Cisco Systems 2950 User manual

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Catalyst 2950 Desktop Switch Software

Configuration Guide

Cisco IOS Release 12.1(11)EA1

August 2002

Customer Order Number: DOC-7811380=

Text Part Number: 78-11380-05

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Catalyst 2950 Desktop Switch Software Configuration Guide

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CONTENTS

Preface xxiii

Audience xxiii

Purpose xxiii

Organization xxiv

Conventions xxvi

Related Publications xxvii

Obtaining Documentation xxvii

World Wide Web xxvii

Documentation CD-ROM xxviii

Ordering Documentation xxviii

Documentation Feedback xxviii

Obtaining Technical Assistance xxviii

Cisco.com xxix

Technical Assistance Center xxix

Cisco TAC Website xxix

Cisco TAC Escalation Center xxx

CHAPTER

1 Overview 1-1

Features 1-1

Management Options 1-5

Management Interface Options 1-6

Advantages of Using CMS and Clustering Switches 1-6

Network Configuration Examples 1-7

Design Concepts for Using the Switch 1-7

Small to Medium-Sized Network Configuration 1-10

Collapsed Backbone and Switch Cluster Configuration 1-12

Large Campus Configuration 1-13

Multidwelling Network Using Catalyst 2950 Switches 1-14

Long-Distance, High-Bandwidth Transport Configuration 1-16

Where to Go Next 1-17

Contents

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CHAPTER

2 Using the Command-Line Interface 2-1

IOS Command Modes 2-1

Getting Help 2-3

Abbreviating Commands 2-3

Using no and default Forms of Commands 2-4

Understanding CLI Messages 2-4

Using Command History 2-5

Changing the Command History Buffer Size 2-5

Recalling Commands 2-5

Disabling the Command History Feature 2-6

Using Editing Features 2-6

Enabling and Disabling Editing Features 2-6

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 from a Browser 2-10

CHAPTER

3 Getting Started with CMS 3-1

Features 3-2

Front Panel View 3-4

Cluster Tree 3-5

Front-Panel Images 3-5

Redundant Power System LED 3-6

Port Modes and LEDs 3-7

VLAN Membership Modes 3-8

Topology View 3-9

Topology Icons 3-11

Device and Link Labels 3-12

Colors in the Topology View 3-12

Topology Display Options 3-13

Menus and Toolbar 3-14

Menu Bar 3-14

Toolbar 3-19

Front Panel View Popup Menus 3-20

Device Popup Menu 3-20

Port Popup Menu 3-20

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Topology View Popup Menus 3-21

Link Popup Menu 3-21

Device Popup Menus 3-22

Interaction Modes 3-23

Guide Mode 3-24

Expert Mode 3-24

Wizards 3-24

Tool Tips 3-25

Online Help 3-25

CMS Window Components 3-26

Host Name List 3-26

Tabs, Lists, and Tables 3-27

Icons Used in Windows 3-27

Buttons 3-27

Accessing CMS 3-28

Access Modes in CMS 3-29

HTTP Access to CMS 3-29

Verifying Your Changes 3-30

Change Notification 3-30

Error Checking 3-30

Saving Your Configuration 3-30

Restoring Your Configuration 3-31

CMS Preferences 3-31

Using Different Versions of CMS 3-31

Where to Go Next 3-32

CHAPTER

4 Assigning the Switch IP Address and Default Gateway 4-1

Understanding the Boot Process 4-1

Assigning Switch Information 4-2

Default Switch Information 4-3

Understanding DHCP-Based Autoconfiguration 4-3

DHCP Client Request Process 4-4

Configuring the DHCP Server 4-5

Configuring the TFTP Server 4-5

Configuring the DNS 4-6

Configuring the Relay Device 4-6

Obtaining Configuration Files 4-7

Example Configuration 4-8

Contents

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Manually Assigning IP Information 4-10

Checking and Saving the Running Configuration 4-10

CHAPTER

5 Configuring IE2100 CNS Agents 5-1

Understanding IE2100 Series Configuration Registrar Software 5-1

CNS Configuration Service 5-2

CNS Event Service 5-3

NameSpace Mapper 5-3

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

ConfigID 5-3

DeviceID 5-4

Host Name and DeviceID 5-4

Using Host Name, DeviceID, and ConfigID 5-4

Understanding CNS Embedded Agents 5-5

Initial Configuration 5-5

Incremental (Partial) Configuration 5-6

Synchronized Configuration 5-6

Configuring CNS Embedded Agents 5-6

Enabling Automated CNS Configuration 5-6

Enabling the CNS Event Agent 5-8

Enabling the CNS Configuration Agent 5-9

Enabling an Initial Configuration 5-9

Enabling a Partial Configuration 5-12

Displaying CNS Configuration 5-12

CHAPTER

6 Clustering Switches 6-1

Understanding Switch Clusters 6-2

Command Switch Characteristics 6-3

Standby Command Switch Characteristics 6-3

Candidate Switch and Member Switch Characteristics 6-4

Planning a Switch Cluster 6-5

Automatic Discovery of Cluster Candidates and Members 6-5

Discovery through CDP Hops 6-6

Discovery through Non-CDP-Capable and Noncluster-Capable Devices 6-8

Discovery through the Same Management VLAN 6-9

Discovery through Different Management VLANs 6-10

Discovery of Newly Installed Switches 6-11

Contents

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HSRP and Standby Command Switches 6-13

Virtual IP Addresses 6-14

Other Considerations for Cluster Standby Groups 6-14

Automatic Recovery of Cluster Configuration 6-16

IP Addresses 6-16

Host Names 6-17

Passwords 6-17

SNMP Community Strings 6-17

TACACS+ and RADIUS 6-18

Access Modes in CMS 6-18

Management VLAN 6-19

LRE Profiles 6-19

Availability of Switch-Specific Features in Switch Clusters 6-20

Creating a Switch Cluster 6-20

Enabling a Command Switch 6-20

Adding Member Switches 6-21

Creating a Cluster Standby Group 6-23

Verifying a Switch Cluster 6-25

Using the CLI to Manage Switch Clusters 6-26

Catalyst 1900 and Catalyst 2820 CLI Considerations 6-26

Using SNMP to Manage Switch Clusters 6-27

CHAPTER

7 Administering the Switch 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 7-4

Setting a Telnet Password for a Terminal Line 7-5

Configuring Username and Password Pairs 7-6

Configuring Multiple Privilege Levels 7-7

Setting the Privilege Level for a Command 7-7

Changing the Default Privilege Level for Lines 7-8

Logging into and Exiting a Privilege Level 7-9

Controlling Switch Access with TACACS+ 7-9

Understanding TACACS+ 7-9

TACACS+ Operation 7-11

Contents

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Configuring TACACS+ 7-11

Default TACACS+ Configuration 7-12

Identifying the TACACS+ Server Host and Setting the Authentication Key 7-12

Configuring TACACS+ Login Authentication 7-13

Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services 7-15

Starting TACACS+ Accounting 7-16

Displaying the TACACS+ Configuration 7-16

Controlling Switch Access with RADIUS 7-17

Understanding RADIUS 7-17

RADIUS Operation 7-18

Configuring RADIUS 7-19

Default RADIUS Configuration 7-19

Identifying the RADIUS Server Host 7-19

Configuring RADIUS Login Authentication 7-22

Defining AAA Server Groups 7-24

Configuring RADIUS Authorization for User Privileged Access and Network Services 7-26

Starting RADIUS Accounting 7-27

Configuring Settings for All RADIUS Servers 7-28

Configuring the Switch to Use Vendor-Specific RADIUS Attributes 7-28

Configuring the Switch for Vendor-Proprietary RADIUS Server Communication 7-29

Displaying the RADIUS Configuration 7-30

Configuring the Switch for Local Authentication and Authorization 7-31

Managing the System Time and Date 7-32

Understanding the System Clock 7-32

Understanding Network Time Protocol 7-32

Configuring NTP 7-34

Default NTP Configuration 7-35

Configuring NTP Authentication 7-35

Configuring NTP Associations 7-36

Configuring NTP Broadcast Service 7-37

Configuring NTP Access Restrictions 7-38

Configuring the Source IP Address for NTP Packets 7-40

Displaying the NTP Configuration 7-41

Configuring Time and Date Manually 7-41

Setting the System Clock 7-42

Displaying the Time and Date Configuration 7-42

Configuring the Time Zone 7-43

Configuring Summer Time (Daylight Saving Time) 7-44

Contents

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Configuring a System Name and Prompt 7-46

Default System Name and Prompt Configuration 7-46

Configuring a System Name 7-46

Configuring a System Prompt 7-47

Understanding DNS 7-47

Default DNS Configuration 7-48

Setting Up DNS 7-48

Displaying the DNS Configuration 7-49

Creating a Banner 7-49

Default Banner Configuration 7-49

Configuring a Message-of-the-Day Login Banner 7-50

Configuring a Login Banner 7-51

Managing the MAC Address Table 7-52

Building the Address Table 7-52

MAC Addresses and VLANs 7-53

Default MAC Address Table Configuration 7-53

Changing the Address Aging Time 7-53

Removing Dynamic Address Entries 7-54

Configuring MAC Address Notification Traps 7-54

Adding and Removing Static Address Entries 7-56

Adding and Removing Secure Addresses 7-57

Displaying Address Table Entries 7-58

Managing the ARP Table 7-59

CHAPTER

8 Configuring 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

Configuring 802.1X Authentication 8-5

Default 802.1X Configuration 8-6

802.1X Configuration Guidelines 8-7

Enabling 802.1X Authentication 8-8

Configuring the Switch-to-RADIUS-Server Communication 8-9

Enabling Periodic Re-Authentication 8-10

Manually Re-Authenticating a Client Connected to a Port 8-11

Changing the Quiet Period 8-11

Changing the Switch-to-Client Retransmission Time 8-12

Contents

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Setting the Switch-to-Client Frame-Retransmission Number 8-13

Enabling Multiple Hosts 8-13

Resetting the 802.1X Configuration to the Default Values 8-14

Displaying 802.1X Statistics and Status 8-14

CHAPTER

9 Configuring Interface Characteristics 9-1

Understanding Interface Types 9-1

Port-Based VLANs 9-1

Switch Ports 9-2

Access Ports 9-2

Trunk Ports 9-3

EtherChannel Port Groups 9-3

Connecting Interfaces 9-3

Using the Interface Command 9-4

Procedures for Configuring Interfaces 9-5

Configuring a Range of Interfaces 9-6

Configuring and Using Interface Range Macros 9-8

Configuring Layer 2 Interfaces 9-9

Default Layer 2 Ethernet Interface Configuration 9-9

Configuring Interface Speed and Duplex Mode 9-10

Configuration Guidelines 9-11

Setting the Interface Speed and Duplex Parameters 9-11

Configuring IEEE 802.3X Flow Control on Gigabit Ethernet Ports 9-12

Adding a Description for an Interface 9-13

Monitoring and Maintaining the Interfaces 9-14

Monitoring Interface and Controller Status 9-14

Clearing and Resetting Interfaces and Counters 9-16

Shutting Down and Restarting the Interface 9-17

CHAPTER

10 Configuring STP 10-1

Understanding Spanning-Tree Features 10-1

STP Overview 10-2

Supported Spanning-Tree Instances 10-2

Bridge Protocol Data Units 10-2

Election of the Root Switch 10-3

Bridge ID, Switch Priority, and Extended System ID 10-4

Spanning-Tree Timers 10-4

Creating the Spanning-Tree Topology 10-5

Contents

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Spanning-Tree Interface States 10-5

Blocking State 10-7

Listening State 10-7

Learning State 10-7

Forwarding State 10-7

Disabled State 10-8

Spanning-Tree Address Management 10-8

STP and IEEE 802.1Q Trunks 10-8

Spanning Tree and Redundant Connectivity 10-8

Accelerated Aging to Retain Connectivity 10-9

Configuring Spanning-Tree Features 10-9

Default STP Configuration 10-10

STP Configuration Guidelines 10-10

Disabling STP 10-12

Configuring the Root Switch 10-12

Configuring a Secondary Root Switch 10-14

Configuring the Port Priority 10-15

Configuring the Path Cost 10-16

Configuring the Switch Priority of a VLAN 10-18

Configuring the Hello Time 10-19

Configuring the Forwarding-Delay Time for a VLAN 10-19

Configuring the Maximum-Aging Time for a VLAN 10-20

Configuring STP for Use in a Cascaded Stack 10-20

Displaying the Spanning-Tree Status 10-21

CHAPTER

11 Configuring RSTP and MSTP 11-1

Understanding RSTP 11-2

Port Roles and the Active Topology 11-2

Rapid Convergence 11-3

Synchronization of Port Roles 11-4

Bridge Protocol Data Unit Format and Processing 11-5

Processing Superior BPDU Information 11-6

Processing Inferior BPDU Information 11-6

Topology Changes 11-6

Understanding MSTP 11-7

Multiple Spanning-Tree Regions 11-7

IST, CIST, and CST 11-8

Operations Within an MST Region 11-8

Operations Between MST Regions 11-9

Contents

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Hop Count 11-10

Boundary Ports 11-10

Interoperability with 802.1D STP 11-11

Configuring RSTP and MSTP Features 11-11

Default RSTP and MSTP Configuration 11-12

RSTP and MSTP Configuration Guidelines 11-12

Specifying the MST Region Configuration and Enabling MSTP 11-13

Configuring the Root Switch 11-14

Configuring a Secondary Root Switch 11-16

Configuring the Port Priority 11-17

Configuring the Path Cost 11-18

Configuring the Switch Priority 11-19

Configuring the Hello Time 11-19

Configuring the Forwarding-Delay Time 11-20

Configuring the Maximum-Aging Time 11-21

Configuring the Maximum-Hop Count 11-21

Specifying the Link Type to Ensure Rapid Transitions 11-22

Restarting the Protocol Migration Process 11-22

Displaying the MST Configuration and Status 11-23

CHAPTER

12 Configuring Optional Spanning-Tree Features 12-1

Understanding Optional Spanning-Tree Features 12-1

Understanding Port Fast 12-2

Understanding BPDU Guard 12-3

Understanding BPDU Filtering 12-3

Understanding UplinkFast 12-4

Understanding Cross-Stack UplinkFast 12-5

How CSUF Works 12-6

Events That Cause Fast Convergence 12-7

Limitations 12-8

Connecting the Stack Ports 12-8

Understanding BackboneFast 12-10

Understanding Root Guard 12-12

Understanding Loop Guard 12-13

Configuring Optional Spanning-Tree Features 12-13

Default Optional Spanning-Tree Configuration 12-14

Enabling Port Fast 12-14

Enabling BPDU Guard 12-15

Enabling BPDU Filtering 12-16

Contents

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Enabling UplinkFast for Use with Redundant Links 12-17

Enabling Cross-Stack UplinkFast 12-18

Enabling BackboneFast 12-19

Enabling Root Guard 12-19

Enabling Loop Guard 12-20

Displaying the Spanning-Tree Status 12-21

CHAPTER

13 Configuring VLANs 13-1

Understanding VLANs 13-1

Supported VLANs 13-2

VLAN Port Membership Modes 13-3

Configuring Normal-Range VLANs 13-4

Token Ring VLANs 13-5

Normal-Range VLAN Configuration Guidelines 13-5

VLAN Configuration Mode Options 13-6

VLAN Configuration in config-vlan Mode 13-6

VLAN Configuration in VLAN Configuration Mode 13-6

Saving VLAN Configuration 13-7

Default Ethernet VLAN Configuration 13-8

Creating or Modifying an Ethernet VLAN 13-8

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 13-12

Creating an Extended-Range VLAN 13-13

Displaying VLANs 13-14

Configuring VLAN Trunks 13-15

Trunking Overview 13-15

802.1Q Configuration Considerations 13-16

Default Layer 2 Ethernet Interface VLAN Configuration 13-17

Configuring an Ethernet Interface as a Trunk Port 13-17

Interaction with Other Features 13-17

Configuring a Trunk Port 13-18

Defining the Allowed VLANs on a Trunk 13-19

Changing the Pruning-Eligible List 13-20

Configuring the Native VLAN for Untagged Traffic 13-20

Contents

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Load Sharing Using STP 13-21

Load Sharing Using STP Port Priorities 13-21

Load Sharing Using STP Path Cost 13-23

Configuring VMPS 13-24

Understanding VMPS 13-25

Dynamic Port VLAN Membership 13-25

VMPS Database Configuration File 13-26

Default VMPS Configuration 13-27

VMPS Configuration Guidelines 13-28

Configuring the VMPS Client 13-28

Entering the IP Address of the VMPS 13-28

Configuring Dynamic Access Ports on VMPS Clients 13-29

Reconfirming VLAN Memberships 13-30

Changing the Reconfirmation Interval 13-30

Changing the Retry Count 13-30

Monitoring the VMPS 13-31

Troubleshooting Dynamic Port VLAN Membership 13-31

VMPS Configuration Example 13-32

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

Configuring VTP 14-6

Default VTP Configuration 14-6

VTP Configuration Options 14-7

VTP Configuration in Global Configuration Modes 14-7

VTP Configuration in VLAN Configuration Mode 14-7

VTP Configuration Guidelines 14-8

Domain Names 14-8

Passwords 14-8

Upgrading from Previous Software Releases 14-8

VTP Version 14-9

Configuration Requirements 14-9

Configuring a VTP Server 14-9

Configuring a VTP Client 14-11

Contents

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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 14-15

Monitoring VTP 14-16

CHAPTER

15 Configuring Voice VLAN 15-1

Understanding Voice VLAN 15-1

Configuring Voice VLAN 15-2

Default Voice VLAN Configuration 15-2

Voice VLAN Configuration Guidelines 15-3

Configuring a Port to Connect to a Cisco 7960 IP Phone 15-3

Configuring Ports to Carry Voice Traffic in 802.1Q Frames 15-4

Configuring Ports to Carry Voice Traffic in 802.1P Priority Tagged Frames 15-4

Overriding the CoS Priority of Incoming Data Frames 15-5

Configuring the IP Phone to Trust the CoS Priority of Incoming Data Frames 15-6

Displaying Voice VLAN 15-6

CHAPTER

16 Configuring IGMP Snooping and MVR 16-1

Understanding IGMP Snooping 16-1

Joining a Multicast Group 16-2

Leaving a Multicast Group 16-4

Immediate-Leave Processing 16-4

Configuring IGMP Snooping 16-5

Default IGMP Snooping Configuration 16-5

Enabling or Disabling IGMP Snooping 16-5

Setting the Snooping Method 16-6

Configuring a Multicast Router Port 16-7

Configuring a Host Statically to Join a Group 16-8

Enabling IGMP Immediate-Leave Processing 16-9

Displaying IGMP Snooping Information 16-9

Understanding Multicast VLAN Registration 16-12

Using MVR in a Multicast Television Application 16-12

Configuring MVR 16-14

Default MVR Configuration 16-14

MVR Configuration Guidelines and Limitations 16-15

Configuring MVR Global Parameters 16-15

Configuring MVR Interfaces 16-16

Contents

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Displaying MVR Information 16-18

Configuring IGMP Filtering 16-19

Default IGMP Filtering Configuration 16-19

Configuring IGMP Profiles 16-20

Applying IGMP Profiles 16-21

Setting the Maximum Number of IGMP Groups 16-22

Displaying IGMP Filtering Configuration 16-23

CHAPTER

17 Configuring Port-Based Traffic Control 17-1

Configuring Storm Control 17-1

Understanding Storm Control 17-1

Default Storm Control Configuration 17-2

Enabling Storm Control 17-2

Disabling Storm Control 17-3

Configuring Protected Ports 17-3

Configuring Port Security 17-4

Understanding Port Security 17-4

Secure MAC Addresses 17-5

Security Violations 17-6

Default Port Security Configuration 17-6

Port Security Configuration Guidelines 17-7

Enabling and Configuring Port Security 17-7

Enabling and Configuring Port Security Aging 17-10

Displaying Port-Based Traffic Control Settings 17-12

CHAPTER

18 Configuring UDLD 18-1

Understanding UDLD 18-1

Configuring UDLD 18-3

Default UDLD Configuration 18-3

Enabling UDLD Globally 18-4

Enabling UDLD on an Interface 18-4

Resetting an Interface Shut Down by UDLD 18-5

Displaying UDLD Status 18-6

Contents

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CHAPTER

19 Configuring CDP 19-1

Understanding CDP 19-1

Configuring CDP 19-2

Default CDP Configuration 19-2

Configuring the CDP Characteristics 19-2

Disabling and Enabling CDP 19-3

Disabling and Enabling CDP on an Interface 19-4

Monitoring and Maintaining CDP 19-5

CHAPTER

20 Configuring SPAN and RSPAN 20-1

Understanding SPAN and RSPAN 20-1

SPAN and RSPAN Concepts and Terminology 20-3

SPAN Session 20-3

Traffic Types 20-3

Source Port 20-4

Destination Port 20-4

Reflector Port 20-4

SPAN Traffic 20-5

SPAN and RSPAN Interaction with Other Features 20-5

SPAN and RSPAN Session Limits 20-6

Default SPAN and RSPAN Configuration 20-6

Configuring SPAN 20-7

SPAN Configuration Guidelines 20-7

Creating a SPAN Session and Specifying Ports to Monitor 20-7

Removing Ports from a SPAN Session 20-9

Configuring RSPAN 20-10

RSPAN Configuration Guidelines 20-10

Creating an RSPAN Session 20-11

Creating an RSPAN Destination Session 20-12

Removing Ports from an RSPAN Session 20-13

Displaying SPAN and RSPAN Status 20-14

Contents

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CHAPTER

21 Configuring RMON 21-1

Understanding RMON 21-1

Configuring RMON 21-2

Default RMON Configuration 21-3

Configuring RMON Alarms and Events 21-3

Configuring RMON Collection on an Interface 21-5

Displaying RMON Status 21-6

CHAPTER

22 Configuring System Message Logging 22-1

Understanding System Message Logging 22-1

Configuring System Message Logging 22-2

System Log Message Format 22-2

Default System Message Logging Configuration 22-3

Disabling and Enabling Message Logging 22-4

Setting the Message Display Destination Device 22-4

Synchronizing Log Messages 22-6

Enabling and Disabling Timestamps on Log Messages 22-7

Enabling and Disabling Sequence Numbers in Log Messages 22-8

Defining the Message Severity Level 22-8

Limiting Syslog Messages Sent to the History Table and to SNMP 22-10

Configuring UNIX Syslog Servers 22-10

Logging Messages to a UNIX Syslog Daemon 22-11

Configuring the UNIX System Logging Facility 22-11

Displaying the Logging Configuration 22-12

CHAPTER

23 Configuring SNMP 23-1

Understanding SNMP 23-1

SNMP Versions 23-2

SNMP Manager Functions 23-3

SNMP Agent Functions 23-3

SNMP Community Strings 23-4

Using SNMP to Access MIB Variables 23-4

SNMP Notifications 23-5

Configuring SNMP 23-5

Default SNMP Configuration 23-6

SNMP Configuration Guidelines 23-6

Disabling the SNMP Agent 23-7

Configuring Community Strings 23-7

Contents

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Configuring SNMP Groups and Users 23-8

Configuring SNMP Notifications 23-10

Setting the Agent Contact and Location Information 23-13

Limiting TFTP Servers Used Through SNMP 23-13

SNMP Examples 23-14

Displaying SNMP Status 23-15

CHAPTER

24 Configuring Network Security with ACLs 24-1

Understanding ACLs 24-2

Handling Fragmented and Unfragmented Traffic 24-3

Understanding Access Control Parameters 24-4

Guidelines for Applying ACLs to Physical Interfaces 24-6

Configuring ACLs 24-6

Unsupported Features 24-7

Creating Standard and Extended IP ACLs 24-7

ACL Numbers 24-8

Creating a Numbered Standard ACL 24-9

Creating a Numbered Extended ACL 24-10

Creating Named Standard and Extended ACLs 24-13

Applying Time Ranges to ACLs 24-15

Including Comments About Entries in ACLs 24-17

Creating Named MAC Extended ACLs 24-18

Creating MAC Access Groups 24-19

Applying ACLs to Terminal Lines or Physical Interfaces 24-20

Applying ACLs to a Terminal Line 24-20

Applying ACLs to a Physical Interface 24-21

Displaying ACL Information 24-21

Displaying ACLs 24-22

Displaying Access Groups 24-23

Examples for Compiling ACLs 24-23

Numbered ACL Examples 24-25

Extended ACL Examples 24-25

Named ACL Example 24-25

Commented IP ACL Entry Examples 24-25

Contents

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Catalyst 2950 Desktop Switch Software Configuration Guide

78-11380-05

CHAPTER

25 Configuring QoS 25-1

Understanding QoS 25-2

Basic QoS Model 25-3

Classification 25-4

Classification Based on QoS ACLs 25-5

Classification Based on Class Maps and Policy Maps 25-6

Policing and Marking 25-6

Mapping Tables 25-7

Queueing and Scheduling 25-7

How Class of Service Works 25-7

Port Priority 25-8

Port Scheduling 25-8

CoS and WRR 25-8

Configuring QoS 25-9

Default QoS Configuration 25-9

Configuration Guidelines 25-10

Configuring Classification Using Port Trust States 25-10

Configuring the Trust State on Ports within the QoS Domain 25-11

Configuring the CoS Value for an Interface 25-13

Configuring Trusted Boundary 25-13

Enabling Pass-Through Mode 25-15

Configuring a QoS Policy 25-16

Classifying Traffic by Using ACLs 25-16

Classifying Traffic by Using Class Maps 25-20

Classifying, Policing, and Marking Traffic by Using Policy Maps 25-21

Configuring CoS Maps 25-24

Configuring the CoS-to-DSCP Map 25-25

Configuring the DSCP-to-CoS Map 25-26

Configuring CoS and WRR 25-27

Configuring CoS Priority Queues 25-27

Configuring WRR 25-27

Displaying QoS Information 25-28

QoS Configuration Examples 25-29

QoS Configuration for the Existing Wiring Closet 25-30

QoS Configuration for the Intelligent Wiring Closet 25-30

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