Cisco WS-CBS3032-DEL User manual

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Cisco Catalyst Blade Switch 3130 and
3032 for Dell Software Configuration
Guide
Cisco IOS Release 12.2(58)SE
April 2011
Text Part Number: OL-13270-06

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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
© 2008–20010 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 1-3
Performance Features 1-4
Management Options 1-5
Manageability Features 1-6
Availability and Redundancy Features 1-8
VLAN Features 1-9
Security Features 1-10
QoS and CoS Features 1-13
Layer 3 Features 1-14
Monitoring Features 1-15
Default Settings After Initial Switch Configuration 1-16
Network Configuration Examples 1-20
Design Concepts for Using the Switch 1-20
Small to Medium-Sized Network 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 2-3
Understanding no and default Forms of Commands 2-4
Understanding CLI Error Messages 2-4
Using Configuration Logging 2-5
Using Command History 2-5

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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 3-2
Assigning Switch Information 3-3
Default Switch Information 3-3
Understanding DHCP-Based Autoconfiguration 3-4
DHCP Client Request Process 3-4
Understanding DHCP-based Autoconfiguration and Image Update 3-5
DHCP Autoconfiguration 3-5
DHCP Auto-Image Update 3-6
Limitations and Restrictions 3-6
Configuring DHCP-Based Autoconfiguration 3-7
DHCP Server Configuration Guidelines 3-7
Configuring the TFTP Server 3-8
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 3-12
Configuring DHCP Autoconfiguration (Only Configuration File) 3-12
Configuring DHCP Auto-Image Update (Configuration File and Image) 3-13
Configuring the Client 3-14
Manually Assigning IP Information 3-15
Checking and Saving the Running Configuration 3-17
Configuring the NVRAM Buffer Size 3-18
Modifying the Startup Configuration 3-19
Default Boot Configuration 3-19
Automatically Downloading a Configuration File 3-19
Specifying the Filename to Read and Write the System Configuration 3-20

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Booting Manually 3-20
Booting a Specific Software Image 3-21
Controlling Environment Variables 3-22
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 4-7
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 5Administering the Switch 5-1
Managing the System Time and Date 5-1
Understanding the System Clock 5-2
Understanding Network Time Protocol 5-2
NTP Version 4 5-4
Configuring Time and Date Manually 5-4
Setting the System Clock 5-5
Displaying the Time and Date Configuration 5-5
Configuring the Time Zone 5-6
Configuring Summer Time (Daylight Saving Time) 5-7

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Configuring a System Name and Prompt 5-8
Default System Name and Prompt Configuration 5-9
Configuring a System Name 5-9
Understanding DNS 5-9
Default DNS Configuration 5-10
Setting Up DNS 5-10
Displaying the DNS Configuration 5-11
Creating a Banner 5-11
Default Banner Configuration 5-11
Configuring a Message-of-the-Day Login Banner 5-12
Configuring a Login Banner 5-13
Managing the MAC Address Table 5-13
Building the Address Table 5-14
MAC Addresses and VLANs 5-14
MAC Addresses and Switch Stacks 5-15
Default MAC Address Table Configuration 5-15
Changing the Address Aging Time 5-16
Removing Dynamic Address Entries 5-16
Configuring MAC Address Change Notification Traps 5-16
Configuring MAC Address Move Notification Traps 5-18
Configuring MAC Threshold Notification Traps 5-19
Adding and Removing Static Address Entries 5-20
Configuring Unicast MAC Address Filtering 5-21
Disabling MAC Address Learning on a VLAN 5-23
Displaying Address Table Entries 5-24
Managing the ARP Table 5-24
CHAPTER 6Configuring Switch-Based Authentication 6-1
Preventing Unauthorized Access to Your Switch 6-1
Protecting Access to Privileged EXEC Commands 6-2
Default Password and Privilege Level Configuration 6-2
Setting or Changing a Static Enable Password 6-3
Protecting Enable and Enable Secret Passwords with Encryption 6-3
Disabling Password Recovery 6-5
Setting a Telnet Password for a Terminal Line 6-6
Configuring Username and Password Pairs 6-6
Configuring Multiple Privilege Levels 6-7
Setting the Privilege Level for a Command 6-8
Changing the Default Privilege Level for Lines 6-9

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Logging into and Exiting a Privilege Level 6-9
Controlling Switch Access with TACACS+ 6-10
Understanding TACACS+ 6-10
TACACS+ Operation 6-12
Configuring TACACS+ 6-12
Default TACACS+ Configuration 6-13
Identifying the TACACS+ Server Host and Setting the Authentication Key 6-13
Configuring TACACS+ Login Authentication 6-14
Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services 6-16
Starting TACACS+ Accounting 6-17
Establishing a Session with a Router if the AAA Server is Unreachable 6-17
Displaying the TACACS+ Configuration 6-17
Controlling Switch Access with RADIUS 6-18
Understanding RADIUS 6-18
RADIUS Operation 6-19
RADIUS Change of Authorization 6-20
Overview 6-20
Change-of-Authorization Requests 6-21
CoA Request Response Code 6-22
CoA Request Commands 6-23
Stacking Guidelines for Session Termination 6-26
Configuring RADIUS 6-27
Default RADIUS Configuration 6-27
Identifying the RADIUS Server Host 6-27
Configuring RADIUS Login Authentication 6-30
Defining AAA Server Groups 6-32
Configuring RADIUS Authorization for User Privileged Access and Network Services 6-34
Starting RADIUS Accounting 6-35
Establishing a Session with a Router if the AAA Server is Unreachable 6-35
Configuring Settings for All RADIUS Servers 6-36
Configuring the Switch to Use Vendor-Specific RADIUS Attributes 6-36
Configuring the Switch for Vendor-Proprietary RADIUS Server Communication 6-38
Configuring CoA on the Switch 6-39
Monitoring and Troubleshooting CoA Functionality 6-40
Configuring RADIUS Server Load Balancing 6-40
Displaying the RADIUS Configuration 6-40
Controlling Switch Access with Kerberos 6-40
Understanding Kerberos 6-41
Kerberos Operation 6-43

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Authenticating to a Boundary Switch 6-43
Obtaining a TGT from a KDC 6-43
Authenticating to Network Services 6-44
Configuring Kerberos 6-44
Configuring the Switch for Local Authentication and Authorization 6-44
Configuring the Switch for Secure Shell 6-45
Understanding SSH 6-46
SSH Servers, Integrated Clients, and Supported Versions 6-46
Limitations 6-47
Configuring SSH 6-47
Configuration Guidelines 6-47
Setting Up the Switch to Run SSH 6-47
Configuring the SSH Server 6-48
Displaying the SSH Configuration and Status 6-49
Configuring the Switch for Secure Socket Layer HTTP 6-50
Understanding Secure HTTP Servers and Clients 6-50
Certificate Authority Trustpoints 6-50
CipherSuites 6-51
Configuring Secure HTTP Servers and Clients 6-52
Default SSL Configuration 6-52
SSL Configuration Guidelines 6-52
Configuring a CA Trustpoint 6-53
Configuring the Secure HTTP Server 6-54
Configuring the Secure HTTP Client 6-55
Displaying Secure HTTP Server and Client Status 6-56
Configuring the Switch for Secure Copy Protocol 6-57
Information About Secure Copy 6-57
CHAPTER 7Managing Switch Stacks 7-1
Understanding Switch Stacks 7-1
Switch Stack Membership 7-3
Stack Master Election and Re-Election 7-6
Switch Stack Bridge ID and Router MAC Address 7-8
Stack Member Numbers 7-8
Stack Member Priority Values 7-9
Switch Stack Offline Configuration 7-9
Effects of Adding a Provisioned Switch to a Switch Stack 7-10
Effects of Replacing a Provisioned Switch in a Switch Stack 7-11
Effects of Removing a Provisioned Switch from a Switch Stack 7-11

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Hardware Compatibility and SDM Mismatch Mode in Switch Stacks 7-12
Switch Stack Software Compatibility Recommendations 7-12
Stack Protocol Version Compatibility 7-12
Major Version Number Incompatibility Among Switches 7-12
Minor Version Number Incompatibility Among Switches 7-13
Understanding Auto-Upgrade and Auto-Advise 7-13
Auto-Upgrade and Auto-Advise Example Messages 7-14
Incompatible Software and Stack Member Image Upgrades 7-16
Switch Stack Configuration Files 7-16
Additional Considerations for System-Wide Configuration on Switch Stacks 7-17
Switch Stack Management Connectivity 7-18
Connectivity to the Switch Stack Through an IP Address 7-18
Connectivity to the Switch Stack Through an SSH Session 7-18
Connectivity to the Switch Stack Through Console Ports or Ethernet Management Ports 7-18
Connectivity to Specific Stack Members 7-19
Switch Stack Configuration Scenarios 7-19
Configuring the Switch Stack 7-21
Default Switch Stack Configuration 7-21
Enabling Persistent MAC Address 7-21
Assigning Stack Member Information 7-24
Assigning a Stack Member Number 7-24
Setting the Stack Member Priority Value 7-25
Provisioning a New Member for a Switch Stack 7-25
Accessing the CLI of a Specific Stack Member 7-26
Displaying Switch Stack Information 7-27
Troubleshooting Stacks 7-27
Manually Disabling a Stack Port 7-28
Re-Enabling a Stack Port While Another Member Starts 7-28
Understanding the show switch stack-ports summary Output 7-29
Identifying Loopback Problems 7-30
Software Loopback 7-30
Software Loopback Example: No Connected Stack Cable 7-31
Software Loopback Examples: Connected Stack Cables 7-31
Hardware Loopback 7-32
Hardware Loopback Example: LINK OK event 7-32
Hardware Loop Example: LINK NOT OK Event 7-33
Finding a Disconnected Stack Cable 7-33
Fixing a Bad Connection Between Stack Ports 7-34

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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 IEEE 802.1x Port-Based Authentication 9-1
Understanding IEEE 802.1x Port-Based Authentication 9-2
Device Roles 9-3
Authentication Process 9-4
Authentication Initiation and Message Exchange 9-6
Authentication Manager 9-8
Port-Based Authentication Methods 9-8
Per-User ACLs and Filter-Ids 9-9
Authentication Manager CLI Commands 9-9
Ports in Authorized and Unauthorized States 9-11
802.1x Authentication and Switch Stacks 9-12
802.1x Host Mode 9-12
802.1x Multiple Authentication Mode 9-13
MAC Move 9-14
MAC Replace 9-14
802.1x Accounting 9-15
802.1x Accounting Attribute-Value Pairs 9-15
802.1x Readiness Check 9-16
802.1x Authentication with VLAN Assignment 9-16
802.1x Authentication with Per-User ACLs 9-18
802.1x Authentication with Downloadable ACLs and Redirect URLs 9-19
Cisco Secure ACS and Attribute-Value Pairs for the Redirect URL 9-20
Cisco Secure ACS and Attribute-Value Pairs for Downloadable ACLs 9-21
VLAN ID-based MAC Authentication 9-21
802.1x Authentication with Guest VLAN 9-21
802.1x Authentication with Restricted VLAN 9-22
802.1x Authentication with Inaccessible Authentication Bypass 9-23
Overview 9-23
Support on Multiple-Authentication Ports 9-24

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Authentication Results 9-24
Feature Interactions 9-24
802.1x Authentication with Voice VLAN Ports 9-25
802.1x Authentication with Port Security 9-26
802.1x Authentication with Wake-on-LAN 9-26
802.1x User Distribution 9-26
802.1x User Distribution Configuration Guidelines 9-27
802.1x Authentication with MAC Authentication Bypass 9-27
Network Admission Control Layer 2 802.1x Validation 9-28
Flexible Authentication Ordering 9-29
Open1x Authentication 9-29
Multidomain Authentication 9-30
Voice Aware 802.1x Security 9-31
802.1x Supplicant and Authenticator Switches with Network Edge Access Topology (NEAT) 9-31
Guidelines 9-32
Common Session ID 9-32
Configuring 802.1x Authentication 9-33
Default 802.1x Authentication Configuration 9-34
802.1x Authentication Configuration Guidelines 9-35
802.1x Authentication 9-35
VLAN Assignment, Guest VLAN, Restricted VLAN, and Inaccessible Authentication
Bypass 9-36
MAC Authentication Bypass 9-37
Maximum Number of Allowed Devices Per Port 9-37
Configuring 802.1x Violation Modes 9-38
Configuring 802.1x Authentication 9-38
Configuring 802.1x Readiness Check 9-40
Configuring Voice Aware 802.1x Security 9-41
Configuring the Switch-to-RADIUS-Server Communication 9-42
Configuring the Host Mode 9-44
Configuring Periodic Re-Authentication 9-45
Manually Re-Authenticating a Client Connected to a Port 9-46
Changing the Quiet Period 9-46
Changing the Switch-to-Client Retransmission Time 9-46
Setting the Switch-to-Client Frame-Retransmission Number 9-47
Setting the Re-Authentication Number 9-48
Enabling MAC Move 9-48
Enabling MAC Replace 9-49
Configuring 802.1x Accounting 9-50
Configuring a Guest VLAN 9-51

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Configuring a Restricted VLAN 9-52
Configuring the Inaccessible Authentication Bypass Feature 9-53
Configuring 802.1x User Distribution 9-56
Configuring 802.1x Authentication with WoL 9-57
Configuring MAC Authentication Bypass 9-57
Configuring NAC Layer 2 802.1x Validation 9-58
Configuring an Authenticator and a Supplicant Switch with NEAT 9-59
Configuring NEAT with ASP 9-60
Configuring 802.1x Authentication with Downloadable ACLs and Redirect URLs 9-60
Configuring Downloadable ACLs 9-61
Configuring a Downloadable Policy 9-62
Configuring VLAN ID-based MAC Authentication 9-63
Configuring Flexible Authentication Ordering 9-64
Configuring Open1x 9-64
Disabling 802.1x Authentication on the Port 9-65
Resetting the 802.1x Authentication Configuration to the Default Values 9-66
Displaying 802.1x Statistics and Status 9-66
CHAPTER 10 Configuring Web-Based Authentication 10-1
Understanding Web-Based Authentication 10-1
Device Roles 10-2
Host Detection 10-2
Session Creation 10-3
Authentication Process 10-3
Local Web Authentication Banner 10-4
Web Authentication Customizable Web Pages 10-6
Guidelines 10-6
Web-based Authentication Interactions with Other Features 10-7
Port Security 10-7
LAN Port IP 10-8
Gateway IP 10-8
ACLs 10-8
Context-Based Access Control 10-8
802.1x Authentication 10-8
EtherChannel 10-8
Configuring Web-Based Authentication 10-9
Default Web-Based Authentication Configuration 10-9
Web-Based Authentication Configuration Guidelines and Restrictions 10-9
Web-Based Authentication Configuration Task List 10-10

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Configuring the Authentication Rule and Interfaces 10-10
Configuring AAA Authentication 10-11
Configuring Switch-to-RADIUS-Server Communication 10-11
Configuring the HTTP Server 10-13
Customizing the Authentication Proxy Web Pages 10-13
Specifying a Redirection URL for Successful Login 10-15
Configuring the Web-Based Authentication Parameters 10-15
Configuring a Web Authentication Local Banner 10-16
Removing Web-Based Authentication Cache Entries 10-16
Displaying Web-Based Authentication Status 10-17
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 11-3
Routed Ports 11-4
Switch Virtual Interfaces 11-4
SVI Autostate Exclude 11-5
EtherChannel Port Groups 11-6
10-Gigabit Ethernet Interfaces 11-6
Connecting Interfaces 11-6
Using Interface Configuration Mode 11-8
Procedures for Configuring Interfaces 11-9
Configuring a Range of Interfaces 11-9
Configuring and Using Interface Range Macros 11-12
Using the Internal Ethernet Management Port 11-13
Understanding the Internal Ethernet Management Port 11-13
Supported Features on the Ethernet Management Port 11-17
Layer 3 Routing Configuration Guidelines 11-17
Monitoring the Ethernet Management Port 11-18
TFTP and the Ethernet Management Port 11-18
Configuring Ethernet Interfaces 11-18
Default Ethernet Interface Configuration 11-19
Configuring Interface Speed and Duplex Mode 11-20
Speed and Duplex Configuration Guidelines 11-20
Setting the Interface Speed and Duplex Parameters 11-21

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Configuring IEEE 802.3x Flow Control 11-22
Configuring Auto-MDIX on an Interface 11-23
Adding a Description for an Interface 11-24
Configuring Layer 3 Interfaces 11-25
Configuring SVI Autostate Exclude 11-26
Configuring the System MTU 11-27
Monitoring and Maintaining the Interfaces 11-29
Monitoring Interface Status 11-29
Clearing and Resetting Interfaces and Counters 11-30
Shutting Down and Restarting the Interface 11-30
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 12-2
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 13-2
VLAN Port Membership Modes 13-3
Configuring Normal-Range VLANs 13-4
Token Ring VLANs 13-6
Normal-Range VLAN Configuration Guidelines 13-6
Configuring Normal-Range VLANs 13-7
Default Ethernet VLAN Configuration 13-8
Creating or Modifying an Ethernet VLAN 13-8
Deleting a VLAN 13-9
Assigning Static-Access Ports to a VLAN 13-10
Configuring Extended-Range VLANs 13-11
Default VLAN Configuration 13-11
Extended-Range VLAN Configuration Guidelines 13-11
Creating an Extended-Range VLAN 13-12
Creating an Extended-Range VLAN with an Internal VLAN ID 13-13

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Displaying VLANs 13-14
Configuring VLAN Trunks 13-15
Trunking Overview 13-15
IEEE 802.1Q Configuration Considerations 13-17
Default Layer 2 Ethernet Interface VLAN Configuration 13-17
Configuring an Ethernet Interface as a Trunk Port 13-18
Interaction with Other Features 13-18
Configuring a Trunk Port 13-19
Defining the Allowed VLANs on a Trunk 13-20
Changing the Pruning-Eligible List 13-21
Configuring the Native VLAN for Untagged Traffic 13-22
Configuring Trunk Ports for Load Sharing 13-22
Load Sharing Using STP Port Priorities 13-23
Load Sharing Using STP Path Cost 13-24
Configuring VMPS 13-26
Understanding VMPS 13-26
Dynamic-Access Port VLAN Membership 13-27
Default VMPS Client Configuration 13-27
VMPS Configuration Guidelines 13-28
Configuring the VMPS Client 13-28
Entering the IP Address of the VMPS 13-28
Configuring Dynamic-Access Ports on VMPS Clients 13-29
Reconfirming VLAN Memberships 13-29
Changing the Reconfirmation Interval 13-30
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 14-8
Configuring VTP 14-8

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Default VTP Configuration 14-8
VTP Configuration Guidelines 14-9
Domain Names 14-9
Passwords 14-10
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 14-15
Enabling VTP Pruning 14-16
Configuring VTP on a Per-Port Basis 14-16
Adding a VTP Client Switch to a VTP Domain 14-17
Monitoring VTP 14-18
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 16-5
Private VLANs and Unicast, Broadcast, and Multicast Traffic 16-5
Private VLANs and SVIs 16-5
Private VLANs and Switch Stacks 16-6
Configuring Private VLANs 16-6
Tasks for Configuring Private VLANs 16-6
Default Private-VLAN Configuration 16-7
Private-VLAN Configuration Guidelines 16-7

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Secondary and Primary VLAN Configuration 16-7
Private-VLAN Port Configuration 16-9
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 17-6
Understanding Layer 2 Protocol Tunneling 17-7
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 18-12
Spanning Tree and Switch Stacks 18-12
Configuring Spanning-Tree Features 18-13
Default Spanning-Tree Configuration 18-13
Spanning-Tree Configuration Guidelines 18-14
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 19-3
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

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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 19-12
Bridge Protocol Data Unit Format and Processing 19-13
Processing Superior BPDU Information 19-13
Processing Inferior BPDU Information 19-14
Topology Changes 19-14
Configuring MSTP Features 19-15
Default MSTP Configuration 19-15
MSTP Configuration Guidelines 19-16
Specifying the MST Region Configuration and Enabling MSTP 19-17
Configuring the Root Switch 19-18
Configuring a Secondary Root Switch 19-19
Configuring Port Priority 19-20
Configuring Path Cost 19-22
Configuring the Switch Priority 19-23
Configuring the Hello Time 19-23
Configuring the Forwarding-Delay Time 19-24
Configuring the Maximum-Aging Time 19-25
Configuring the Maximum-Hop Count 19-25
Specifying the Link Type to Ensure Rapid Transitions 19-26
Designating the Neighbor Type 19-26
Restarting the Protocol Migration Process 19-27
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 20-3
Understanding BPDU Filtering 20-3
Understanding UplinkFast 20-4
Understanding Cross-Stack UplinkFast 20-5
How CSUF Works 20-6
Events that Cause Fast Convergence 20-7
Understanding BackboneFast 20-7

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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 21-2
VLAN Flex Link Load Balancing and Support 21-3
Flex Link Multicast Fast Convergence 21-3
Learning the Other Flex Link Port as the mrouter Port 21-3
Generating IGMP Reports 21-4
Leaking IGMP Reports 21-4
Configuration Examples 21-4
MAC Address-Table Move Update 21-6
Configuring Flex Links and MAC Address-Table Move Update 21-7
Configuration Guidelines 21-8
Default Configuration 21-8
Configuring Flex Links 21-9
Configuring VLAN Load Balancing on Flex Links 21-11
Configuring the MAC Address-Table Move Update Feature 21-12
Monitoring Flex Links and the MAC Address-Table Move Update Information 21-14
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