Catalyst 2950 and Catalyst 2955 Switch Software Configuration GuideCisco IOS Release 12.1(22)EA2November 2004

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Catalyst 2950 and Catalyst 2955 Switch Software Configuration GuideCopyright 20012004 Cisco Systems, Inc. All rights reserved4

Catalyst 2950 a78-11380-11

C O N T E N T S

Preface xxvii

Audience xxvii

Purpose xxvii

Conventions xxviii

Related Publications xxix

Obtaining Documentation xxixCisco.com xxxOrdering Documentation xxx

Documentation Feedback xxx

Obtaining Technical Assistance xxxCisco Technical Support Website xxxiSubmitting a Service Request xxxiDefinitions of Service Request Severity xxxi

Obtaining Additional Publications and Information xxxii

C H A P T E R 1 Overview 1-1

Features 1-1Ease of Use and Ease of Deployment 1-2Performance 1-3Manageability 1-4Redundancy 1-5VLAN Support 1-6Security 1-6Quality of Service and Class of Service 1-7Monitoring 1-8LRE Features (available only on Catalyst 2950 LRE switches) 1-8

Management Options 1-9Management Interface Options 1-9Advantages of Using Network Assistant and Clustering Switches 1-10

Network Configuration Examples 1-11Design Concepts for Using the Switch 1-11Small to Medium-Sized Network Configuration 1-14Collapsed Backbone and Switch Cluster Configuration 1-15Hotel Network Configuration 1-16

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Contents

Service-Provider Central-Office Configuration 1-19Large Campus Configuration 1-20Multidwelling Network Using Catalyst 2950 Switches 1-21Long-Distance, High-Bandwidth Transport Configuration 1-23

Where to Go Next 1-23

C H A P T E R 2 Using the Command-Line Interface 2-1

Cisco IOS Command Modes 2-1

Getting Help 2-3

Abbreviating Commands 2-4

Using no and default Forms of Commands 2-4

Understanding CLI Messages 2-5

Using Command History 2-5Changing the Command History Buffer Size 2-5Recalling Commands 2-6Disabling the Command History Feature 2-6

Using Editing Features 2-6Enabling and Disabling Editing Features 2-7Editing Commands through Keystrokes 2-7Editing Command Lines that Wrap 2-8

Searching and Filtering Output of show and more Commands 2-9

Accessing the CLI 2-10

C H A P T E R 3 Configuring Catalyst 2955 Switch Alarms 3-1

Understanding Catalyst 2955 Switch Alarms 3-1Global Status Monitoring Alarms 3-2FCS Error Hysteresis Threshold 3-2Port Status Monitoring Alarms 3-3Triggering Alarm Options 3-3

Configuring Catalyst 2955 Switch Alarms 3-4Default Catalyst 2955 Switch Alarm Configuration 3-4Configuring the Power Supply Alarm 3-5

Setting the Power Mode 3-5Setting the Power Supply Alarm Options 3-5

Configuring the Switch Temperature Alarms 3-6Setting a Secondary Temperature Threshold for the Switch 3-6Associating the Temperature Alarms to a Relay 3-7

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Configuring the FCS Bit Error Rate Alarm 3-7Setting the FCS Error Threshold 3-8Setting the FCS Error Hysteresis Threshold 3-8

Configuring Alarm Profiles 3-9Creating or Modifying an Alarm Profile 3-9Attaching an Alarm Profile to a Specific Port 3-10

Enabling SNMP Traps 3-11

Displaying Catalyst 2955 Switch Alarms Status 3-11

C H A P T E R 4 Assigning the Switch IP Address and Default Gateway 4-1

Understanding the Boot Process 4-1

Assigning Switch Information 4-2Default Switch Information 4-3Understanding DHCP-Based Autoconfiguration 4-3

DHCP Client Request Process 4-4Configuring DHCP-Based Autoconfiguration 4-5

DHCP Server Configuration Guidelines 4-5Configuring the TFTP Server 4-6Configuring the DNS 4-6Configuring the Relay Device 4-7Obtaining Configuration Files 4-7Example Configuration 4-8

Manually Assigning IP Information 4-10

Checking and Saving the Running Configuration 4-11

Modifying the Startup Configuration 4-11Default Boot Configuration 4-11Automatically Downloading a Configuration File 4-12Specifying the Filename to Read and Write the System Configuration 4-12Booting Manually 4-12Booting a Specific Software Image 4-13Controlling Environment Variables 4-14

Scheduling a Reload of the Software Image 4-16Configuring a Scheduled Reload 4-16Displaying Scheduled Reload Information 4-17

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C H A P T E R 5 Configuring IE2100 CNS Agents 5-1

Understanding IE2100 Series Configuration Registrar Software 5-1CNS Configuration Service 5-2CNS Event Service 5-3

NameSpace Mapper 5-3What You Should Know About ConfigID, DeviceID, and Host Name 5-3

ConfigID 5-3DeviceID 5-4Host Name and DeviceID 5-4Using Host Name, DeviceID, and ConfigID 5-4

Understanding CNS Embedded Agents 5-5Initial Configuration 5-5Incremental (Partial) Configuration 5-6Synchronized Configuration 5-6

Configuring CNS Embedded Agents 5-6Enabling Automated CNS Configuration 5-6Enabling the CNS Event Agent 5-8Enabling the CNS Configuration Agent 5-9

Enabling an Initial Configuration 5-9Enabling a Partial Configuration 5-12

Displaying CNS Configuration 5-13

C H A P T E R 6 Clustering Switches 6-1

Understanding Switch Clusters 6-1Clustering Overview 6-1Cluster Command Switch Characteristics 6-2Standby Command Switch Characteristics 6-2Candidate Switch and Member Switch Characteristics 6-3

Using the CLI to Manage Switch Clusters 6-4Catalyst 1900 and Catalyst 2820 CLI Considerations 6-4

Using SNMP to Manage Switch Clusters 6-4

C H A P T E R 7 Administering the Switch 7-1

Managing the System Time and Date 7-1Understanding the System Clock 7-1Understanding Network Time Protocol 7-2

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Configuring NTP 7-3Default NTP Configuration 7-4Configuring NTP Authentication 7-4Configuring NTP Associations 7-5Configuring NTP Broadcast Service 7-6Configuring NTP Access Restrictions 7-8Configuring the Source IP Address for NTP Packets 7-10Displaying the NTP Configuration 7-10

Configuring Time and Date Manually 7-11Setting the System Clock 7-11Displaying the Time and Date Configuration 7-12Configuring the Time Zone 7-12Configuring Summer Time (Daylight Saving Time) 7-13

Configuring a System Name and Prompt 7-15Default System Name and Prompt Configuration 7-15Configuring a System Name 7-15Configuring a System Prompt 7-