Name: Cisco WS-C3750-48PS-S
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11-6

Catalyst 3750 Switch Software Configuration Guide

78-16180-02

Chapter 11 Configuring Interface Characteristics

Understanding Interface Types

Figure 11-1 Connecting VLANs with Layer 2 Switches

By using the switch with routing enabled, when you configure VLAN 20 and VLAN 30 each with an

SVI to which an IP address is assigned, packets can be sent from Host A to Host B directly through the

switch with no need for an external router (Figure 11-2).

Figure 11-2 Connecting VLANs with the Catalyst 3750 Switch

Host A

Switch

Cisco router

VLAN 20

Host B

VLAN 30

46647

Host A

SVI 1172.20.128.1 172.20.129.1SVI 2

Layer 3 switch

with routing enabled

VLAN 20

Host B

VLAN 30

101350

Default Chapter3
- Table of Contents3
- Obtaining Documentation37
  - Ordering Documentation38
- Related Publications37
- Documentation Feedback38
- Obtaining Technical Assistance38
- Obtaining Additional Publications and Information40
Chapter 1 Overview42
- Features42
- Default Settings after Initial Switch Configuration50
- Network Configuration Examples53
Chapter 4 Assigning the Switch IP Address and Default Gateway63
- Long-Distance, High-Bandwidth Transport Configuration63
- Where to Go Next64
Understanding Command Modes65
- C H a P T E R 2 Using the Command-Line Interface66
Understanding the Help System67
Understanding Abbreviated Commands67
Understanding no and Default Forms of Commands68
Understanding CLI Error Messages68
Using Command History68
- Changing the Command History Buffer Size69
- Disabling the Command History Feature69
- Recalling Commands69
- Editing Commands through Keystrokes70
- Enabling and Disabling Editing Features70
Using Editing Features70
- Editing Command Lines that Wrap72
Searching and Filtering Output of Show and more Commands72
Accessing the CLI73
- Accessing the CLI through a Console Connection or through Telnet73
- Accessing the CLI from a Browser74
- Understanding CMS75
Chapter 3 Getting Started with CM76
- Front Panel View76
- Topology View76
- CMS Menu Bar, Toolbar, and Feature Bar76
- Online Help79
- Configuration Modes79
  - Guide Mode79
  - Expert Mode80
- Wizards80
- Privilege Levels81
- Access to Older Switches in a Cluster81
- Configuring CMS82
- Displaying CMS85
- Default Boot Configuration102
- Automatically Downloading a Configuration File102
  - Specifying the Filename to Read and Write the System Configuration102
- Booting Manually103
- Booting a Specific Software Image103
- Controlling Environment Variables104
Managing Switch Stacks109
- Understanding Switch Stacks109
Chapter 5 Managing Switch Stack110
- Switch Stack Membership111
- Stack Master Election and Re-Election112
- Switch Stack Bridge ID and Router MAC Address113
- Stack Member Numbers114
- Stack Member Priority Values115
- Switch Stack Offline Configuration115
- Assigning Stack Member Information125
- Accessing the CLI of a Specific Stack Member127
- Displaying Switch Stack Information128
Clustering Switches129
Chapter 6 Clustering Switche130
- Understanding Switch Clusters130
- Planning a Switch Cluster132
- Automatic Discovery of Cluster Candidates and Members133
- HSRP and Standby Cluster Command Switches138
- IP Addresses141
- Host Names141
- SNMP Community Strings142
- Switch Clusters and Switch Stacks142
- Passwords142
- TACACS+ and RADIUS144
- Access Modes in CMS144
- LRE Profiles145
- Availability of Switch-Specific Features in Switch Clusters145
  - Creating a Switch Cluster145
Chapter 7 Administering the Switch154
- Understanding the System Clock154
- Understanding Network Time Protocol154
- Configuring NTP156
- Configuring Time and Date Manually163
- Configuring a System Name and Prompt166
- MAC Addresses and Switch Stacks174
- Default MAC Address Table Configuration174
- Changing the Address Aging Time174
- Removing Dynamic Address Entries175
- Configuring MAC Address Notification Traps175
- Adding and Removing Static Address Entries177
- Configuring Unicast MAC Address Filtering178
- Displaying Address Table Entries180
Configuring SDM Templates181
- Understanding the SDM Templates181
  - SDM Templates and Switch Stacks182
- Configuring the Switch SDM Template183
- Displaying the SDM Templates185
Chapter 9 Configuring Switch-Based Authentication187
- Preventing Unauthorized Access to Your Switch187
- Protecting Access to Privileged EXEC Commands188
Controlling Switch Access with TACACS196
- Understanding TACACS196
- TACACS+ Operation198
- Configuring TACACS199
- Displaying the TACACS+ Configuration203
Controlling Switch Access with RADIUS204
- Understanding RADIUS204
- RADIUS Operation205
- Configuring RADIUS206
- Displaying the RADIUS Configuration217
Controlling Switch Access with Kerberos218
- Understanding Kerberos218
- Kerberos Operation220
- Configuring Kerberos222
Configuring the Switch for Local Authentication and Authorization222
Configuring the Switch for Secure Shell223
- Understanding SSH224
  - SSH Servers, Integrated Clients, and Supported Versions224
  - Limitations225
- Configuring SSH225
- Displaying the SSH Configuration and Status227
CHAPTER 10 Configuring 802.1X Port-Based Authentication230
- Understanding 802.1X Port-Based Authentication230
- Configuring 802.1X Authentication238
- Configuring the Switch-To-RADIUS-Server Communication243
- Configuring Periodic Re-Authentication244
- Manually Re-Authenticating a Client Connected to a Port244
- Changing the Quiet Period245
- Changing the Switch-To-Client Retransmission Time245
  - Setting the Re-Authentication Number246
- Setting the Switch-To-Client Frame-Retransmission Number246
- Configuring the Host Mode247
- Configuring a Guest VLAN248
- Resetting the 802.1X Configuration to the Default Values249
  - Displaying 802.1X Statistics and Status250
- Configuring 802.1X Accounting249
CHAPTER 11 Configuring Interface Characteristics251
- Understanding Interface Types251
- Using Interface Configuration Mode257
- Configuring Ethernet Interfaces262
  - Default Ethernet Interface Configuration262
- Configuration Guidelines for 10-Gigabit Ethernet Interfaces264
- Configuring Interface Speed and Duplex Mode264
  - Configuration Guidelines265
  - Setting the Interface Speed and Duplex Parameters265
- Configuring IEEE 802.3Z Flow Control267
- Configuring Auto-MDIX on an Interface268
- Configuring Power over Ethernet on an Interface269
- Adding a Description for an Interface270
Configuring Smartports Macros277
- Understanding Smartports Macros277
- Configuring Smartports Macros278
- Displaying Smartports Macros284
Configuring Vlans285
- Understanding Vlans285
Chapter 13 Configuring VLAN287
- Supported Vlans287
- VLAN Port Membership Modes287
- Configuring Normal-Range Vlans289
- Token Ring Vlans290
- Normal-Range VLAN Configuration Guidelines290
- VLAN Configuration Mode Options291
  - VLAN Configuration in Config-Vlan Mode291
  - VLAN Configuration in VLAN Database Configuration Mode291
- Saving VLAN Configuration292
- Default Ethernet VLAN Configuration292
- Creating or Modifying an Ethernet VLAN293
- Deleting a VLAN295
- Assigning Static-Access Ports to a VLAN295
Chapter 14 Configuring VTP320
- The VTP Domain320
- VTP Modes321
- VTP Advertisements321
- VTP Version 2322
- VTP Pruning323
- VTP and Switch Stacks324
- Configuring VTP324
- Monitoring VTP334
Configuring Private Vlans335
- Understanding Private Vlans335
Chapter 15 Configuring Private VLAN336
- IP Addressing Scheme with Private Vlans337
- Private Vlans Across Multiple Switches338
- Private-VLAN Interaction with Other Features338
- Configuring Private Vlans339
- Tasks for Configuring Private Vlans340
- Default Private-VLAN Configuration341
- Private-VLAN Configuration Guidelines341
- Configuring and Associating Vlans in a Private VLAN344
- Configuring a Layer 2 Interface as a Private-VLAN Host Port345
  - Configuration File346
- Configuring a Layer 2 Interface as a Private-VLAN Promiscuous Port347
Step 1348
- Monitoring Private Vlans349
- Configuring Voice VLAN351
- Understanding Voice VLAN351
- Mapping Secondary Vlans to a Primary VLAN Layer 3 VLAN Interface348
Chapter 16 Configuring Voice VLAN352
- Cisco IP Phone Voice Traffic352
- Cisco IP Phone Data Traffic352
- Configuring Voice VLAN353
- Displaying Voice VLAN356
- Configuring STP357
- Understanding Spanning-Tree Features357
Chapter 17 Configuring STP358
- STP Overview358
- Spanning-Tree Topology and Bpdus359
- Bridge ID, Switch Priority, and Extended System ID360
- Spanning-Tree Interface States361
- Configuring Spanning-Tree Features368
- Displaying the Spanning-Tree Status380
- Configuring MSTP381
Chapter 18 Configuring MSTP382
- Understanding MSTP382
- Understanding RSTP386
- Configuring MSTP Features392
- Default MSTP Configuration393
- MSTP Configuration Guidelines393
- Specifying the MST Region Configuration and Enabling MSTP394
- Configuring the Root Switch395
- Configuring a Secondary Root Switch397
- Configuring Port Priority398
  - Configuring Path Cost399
- Configuring the Switch Priority400
- Configuring the Hello Time400
- Configuring the Forwarding-Delay Time401
- Configuring the Maximum-Aging Time402
- Configuring the Maximum-Hop Count402
- Specifying the Link Type to Ensure Rapid Transitions403
  - Displaying the MST Configuration and Status404
- Restarting the Protocol Migration Process403
CHAPTER 19 Configuring Optional Spanning-Tree Features405
- Understanding Optional Spanning-Tree Features405
Understanding Optional Spanning-Tree Features406
- Understanding Port Fast406
- Understanding BPDU Guard407
- Understanding BPDU Filtering407
- Understanding Uplinkfast408
- Understanding Cross-Stack Uplinkfast409
  - How CSUF Works410
  - Events that Cause Fast Convergence411
- Understanding Backbonefast411
- Understanding Etherchannel Guard414
- Understanding Root Guard414
  - Configuring Optional Spanning-Tree Features415
- Understanding Loop Guard415
  - Displaying the Spanning-Tree Status423
Configuring Flex Links425
- Understanding Flex Links425
- Configuring Flex Links426
  - Default Flex Link Configuration426
  - Flex Link Configuration Guidelines426
Chapter 20 Configuring Flex Link426
- Configuring Flex Links427
- Monitoring Flex Links427
- Configuring Flex Links428
CHAPTER 21 Configuring DHCP Features and IP Source Guard429
- Understanding DHCP Features429
- Configuring DHCP Features435
- Displaying DHCP Snooping Information442
  - Displaying the DHCP Snooping Configuration442
  - Displaying the DHCP Snooping Binding Database442
- Understanding IP Source Guard443
  - Source IP Address Filtering444
  - Source IP and MAC Address Filtering444
- Configuring IP Source Guard444
- Displaying IP Source Guard Information447
Configuring Dynamic ARP Inspection449
- Understanding Dynamic ARP Inspection449
- Configuring Dynamic ARP Inspection453
- Displaying Dynamic ARP Inspection Information462
- Understanding IGMP Snooping465
Chapter 23 Configuring IGMP Snooping and MVR466
- IGMP Versions466
- Joining a Multicast Group467
- Leaving a Multicast Group469
- Immediate Leave469
- IGMP Report Suppression469
- IGMP Snooping and Switch Stacks470
- Configuring IGMP Snooping470
- Displaying IGMP Snooping Information476
- Understanding Multicast VLAN Registration477
  - Using MVR in a Multicast Television Application477
- Configuring MVR479
- Displaying MVR Information483
- Configuring IGMP Filtering and Throttling483
- Displaying IGMP Filtering and Throttling Configuration489
CHAPTER 24 Configuring Port-Based Traffic Control491
- Configuring Storm Control491
- Configuring Protected Ports495
- Configuring Port Blocking496
  - Default Port Blocking Configuration496
  - Blocking Flooded Traffic on an Interface496
- Configuring Port Security497
- Displaying Port-Based Traffic Control Settings505
Configuring CDP507
- Understanding CDP507
  - CDP and Switch Stacks508
- Configuring CDP508
  - Default CDP Configuration508
  - Configuring the CDP Characteristics508
Chapter 25 Configuring CDP509
- Disabling and Enabling CDP509
- Disabling and Enabling CDP on an Interface510
- Monitoring and Maintaining CDP511
- Configuring UDLD513
- Understanding UDLD513
  - Modes of Operation513
Chapter 26 Configuring UDLD514
- Default UDLD Configuration516
- Configuration Guidelines516
- Enabling UDLD Globally517
- Enabling UDLD on an Interface518
- Resetting an Interface Disabled by UDLD518
- Displaying UDLD Status519
- Configuring SPAN and RSPAN521
- Understanding SPAN and RSPAN521
Chapter 27 Configuring SPAN and RSPAN522
- Local SPAN522
- Remote SPAN523
- SPAN and RSPAN Concepts and Terminology524
- SPAN and RSPAN Interaction with Other Features529
- SPAN and RSPAN and Switch Stacks530
- Configuring SPAN and RSPAN530
- Displaying SPAN and RSPAN Status544
Configuring RMON545
- Understanding RMON545
- Configuring RMON546
- Displaying RMON Status550
Configuring System Message Logging551
- Understanding System Message Logging551
- Configuring System Message Logging552
- Configuring SNMP565
  - Understanding SNMP565
Chapter 30 Configuring SNMP566
- SNMP Versions566
- SNMP Manager Functions567
- SNMP Agent Functions568
- SNMP Community Strings568
- Using SNMP to Access MIB Variables569
- SNMP Notifications569
- SNMP Ifindex MIB Object Values570
- Configuring SNMP570
- Displaying SNMP Status581
Configuring Network Security with Acls583
- Understanding Acls583
- Acls and Switch Stacks588
- Configuring IP Acls588
- Creating Named MAC Extended Acls609
  - Applying a MAC ACL to a Layer 2 Interface611
- Configuring VLAN Maps612
- Using VLAN Maps with Router Acls619
  - Guidelines619
  - Examples of Router Acls and VLAN Maps Applied to Vlans620
- Displaying ACL Configuration622
Configuring Qos625
- Understanding Qos625
Chapter 32 Configuring Qo627
- Basic Qos Model627
- Classification628
  - Classification Based on Qos Acls631
  - Classification Based on Class Maps and Policy Maps631
- Policing and Marking632
- Mapping Tables634
- Queueing and Scheduling Overview635
- Packet Modification641
- Configuring Auto-Qos642
- Displaying Auto-Qos Information652
- Configuring Standard Qos652
- Displaying Standard Qos Information691
Configuring Etherchannels693
- Understanding Etherchannels693
- Configuring Etherchannels702
Configuring IP Unicast Routing717
- Understanding IP Routing718
  - Types of Routing718
Chapter 34 Configuring IP Unicast Routing719
- IP Routing and Switch Stacks719
- Steps for Configuring Routing720
- Configuring IP Addressing721
- Enabling IP Unicast Routing735
- Configuring RIP736
- Configuring OSPF741
- Configuring EIGRP750
- Configuring BGP756
- Configuring Protocol-Independent Features776
- Monitoring and Maintaining the IP Network790
- Configuring HSRP791
- Understanding HSRP791
Chapter 35 Configuring HSRP792
- HSRP and Switch Stacks792
- Configuring HSRP793
- Displaying HSRP Configurations801
Configuring IP Multicast Routing803
- C H a P T E R 36 Configuring IP Multicast Routing804
- Understanding Cisco's Implementation of IP Multicast Routing804
- Multicast Routing and Switch Stacks810
- Configuring IP Multicast Routing810
- Configuring Advanced PIM Features825
- Configuring Optional IGMP Features829
- Configuring Optional Multicast Routing Features834
- Configuring Basic DVMRP Interoperability Features839
- Configuring Advanced DVMRP Interoperability Features844
- Monitoring and Maintaining IP Multicast Routing852
- Configuring MSDP855
- Understanding MSDP855
Chapter 37 Configuring MSDP856
- MSDP Operation856
- MSDP Benefits857
- Configuring MSDP858
- Monitoring and Maintaining MSDP873
Configuring Fallback Bridging875
- Understanding Fallback Bridging875
  - Fallback Bridging Overview875
  - Fallback Bridging and Switch Stacks877
- Configuring Fallback Bridging877
- Monitoring and Maintaining Fallback Bridging885
- Troubleshooting887
Chapter 39 Troubleshooting888
- Recovering from Corrupted Software by Using the Xmodem Protocol888
- Recovering from a Lost or Forgotten Password890
  - Procedure with Password Recovery Enabled891
  - Procedure with Password Recovery Disabled892
- Preventing Switch Stack Problems894
- Recovering from a Command Switch Failure895
  - Replacing a Failed Command Switch with a Cluster Member895
  - Replacing a Failed Command Switch with Another Switch897
- Recovering from Lost Cluster Member Connectivity898
- Preventing Autonegotiation Mismatches899
- Troubleshooting Power over Ethernet Switch Ports899
- SFP Module Security and Identification899
- Monitoring SFP Module Status900
- Using Ping900
  - Understanding Ping900
  - Executing Ping901
- Using Layer 2 Traceroute902
- Using IP Traceroute903
  - Understanding IP Traceroute903
  - Executing IP Traceroute904
Using TDR905
- Understanding TDR905
- Running TDR and Displaying the Results906
- Using Debug Commands907
Appendix913
Supported Mibs913
- MIB List913
Appendix A Supported MIB914
- MIB List914
- Using FTP to Access the MIB Files915
Appendix917
Working with the Cisco IOS File System, Configuration Files, and Software Images917
- Working with the Flash File System917
- Working with Configuration Files924
- Working with Software Images936
Appendix951
Unsupported Commands in Cisco IOS Release 12.2(20)SE951
- Access Control Lists951
- ARP Commands952
  - Unsupported Global Configuration Commands952
  - Unsupported Interface Configuration Commands952
- Fallback Bridging952
  - Unsupported Privileged EXEC Commands952
  - Unsupported Interface Configuration Commands953
- Hsrp954
Msdp959
- Unsupported Global Configuration Commands960
- Network Address Translation (NAT) Commands960
  - Unsupported User EXEC Commands960
  - Unsupported Interface Configuration Commands960
Radius960
Snmp961
- Unsupported Global Configuration Commands961
- Spanning Tree961
  - Unsupported Global Configuration Command961
  - Unsupported Interface Configuration Command961
Vlan961
- Unsupported User EXEC Commands961
Vtp961
- Unsupported Privileged EXEC Commands961
I N D E X963

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Brand	Cisco
Model	WS-C3750-48PS-S
Category	Switch
Language	English