Cisco WS-C2950SX-48-SI

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Cisco Systems, Inc.

170 West Tasman Drive

San Jose, CA 95134-1706

USA

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Tel: 408 526-4000

800 553-NETS (6387)

Fax: 408 526-4100

Catalyst 4500 Series, Catalyst 2948G,

Catalyst 2980G Switches Software

Configuration Guide

Software Release 8.1

Customer Order Number: DOC-7815486=

Text Part Number: 78-15486-01

Main Page

Default Chapter1
- Configuration Guide1
- Table of Contents3
- Related Documentation25
- Obtaining Documentation27
  - Ordering Documentation27
  - Documentation Feedback28
- Obtaining Technical Assistance28
  - Technical Assistance Center29
- Obtaining Additional Publications and Information30
- Catalyst 4000 Series Switches31
- Product Overview31
Chapter 1 Product Overview32
- Catalyst 2980G Switch33
- Supervisor Engine Software33
  - Catalyst 2980G Switch34
  - Supervisor Engine Software34
CHAPTER 2 Using the Command-Line Interface35
- Switch CLI Overview35
- C H a P T E R 2 Using the Command-Line Interface36
- Accessing the Switch CLI36
- Accessing Help38
- Command-Line Editing39
- History Substitution40
- Abbreviating a Command40
- Completing a Partial Command40
- Scrolling through Command Output40
- Catalyst 4000 Series Switches41
- Using Command Aliases41
- Specifying Modules, Ports, and Vlans41
- Specifying MAC Addresses42
- Specifying IP Addresses, Host Names, and IP Aliases42
- ROM Monitor CLI43
- Example of a Catalyst 4003 Bootup Display43
CHAPTER 3 Configuring the Switch IP Address and Default Gateway45
- Understanding How the Switch Management Interfaces Work45
- C H a P T E R 3 Configuring the Switch IP Address and Default Gateway46
- Understanding How Automatic IP Configuration Works46
- Preparing to Configure the IP Address and Default Gateway48
- Default IP Address and Default Gateway Configuration49
- Setting the In-Band (Sc0) Interface IP Address49
- Setting the Management Ethernet (Me1) Interface IP Address50
- Configuring Default Gateways50
- Configuring the SLIP (Sl0) Interface on the Console Port52
- Using DHCP or RARP to Obtain an IP Address Configuration53
- Renewing and Releasing a DHCP-Assigned IP Address54
CHAPTER 4 Configuring Ethernet and Fast Ethernet Switching57
- Understanding How Ethernet Works57
- Default Ethernet and Fast Ethernet Configurations58
- Configuring Ethernet and Fast Ethernet Ports59
Chapter 5 Configuring Gigabit Ethernet Switching65
- Understanding How Gigabit Ethernet Works65
- Default Gigabit Ethernet Configuration70
- Configuring Gigabit Ethernet Ports71
CHAPTER 6 Configuring Fast Etherchannel and Gigabit Etherchannel75
- Understanding How Etherchannel Works75
- Pagp and LACP76
- Etherchannel Configuration Guidelines and Restrictions77
- Understanding the Pagp79
  - Pagp Modes79
  - Understanding Administrative Groups and Etherchannel Ids80
- Configuring Etherchannel Using Pagp80
- Etherchannel Configuration Examples86
  - Configuration Example of a Four-Port Fast Etherchannel86
  - Configuration Example of Two-Port Gigabit Etherchannel88
- Understanding the LACP90
  - LACP Modes90
  - LACP Parameters91
- Configuring Etherchannel Using LACP92
Chapter 7 Configuring Spanning Tree98
- Understanding How Stps Work98
- Understanding How PVST+ and MISTP Modes Work107
- Understanding How Bridge Identifiers Work109
  - MAC Address Allocation109
  - MAC Address Reduction109
- Understanding How MST Works110
- Understanding How BPDU Skewing Works118
- Using PVST118
- Using Rapid PVST124
- Using MISTP-PVST+ or MISTP126
- Configuring a Root Switch135
- Configuring Spanning Tree Timers140
- Configuring MST142
  - Enabling MST142
  - Mapping and Unmapping Vlans to an MST Instance150
- Configuring Spanning Tree BPDU Skewing153
CHAPTER 8 Configuring Spanning Tree Portfast, BPDU Guard, BPDU Filter, Uplinkfast, Backbonefast, and157
- Understanding How Portfast Works157
- Understanding How Portfast BPDU Guard Works158
- Understanding How Portfast BPDU Filtering Works158
- Understanding How Uplinkfast Works159
- Understanding How Backbonefast Works160
- Understanding How Loop Guard Works162
- Configuring Portfast164
- Configuring Portfast BPDU Guard167
  - Enabling Portfast BPDU Guard167
  - Disabling Portfast BPDU Guard168
- Configuring Portfast BPDU Filtering169
  - Enabling Portfast BPDU Filtering169
  - Disabling Portfast BPDU Filtering170
- Configuring Uplinkfast171
  - Enabling Uplinkfast171
  - Disabling Uplinkfast172
- Configuring Backbonefast173
- Configuring Loop Guard174
  - Enabling Loop Guard174
  - Disabling Loop Guard175
- Configuring VTP177
- Understanding How VTP Version 1 and Version 2 Work177
Chapter 9 Configuring VTP178
- Understanding the VTP Domain178
- Understanding VTP Modes178
- Understanding VTP Advertisements179
- Understanding VTP Version 2179
- Understanding VTP Pruning180
- Default VTP Version 1 and Version 2 Configuration181
- VTP Version 1 and Version 2 Configuration Guidelines182
- Configuring VTP Version 1 and Version 2183
- Understanding How VTP Version 3 Works189
- Default VTP Version 3 Configuration198
- Configuring VTP Version 3198
- Understanding How Vlans Work207
Chapter 10 Configuring VLAN208
- VLAN Ranges209
- Configurable VLAN Parameters210
- VLAN Default Configuration210
- VLAN Configuration Guidelines211
- Configuring Vlans on the Switch212
- Configuring Auxiliary Vlans219
  - Understanding Auxiliary Vlans219
- Configuring Private Vlans222
Chapter 11 Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports231
- Understanding How VLAN Trunks Work231
- Default Trunk Configuration235
- Configuring a Trunk Link235
- Disabling VLAN 1 on a Trunk Link238
- Example VLAN Trunk Configurations239
Chapter 12 Configuring Dynamic VLAN Membership with VMPS253
- Understanding How VMPS Works253
- VMPS and Dynamic Port Hardware and Software Requirements254
- Default VMPS and Dynamic Port Configuration255
- Configuration Guidelines for Dynamic Ports and VMPS255
- Configuring VMPS256
  - Creating the VMPS Database256
- Catalyst 2948G Switch257
- Troubleshooting VMPS and Dynamic Port VLAN Membership263
  - Troubleshooting VMPS263
  - Troubleshooting Dynamic Ports263
- VMPS Example264
- Dynamic Port VLAN Membership with Auxiliary Vlans266
  - Configuration Guidelines267
  - Configuring Dynamic Port VLAN Membership with Auxiliary Vlans267
Chapter 13 Configuring GVRP269
- Understanding How GVRP Works269
- GVRP Hardware and Software Requirements269
- Default GVRP Configuration270
- GVRP Configuration Guidelines270
- Configuring GVRP on the Switch270
Configuring Qos277
- Understanding How Qos Works277
  - Qos Overview277
Chapter 14 Configuring Qo278
- Understanding Qos Terminology278
- Understanding Classification and Marking at the Ingress Port279
- Understanding Scheduling279
- Software Requirements280
- Qos Default Configuration280
- Configuring Qos on the Switch280
Chapter 15 Configuring Multicast Services285
- Understanding How Multicasting Works285
- Configuring CGMP288
- Configuring GMRP293
- Configuring Multicast Router Ports and Group Entries299
- Filtering IGMP Traffic301
Chapter 16 Configuring Port Security309
- Understanding How Port Security Works309
- Port Security Configuration Guidelines311
- Configuring Port Security on the Switch311
- Monitoring Port Security318
Chapter 17 Configuring Unicast Flood Blocking321
- Understanding How Unicast Flood Blocking Works321
- Configuration Guidelines for Unicast Flood Blocking322
- Configuring Unicast Flood Blocking on the Switch322
Chapter 18 Configuring the IP Permit List325
- Understanding How the IP Permit List Works325
- IP Permit List Default Configuration326
- Configuring the IP Permit List on the Switch326
Chapter 19 Configuring Protocol Filtering331
- Understanding How Protocol Filtering Works331
- Default Protocol Filtering Configuration332
- Configuring Protocol Filtering on the Switch332
  - Configuring Protocol Filtering332
  - Disabling Protocol Filtering333
Chapter 20 Checking Status and Connectivity335
- Checking Module Status335
- Checking Port Status336
- Displaying the Port MAC Address338
- Displaying Port Capabilities339
- Using Telnet340
- Changing the Login Timer340
- Using Secure Shell Encryption for Telnet Sessions341
- Monitoring User Sessions342
- Using Ping343
  - Understanding How Ping Works343
  - Executing Ping344
- Using Layer 2 Traceroute345
  - Layer 2 Traceroute Usage Guidelines345
  - Identifying a Layer 2 Path345
- Using IP Traceroute346
  - Understanding How IP Traceroute Works346
  - Executing IP Traceroute346
Chapter 21 Configuring CDP349
- Understanding How CDP Works349
- Default CDP Configuration350
- Configuring CDP on the Switch350
Chapter 22 Using Switch Topn Reports355
- Understanding How Switch Topn Reports Works355
- Running and Viewing Switch Topn Reports357
- Running and Viewing Switch Topn Reports358
Chapter 23 Configuring UDLD361
- Understanding How UDLD Works361
- UDLD Software and Hardware Requirements362
- Default UDLD Configuration362
- Configuring UDLD on the Switch363
Chapter 24 Configuring SNMP369
- SNMP Terminology369
- SNMP Terminology370
- Understanding How SNMP Works371
- Understanding How Snmpv1 and Snmpv2C Work373
- Snmpv1 and Snmpv2C Default Configuration374
- Configuring Snmpv1 and Snmpv2C from an NMS374
- Configuring Snmpv1 and Snmpv2C from the CLI374
  - Snmpv1 and Snmpv2C Enhancements in Software Release 7.5(1)376
- Understanding Snmpv3379
  - Benefits of Snmpv3379
  - SNMP Entity379
- Configuring Snmpv3 from an NMS382
- Configuring Snmpv3 from the CLI382
- Using Ciscoworks2000385
Chapter 25 Configuring RMON387
- Understanding How RMON Works387
- Enabling RMON388
- Viewing RMON Data388
- Supported RMON and RMON2 MIB Objects388
Chapter 26 Configuring SPAN and RSPAN391
- Understanding How SPAN and RSPAN Work391
- Vspan393
Chapter 27 Administering the Switch409
- Setting the System Name and System Prompt409
  - Configuring the System Name and Prompt410
- Setting the System Contact and Location411
- Setting the System Clock412
- Creating a Login Banner412
  - Configuring a Login Banner412
  - Clearing the Login Banner413
Enabling or Disabling the "Cisco Systems Console" Telnet Login Banner413
- Defining and Using Command Aliases414
- Defining and Using IP Aliases415
- Configuring Permanent and Static ARP Entries416
- Configuring Static Routes417
- Scheduling a System Reset418
  - Scheduling a Reset at a Specific Time418
  - Scheduling a Reset Within a Specified Amount of Time419
- Generating System Status Reports for Tech Support420
Chapter 28 Power Management421
- Understanding How Power Management Works on the Catalyst 4500 Series Switches421
- Understanding How Power Management Works on the Catalyst 4006 Switch426
- Power Consumption for Modules429
- Migrating a Supervisor Engine II from a Catalyst 4006 Switch to a Catalyst 4500 Series Switch430
- Understanding How Inline Power Works431
- Configuring Power Management434
- Configuring Inline Power438
Chapter 29 Configuring Voip441
- Hardware and Software Requirements441
- Overview of IP Phones442
- Configuring Voip on a Switch443
- Configuring Voip on a Switch444
Chapter 30 Configuring Switch Access Using AAA445
- Understanding How Authentication Works445
- Configuring Authentication452
- Authentication Example484
- Understanding How Authorization Works485
- Configuring Authorization487
- Authorization Example490
- Understanding How Accounting Works491
- Configuring Accounting494
- Accounting Example497
Chapter 31 Configuring 802.1X Authentication499
- Understanding How 802.1X Authentication Works499
- Authentication Default Configuration505
- Authentication Configuration Guidelines506
- Configuring 802.1X Authentication on the Switch506
Chapter 32 Modifying the Switch Boot Configuration517
- Understanding How the Switch Boot Configuration Works517
- Default Switch Boot Configuration520
- Setting the Configuration Register520
- Setting the BOOT Environment Variable522
  - Clearing the BOOT Environment Variable Settings523
- Setting and Clearing the CONFIG_FILE Environment Variable523
  - Setting the CONFIG_FILE Environment Variable523
  - Clearing CONFIG_FILE Environment Variable Entries524
- Displaying the Switch Boot Configuration524
Chapter 33 Working with System Software Images525
- Software Image Naming Conventions525
- Downloading System Software Images to the Switch Using TFTP525
- Uploading System Software Images to a TFTP Server528
  - Preparing to Upload an Image to a TFTP Server529
  - Uploading Software Images to a TFTP Server529
- Downloading System Software Images to the Switch Using Rcp529
- Uploading System Software Images to an Rcp Server532
  - Preparing to Upload an Image to an Rcp Server533
  - Uploading Software Images to an Rcp Server533
- Upgrading the ROM Monitor533
Chapter 34 Working with the Flash File System539
- Working with the Flash File System on the Switch539
Chapter 35 Working with Configuration Files547
- Creating and Using Configuration Files Guidelines547
- Creating a Configuration File548
- Configuring the Switch Using a File in Flash Memory548
- Copying Configuration Files Using TFTP549
  - Downloading Configuration Files from a TFTP Server549
  - Uploading Configuration Files to a TFTP Server550
- Copying Configuration Files Using Rcp551
  - Downloading Configuration Files from an Rcp Server552
  - Uploading Configuration Files to an Rcp Server553
- Clearing the Configuration554
Chapter 36 Configuring Switch Acceleration555
- Understanding How Switch Acceleration Works555
- Configuring Switch Acceleration on the Switch556
  - Enabling Switch Acceleration557
  - Displaying Switch Acceleration Information557
- Backplane Channel Module557
Chapter 37 Configuring System Message Logging559
- Understanding How System Message Logging Works559
- System Log Message Format561
Chapter 38 Configuring DNS571
- Understanding How DNS Works571
- Default DNS Configuration571
- Configuring DNS on the Switch572
Chapter 39 Configuring NTP575
- Understanding How NTP Works575
- Default NTP Configuration576
- Configuring NTP on the Switch576
Appendix583
A Acronyms583
Appendix A Acronym585
- Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide — Release585
I N D E X593

Brand	Cisco
Model	WS-C2950SX-48-SI
Category	Switch
Language	English

Cisco WS-C2950SX-48-SI - User Manual

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Cisco WS-C2950SX-48-SI Specifications

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