-6
Interoperation Between Legacy and Standard Switches 19-7

Contents
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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
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Detecting Unidirectional Link Failure 19-7
MSTP and Switch Stacks 19-8
Interoperability with IEEE 802.1D STP 19-8
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 19-14
MSTP Configuration Guidelines 19-15
Specifying the MST Region Configuration and Enabling MSTP 19-16
Configuring the Root Switch 19-18
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 19-23
Configuring the Forwarding-Delay Time 19-24
Configuring the Maximum-Aging Time 19-24
Configuring the Maximum-Hop Count 19-25
Specifying the Link Type to Ensure Rapid Transitions 19-25
Designating the Neighbor Type 19-26
Restarting the Protocol Migration Process 19-26
Displaying the MST Configuration and Status 19-27
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