Cisco Catalyst 2960 Series User manual

Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release
15.0(2)EX
First Published: July 10, 2013
Americas Headquarters
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
USA
http://www.cisco.com
Tel: [phone]
800 553-NETS (6387)
Fax: [phone]
Text Part Number: OL-29065

THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS,
INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS.
THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH
THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY,
CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.
The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB's public domain version
of the UNIX operating system. All rights reserved. Copyright ©1981, Regents of the University of California.
NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS" WITH ALL FAULTS.
CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE.
IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT
LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS
HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network
topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional
and coincidental.
Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: http://
www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership
relationship between Cisco and any other company. (1110R)
©2013 Cisco Systems, Inc. All rights reserved.

CONTENTS
Preface Preface ix
Document Conventions ix
Related Documentation xi
Obtaining Documentation and Submitting a Service Request xi
CHAPTER 1 Using the Command-Line Interface 1
Information About Using the Command-Line Interface 1
Command Modes 1
Using the Help System 3
Understanding Abbreviated Commands 4
No and default Forms of Commands 4
CLI Error Messages 4
Configuration Logging 5
How to Use the CLI to Configure Features 5
Configuring the Command History 5
Changing the Command History Buffer Size 6
Recalling Commands 6
Disabling the Command History Feature 7
Enabling and Disabling Editing Features 7
Editing Commands through Keystrokes 8
Editing Command Lines That Wrap 9
Searching and Filtering Output of show and more Commands 10
Accessing the CLI through a Console Connection or through Telnet 11
CHAPTER 2 Configuring VTP 13
Finding Feature Information 13
Prerequisites for VTP 13
Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX
OL-29065 iii

Restrictions for VTP 14
Information About VTP 14
VTP 14
VTP Domain 15
VTP Modes 16
VTP Advertisements 17
VTP Version 2 17
VTP Version 3 18
VTP Pruning 19
VTP and Switch Stacks 20
VTP Configuration Guidelines 21
VTP Configuration Requirements 21
VTP Settings 21
Domain Names for Configuring VTP 22
Passwords for the VTP Domain 22
VTP Version 22
Default VTP Configuration 24
How to Configure VTP 25
Configuring VTP Mode 25
Configuring a VTP Version 3 Password 27
Configuring a VTP Version 3 Primary Server 28
Enabling the VTP Version 29
Enabling VTP Pruning 30
Configuring VTP on a Per-Port Basis 31
Adding a VTP Client Switch to a VTP Domain 33
Monitoring VTP 35
Configuration Examples for VTP 36
Example: Configuring a Switch as the Primary Server 36
Example: Configuring Switch as VTP Server 36
Example: Enabling VTP on the Interface 36
Example: Creating the VTP Password 37
Where to Go Next 37
Additional References 37
Feature History and Information for VTP 38
Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX
iv OL-29065
Contents

CHAPTER 3 Configuring VLANs 39
Finding Feature Information 39
Prerequisites for VLANs 39
Restrictions for VLANs 40
Information About VLANs 40
Logical Networks 40
Supported VLANs 41
VLAN Port Membership Modes 42
VLAN Configuration Files 43
Normal-Range VLAN Configuration Guidelines 44
Extended-Range VLAN Configuration Guidelines 45
Default VLAN Configurations 45
Default Ethernet VLAN Configuration 45
Default VLAN Configuration 46
How to Configure VLANs 47
How to Configure Normal-Range VLANs 47
Creating or Modifying an Ethernet VLAN 47
Deleting a VLAN 49
Assigning Static-Access Ports to a VLAN 50
How to Configure Extended-Range VLANs 51
Creating an Extended-Range VLAN 52
Monitoring VLANs 54
Configuration Examples 55
Example: Creating a VLAN Name 55
Example: Configuring a Port as Access Port 56
Example: Creating an Extended-Range VLAN 56
Where to Go Next 56
Additional References 57
Feature History and Information for VLAN 58
CHAPTER 4 Configuring VLAN Trunks 59
Finding Feature Information 59
Prerequisites for VLAN Trunks 59
Information About VLAN Trunks 60
Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX
OL-29065 v
Contents

Trunking Overview 60
Trunking Modes 60
Layer 2 Interface Modes 60
Allowed VLANs on a Trunk 61
Load Sharing on Trunk Ports 62
Network Load Sharing Using STP Priorities 62
Network Load Sharing Using STP Path Cost 63
Feature Interactions 63
Default Layer 2 Ethernet Interface VLAN Configuration 64
How to Configure VLAN Trunks 64
Configuring an Ethernet Interface as a Trunk Port 65
Configuring a Trunk Port 65
Defining the Allowed VLANs on a Trunk 67
Changing the Pruning-Eligible List 68
Configuring the Native VLAN for Untagged Traffic 70
Configuring Trunk Ports for Load Sharing 71
Configuring Load Sharing Using STP Port Priorities 71
Configuring Load Sharing Using STP Path Cost 75
Configuration Examples for VLAN Trunking 78
Example: Configuring a Trunk Port 78
Example: Removing a VLAN from a Port 79
Where to Go Next 79
Additional References 79
Feature History and Information for VLAN Trunks 80
CHAPTER 5 Configuring VMPS 81
Finding Feature Information 81
Prerequisites for VMPS 81
Restrictions for VMPS 82
Information About VMPS 82
Dynamic VLAN Assignments 82
Dynamic-Access Port VLAN Membership 83
Default VMPS Client Configuration 84
How to Configure VMPS 84
Entering the IP Address of the VMPS 84
Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX
vi OL-29065
Contents

Configuring Dynamic-Access Ports on VMPS Clients 85
Reconfirming VLAN Memberships 87
Changing the Reconfirmation Interval 88
Changing the Retry Count 89
Troubleshooting Dynamic-Access Port VLAN Membership 90
Monitoring the VMPS 91
Configuration Example for VMPS 91
Example: VMPS Configuration 91
Where to Go Next 92
Additional References 93
Feature History and Information for VMPS 94
CHAPTER 6 Configuring Voice VLANs 95
Finding Feature Information 95
Prerequisites for Voice VLANs 95
Restrictions for Voice VLANs 96
Information About Voice VLAN 96
Voice VLANs 96
Cisco IP Phone Voice Traffic 97
Cisco IP Phone Data Traffic 97
Voice VLAN Configuration Guidelines 98
Default Voice VLAN Configuration 99
How to Configure Voice VLAN 99
Configuring Cisco IP Phone Voice Traffic 99
Configuring the Priority of Incoming Data Frames 101
Monitoring Voice VLAN 103
Configuration Examples 103
Example: Configuring Cisco IP Phone Voice Traffic 103
Example: Configuring the Priority of Incoming Data Frames 103
Where to Go Next 104
Additional References 104
Feature History and Information for Voice VLAN 105
Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX
OL-29065 vii
Contents

Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX
viii OL-29065
Contents

Preface
This guide describes configuration information and examples for VLANs on the switch.
•Document Conventions, page ix
•Related Documentation, page xi
•Obtaining Documentation and Submitting a Service Request, page xi
Document Conventions
This document uses the following conventions:
DescriptionConvention
Both the ^symbol and Ctrl represent the Control (Ctrl) key on a keyboard.
For example, the key combination ^D or Ctrl-D means that you hold
down the Control key while you press the D key. (Keys are indicated in
capital letters but are not case sensitive.)
^ or Ctrl
Commands and keywords and user-entered text appear in bold font.bold font
Document titles, new or emphasized terms, and arguments for which you
supply values are in italic font.
Italic font
Terminal sessions and information the system displays appear in courier
font.
Courier font
Bold Courier font indicates text that the user must enter.Bold Courier font
Elements in square brackets are optional.[x]
An ellipsis (three consecutive nonbolded periods without spaces) after
a syntax element indicates that the element can be repeated.
...
A vertical line, called a pipe, indicates a choice within a set of keywords
or arguments.
|
Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX
OL-29065 ix

DescriptionConvention
Optional alternative keywords are grouped in brackets and separated by
vertical bars.
[x | y]
Required alternative keywords are grouped in braces and separated by
vertical bars.
{x | y}
Nested set of square brackets or braces indicate optional or required
choices within optional or required elements. Braces and a vertical bar
within square brackets indicate a required choice within an optional
element.
[x {y | z}]
A nonquoted set of characters. Do not use quotation marks around the
string or the string will include the quotation marks.
string
Nonprinting characters such as passwords are in angle brackets.< >
Default responses to system prompts are in square brackets.[ ]
An exclamation point (!) or a pound sign (#) at the beginning of a line
of code indicates a comment line.
!, #
Reader Alert Conventions
This document uses the following conventions for reader alerts:
Means reader take note. Notes contain helpful suggestions or references to material not covered in the
manual.
Note
Means the following information will help you solve a problem.
Tip
Means reader be careful. In this situation, you might do something that could result in equipment damage
or loss of data.
Caution
Means the described action saves time. You can save time by performing the action described in the
paragraph.
Timesaver
Means reader be warned. In this situation, you might perform an action that could result in bodily
injury.
Warning
Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX
xOL-29065
Preface
Document Conventions