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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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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
© 2007 Cisco Systems, Inc. All rights reserved.
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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
Contents
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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
Contents
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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
Contents
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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
Contents
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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
Contents
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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
Contents
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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
Contents
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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
xix
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
xx
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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Cisco Systems Webcam 3750E User manual

Category
Software
Type
User manual
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