Cisco 3750 - Catalyst EMI Switch User manual

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Catalyst 3750 Metro Switch
Software Configuration Guide
Cisco IOS Release 12.1(14)AX
January 2004
Customer Order Number: DOC-7815870=
Text Part Number: 78-15870-01

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Catalyst 3750 Metro Switch Software Configuration Guide
Copyright © 2004 Cisco Systems, Inc. All rights reserved.

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CONTENTS
Preface xxxiii
Audience xxxiii
Purpose xxxiii
Conventions xxxiv
Related Publications xxxv
Obtaining Documentation xxxv
Cisco.com xxxv
Ordering Documentation xxxvi
Documentation Feedback xxxvi
Obtaining Technical Assistance xxxvi
Cisco TAC Website xxxvi
Opening a TAC Case xxxvii
TAC CasePriority Definitions xxxvii
Obtaining AdditionalPublications and Information xxxviii
CHAPTER 1Overview 1-1
Features 1-1
Default Settings After Initial Switch Configuration 1-8
Network Configuration Examples 1-11
Multidwelling or Ethernet-to-the Subscriber Network 1-11
Ethernet Broadband Aggregation Network 1-13
Layer 2 VPN Application 1-14
Layer 3 VPN Application 1-15
Where to Go Next 1-16
CHAPTER 2Using the Command-Line Interface 2-1
Understanding Command Modes 2-1
Understanding the Help System 2-3
Understanding Abbreviated Commands 2-4
Understanding no and default Forms ofCommands 2-4
Understanding CLI Error Messages 2-5

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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 2-7
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
Accessing the CLI from a Browser 2-10
CHAPTER 3Assigning the Switch IP Address and DefaultGateway 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 3-4
Configuring the DHCP Server 3-5
Configuring the TFTP Server 3-5
Configuring the DNS 3-6
Configuring the Relay Device 3-6
Obtaining Configuration Files 3-7
Example Configuration 3-8
Manually Assigning IP Information 3-9
Checking and Saving the Running Configuration 3-10
Modifying the Startup Configuration 3-10
Default Boot Configuration 3-11
Automatically Downloading a Configuration File 3-11
Specifying the Filename to Read and Write the System Configuration 3-11
Booting Manually 3-12
Booting a Specific Software Image 3-12
Controlling Environment Variables 3-13
Scheduling a Reload of the Software Image 3-15
Configuring a Scheduled Reload 3-15
Displaying Scheduled Reload Information 3-16

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CHAPTER 4Configuring IE2100 CNS Agents 4-1
Understanding IE2100 Series Configuration Registrar Software 4-1
CNS Configuration Service 4-2
CNS Event Service 4-3
NameSpace Mapper 4-3
ConfigurationRegistrar and ConfigID, DeviceID, and HostName 4-3
ConfigID 4-3
DeviceID 4-4
Host Name and DeviceID 4-4
Using Host Name, DeviceID, and ConfigID 4-4
Understanding CNS Embedded Agents 4-5
Initial Configuration 4-5
Incremental (Partial) Configuration 4-6
Synchronized Configuration 4-6
Configuring CNS Embedded Agents 4-6
Enabling Automated CNS Configuration 4-6
Enabling the CNS Event Agent 4-8
Enabling the CNS Configuration Agent 4-9
Enabling an Initial Configuration 4-9
Enabling a Partial Configuration 4-11
Displaying CNS Configuration 4-12
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
Configuring NTP 5-4
Default NTP Configuration 5-4
Configuring NTP Authentication 5-5
Configuring NTP Associations 5-6
Configuring NTP Broadcast Service 5-7
Configuring NTP Access Restrictions 5-8
Configuring the Source IP Address for NTP Packets 5-10
Displaying the NTP Configuration 5-11
Configuring Time and Date Manually 5-11
Setting the System Clock 5-11
Displaying the Time and Date Configuration 5-12
Configuring the Time Zone 5-12
Configuring Summer Time (Daylight Saving Time) 5-13

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Configuring a System Nameand Prompt 5-15
Default System Name and Prompt Configuration 5-15
Configuring a System Name 5-15
Configuring a System Prompt 5-16
Understanding DNS 5-16
Default DNS Configuration 5-17
Setting Up DNS 5-17
Displaying the DNS Configuration 5-18
Creating a Banner 5-18
Default Banner Configuration 5-18
Configuring a Message-of-the-Day Login Banner 5-19
Configuring a Login Banner 5-20
Managing the MAC Address Table 5-20
Building the Address Table 5-21
MAC Addresses and VLANs 5-21
Default MAC Address Table Configuration 5-21
Changing the Address Aging Time 5-22
Removing Dynamic Address Entries 5-22
Configuring MAC AddressNotification Traps 5-23
Adding and Removing Static Address Entries 5-24
Displaying Address Table Entries 5-25
Managing the ARP Table 5-26
CHAPTER 6Configuring SDM Templates 6-1
Understanding the SDM Templates 6-1
Configuring the Switch SDM Template 6-2
Default SDM Template 6-2
SDM Template Configuration Guidelines 6-3
Setting the SDM Template 6-3
Displaying the SDM Templates 6-4
CHAPTER 7Configuring Switch-Based Authentication 7-1
Preventing Unauthorized Access to Your Switch 7-1
Protecting Access to Privileged EXEC Commands 7-2
Default Password and Privilege Level Configuration 7-2
Setting or Changing a Static Enable Password 7-3
Protecting Enable and Enable Secret Passwords with Encryption 7-3
Disabling Password Recovery 7-5
Setting a Telnet Password for a Terminal Line 7-6

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Configuring Username and Password Pairs 7-6
Configuring Multiple Privilege Levels 7-8
Setting the Privilege Level for a Command 7-8
Changing the Default Privilege Level for Lines 7-9
Logging into and Exiting a Privilege Level 7-10
Controlling Switch Access with TACACS+ 7-10
Understanding TACACS+ 7-10
TACACS+ Operation 7-12
Configuring TACACS+ 7-12
Default TACACS+ Configuration 7-13
Identifying the TACACS+ Server Host and Setting the Authentication Key 7-13
Configuring TACACS+ Login Authentication 7-14
Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services 7-16
Starting TACACS+ Accounting 7-16
Displaying the TACACS+ Configuration 7-17
Controlling Switch Access with RADIUS 7-17
Understanding RADIUS 7-18
RADIUS Operation 7-19
Configuring RADIUS 7-20
Default RADIUS Configuration 7-20
Identifying the RADIUS Server Host 7-20
Configuring RADIUS Login Authentication 7-23
Defining AAA Server Groups 7-25
Configuring RADIUS Authorization for User Privileged Access and Network Services 7-27
Starting RADIUS Accounting 7-28
Configuring Settings for All RADIUS Servers 7-28
Configuring the Switch to Use Vendor-Specific RADIUS Attributes 7-29
Configuring the Switch for Vendor-Proprietary RADIUS Server Communication 7-30
Displaying the RADIUS Configuration 7-31
Controlling Switch Access with Kerberos 7-31
Understanding Kerberos 7-32
Kerberos Operation 7-34
Authenticating to a Boundary Switch 7-34
Obtaining a TGT from a KDC 7-35
Authenticating to Network Services 7-35
Configuring Kerberos 7-35
Configuring the Switch for Local Authentication and Authorization 7-36

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Configuring the Switch for Secure Shell 7-37
Understanding SSH 7-37
Configuring SSH 7-37
CHAPTER 8Configuring 802.1x Port-Based Authentication 8-1
Understanding 802.1x Port-Based Authentication 8-1
Device Roles 8-2
Authentication Initiation and Message Exchange 8-3
Ports in Authorized and Unauthorized States 8-4
Supported Topologies 8-5
Using 802.1x with Port Security 8-6
Using 802.1x with Voice VLAN Ports 8-6
Using 802.1x with VLAN Assignment 8-7
Using 802.1x with Guest VLAN 8-8
Using 802.1x with Per-User ACLs 8-8
Configuring 802.1x Authentication 8-9
Default 802.1x Configuration 8-10
802.1x Configuration Guidelines 8-11
Configuring 802.1x Authentication 8-11
Configuring the Switch-to-RADIUS-ServerCommunication 8-13
Configuring Periodic Re-Authentication 8-14
Manually Re-Authenticating a Client Connected to a Port 8-14
Changing the Quiet Period 8-15
Changing the Switch-to-Client Retransmission Time 8-15
Setting the Switch-to-Client Frame-Retransmission Number 8-16
Configuring the Host Mode 8-17
Configuring a Guest VLAN 8-18
Resetting the 802.1x Configuration to theDefault Values 8-18
Displaying 802.1x Statistics and Status 8-19
CHAPTER 9Configuring Interface Characteristics 9-1
Understanding Interface Types 9-1
Port-Based VLANs 9-2
Switch Ports 9-2
Access Ports 9-2
Trunk Ports 9-3
Tunnel Ports 9-3
Routed Ports 9-4
Switch Virtual Interfaces 9-4

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EtherChannelPort Groups 9-5
Connecting Interfaces 9-5
Using Interface Configuration Mode 9-6
Procedures for Configuring Interfaces 9-7
Configuring a Range of Interfaces 9-8
Configuring and Using Interface Range Macros 9-9
Configuring EthernetInterfaces 9-11
Default Ethernet Interface Configuration 9-11
Configuring Interface Speed and Duplex Mode 9-12
ConfigurationGuidelines 9-13
Setting the Interface Speed and Duplex Parameters 9-13
Configuring IEEE 802.3z Flow Control 9-15
Configuring Auto-MDIX on a Port 9-16
Adding a Description for an Interface 9-17
Configuring Layer 3 Interfaces 9-18
Configuring the System MTU 9-19
Monitoring and Maintaining the Interfaces 9-20
Monitoring Interface Status 9-20
Clearing and Resetting Interfaces and Counters 9-21
Shutting Down and Restarting the Interface 9-22
CHAPTER 10 Configuring VLANs 10-1
Understanding VLANs 10-1
Supported VLANs 10-3
VLAN Port Membership Modes 10-3
Configuring Normal-Range VLANs 10-4
Token Ring VLANs 10-6
Normal-Range VLAN Configuration Guidelines 10-6
VLAN Configuration Mode Options 10-7
VLAN Configuration in config-vlan Mode 10-7
VLAN Configuration in VLAN Database Configuration Mode 10-7
Saving VLAN Configuration 10-7
Default Ethernet VLAN Configuration 10-8
Creating or Modifying an Ethernet VLAN 10-9
Deleting a VLAN 10-11
Assigning Static-Access Ports to a VLAN 10-11

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Configuring Extended-Range VLANs 10-12
Default VLAN Configuration 10-13
Extended-Range VLAN Configuration Guidelines 10-13
Creating an Extended-Range VLAN 10-14
Creating an Extended-Range VLAN with an Internal VLAN ID 10-15
Displaying VLANs 10-16
Configuring VLAN Trunks 10-16
Trunking Overview 10-16
Encapsulation Types 10-18
802.1Q Configuration Considerations 10-19
Default Layer 2 Ethernet Interface VLAN Configuration 10-19
Configuring an Ethernet Interface as a Trunk Port 10-20
Interaction with Other Features 10-20
Configuring a Trunk Port 10-21
Defining the Allowed VLANs on a Trunk 10-22
Changing the Pruning-Eligible List 10-23
Configuring the Native VLAN for Untagged Traffic 10-24
Configuring Trunk Ports for Load Sharing 10-24
Load Sharing Using STP Port Priorities 10-25
Load Sharing Using STP Path Cost 10-26
Configuring VMPS 10-28
Understanding VMPS 10-28
Dynamic-Access Port VLAN Membership 10-29
Default VMPS ClientConfiguration 10-29
VMPS Configuration Guidelines 10-29
Configuring the VMPS Client 10-30
Entering the IP Address of the VMPS 10-30
Configuring Dynamic-Access Ports on VMPS Clients 10-31
Reconfirming VLAN Memberships 10-31
Changing the Reconfirmation Interval 10-32
Changing the Retry Count 10-32
Monitoring the VMPS 10-33
Troubleshooting Dynamic-Access Port VLAN Membership 10-33
VMPS Configuration Example 10-34