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
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Text Part Number: OL-29065

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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
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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
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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
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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
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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
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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.
|
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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
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Preface
Document Conventions

Related Documentation
Before installing or upgrading the switch, refer to the release notes.Note
•Catalyst 2960-X Switch, located at http://www.cisco.com/go/cat2960x_docs.
•Cisco SFP and SFP+ modules documentation, including compatibility matrixes, located at:
http://www.cisco.com/en/US/products/hw/modules/ps5455/tsd_products_support_series_home.html
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, submitting a service request, and gathering additional information,
see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco
technical documentation, at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
Subscribe to the What's New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed
and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free
service and Cisco currently supports RSS version 2.0.
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Preface
Related Documentation

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Preface
Obtaining Documentation and Submitting a Service Request

CHAPTER 1
Using the Command-Line Interface
This chapter contains the following topics:
•Information About Using the Command-Line Interface, page 1
•How to Use the CLI to Configure Features, page 5
Information About Using the Command-Line Interface
This section describes the Cisco IOS command-line interface (CLI) and how to use it to configure your switch.
Command Modes
The Cisco IOS user interface is divided into many different modes. The commands available to you depend
on which mode you are currently in. Enter a question mark (?) at the system prompt to obtain a list of commands
available for each command mode.
You can start a CLI session through a console connection, through Telnet, a SSH, or by using the browser.
When you start a session, you begin in user mode, often called user EXEC mode. Only a limited subset of
the commands are available in user EXEC mode. For example, most of the user EXEC commands are one-time
commands, such as show commands, which show the current configuration status, and clear commands,
which clear counters or interfaces. The user EXEC commands are not saved when the switch reboots.
To have access to all commands, you must enter privileged EXEC mode. Normally, you must enter a password
to enter privileged EXEC mode. From this mode, you can enter any privileged EXEC command or enter
global configuration mode.
Using the configuration modes (global, interface, and line), you can make changes to the running configuration.
If you save the configuration, these commands are stored and used when the switch reboots. To access the
various configuration modes, you must start at global configuration mode. From global configuration mode,
you can enter interface configuration mode and line configuration mode.
This table describes the main command modes, how to access each one, the prompt you see in that mode, and
how to exit the mode.
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Table 1: Command Mode Summary
About This ModeExit MethodPromptAccess MethodMode
Use this mode to
•Change
terminal
settings.
•Perform basic
tests.
•Display
system
information.
Enter logout or
quit.
Switch>
Begin a session
using Telnet, SSH,
or console.
User EXEC
Use this mode to
verify commands
that you have
entered. Use a
password to protect
access to this mode.
Enter disable to
exit.
Switch#
While in user EXEC
mode, enter the
enable command.
Privileged EXEC
Use this mode to
configure
parameters that
apply to the entire
switch.
To exit to privileged
EXEC mode, enter
exit or end, or press
Ctrl-Z.
Switch(config)#
While in privileged
EXEC mode, enter
the configure
command.
Global
configuration
Use this mode to
configure VLAN
parameters. When
VTP mode is
transparent, you can
create
extended-range
VLANs (VLAN IDs
greater than 1005)
and save
configurations in the
switch startup
configuration file.
To exit to global
configuration mode,
enter the exit
command.
To return to
privileged EXEC
mode, press Ctrl-Z
or enter end.
Switch(config-vlan)#
While in global
configuration mode,
enter the vlan
vlan-id command.
VLAN
configuration
Use this mode to
configure
parameters for the
Ethernet ports.
To exit to global
configuration mode,
enter exit.
To return to
privileged EXEC
mode, press Ctrl-Z
or enter end.
Switch(config-if)#
While in global
configuration mode,
enter the interface
command (with a
specific interface).
Interface
configuration
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Using the Command-Line Interface
Command Modes

About This ModeExit MethodPromptAccess MethodMode
Line configuration Use this mode to
configure
parameters for the
terminal line.
To exit to global
configuration mode,
enter exit.
To return to
privileged EXEC
mode, press Ctrl-Z
or enter end.
Switch(config-line)#
While in global
configuration mode,
specify a line with
the line vty or line
console command.
Using the Help System
You can enter a question mark (?) at the system prompt to display a list of commands available for each
command mode. You can also obtain a list of associated keywords and arguments for any command.
SUMMARY STEPS
1. help
2. abbreviated-command-entry ?
3. abbreviated-command-entry <Tab>
4. ?
5. command ?
6. command keyword ?
DETAILED STEPS
PurposeCommand or Action
Obtains a brief description of the help system in any
command mode.
help
Example:
Switch# help
Step 1
Obtains a list of commands that begin with a particular
character string.
abbreviated-command-entry ?
Example:
Switch# di?
dir disable disconnect
Step 2
Completes a partial command name.
abbreviated-command-entry <Tab>
Example:
Switch# sh conf<tab>
Switch# show configuration
Step 3
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Using the Command-Line Interface
Using the Help System

PurposeCommand or Action
Lists all commands available for a particular command
mode.
?
Example:
Switch> ?
Step 4
Lists the associated keywords for a command.
command ?
Example:
Switch> show ?
Step 5
Lists the associated arguments for a keyword.
command keyword ?
Example:
Switch(config)# cdp holdtime ?
<10-255> Length of time (in sec) that receiver
Step 6
must keep this packet
Understanding Abbreviated Commands
You need to enter only enough characters for the switch to recognize the command as unique.
This example shows how to enter the show configuration privileged EXEC command in an abbreviated form:
Switch# show conf
No and default Forms of Commands
Almost every configuration command also has a no form. In general, use the no form to disable a feature or
function or reverse the action of a command. For example, the no shutdown interface configuration command
reverses the shutdown of an interface. Use the command without the keyword no to reenable a disabled feature
or to enable a feature that is disabled by default.
Configuration commands can also have a default form. The default form of a command returns the command
setting to its default. Most commands are disabled by default, so the default form is the same as the no form.
However, some commands are enabled by default and have variables set to certain default values. In these
cases, the default command enables the command and sets variables to their default values.
CLI Error Messages
This table lists some error messages that you might encounter while using the CLI to configure your switch.
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Understanding Abbreviated Commands

Table 2: Common CLI Error Messages
How to Get HelpMeaningError Message
Reenter the command followed by
a question mark (?) with a space
between the command and the
question mark.
The possible keywords that you can
enter with the command appear.
You did not enter enough
characters for your switch to
recognize the command.
% Ambiguous command: "show
con"
Reenter the command followed by
a question mark (?) with a space
between the command and the
question mark.
The possible keywords that you can
enter with the command appear.
You did not enter all the keywords
or values required by this
command.
% Incomplete command.
Enter a question mark (?) to display
all the commands that are available
in this command mode.
The possible keywords that you can
enter with the command appear.
You entered the command
incorrectly. The caret (^) marks the
point of the error.
% Invalid input detected at
‘^’marker.
Configuration Logging
You can log and view changes to the switch configuration. You can use the Configuration Change Logging
and Notification feature to track changes on a per-session and per-user basis. The logger tracks each
configuration command that is applied, the user who entered the command, the time that the command was
entered, and the parser return code for the command. This feature includes a mechanism for asynchronous
notification to registered applications whenever the configuration changes. You can choose to have the
notifications sent to the syslog.
Only CLI or HTTP changes are logged.Note
How to Use the CLI to Configure Features
Configuring the Command History
The software provides a history or record of commands that you have entered. The command history feature
is particularly useful for recalling long or complex commands or entries, including access lists. You can
customize this feature to suit your needs.
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Using the Command-Line Interface
Configuration Logging

Changing the Command History Buffer Size
By default, the switch records ten command lines in its history buffer. You can alter this number for a current
terminal session or for all sessions on a particular line. This procedure is optional.
SUMMARY STEPS
1. terminal history [size number-of-lines]
DETAILED STEPS
PurposeCommand or Action
Changes the number of command lines that the switch records during
the current terminal session in the privileged EXEC mode. You can
configure the size from 0 through 256.
terminal history [size number-of-lines]
Example:
Switch# terminal history size 200
Step 1
Recalling Commands
To recall commands from the history buffer, perform one of the actions listed in this table. These actions are
optional.
The arrow keys function only on ANSI-compatible terminals such as VT100s.Note
SUMMARY STEPS
1. Ctrl-P or use the up arrow key
2. Ctrl-N or use the down arrow key
3. show history
DETAILED STEPS
PurposeCommand or Action
Recalls commands in the history buffer, beginning with the most recent command.
Repeat the key sequence to recall successively older commands.
Ctrl-P or use the up arrow key
Step 1
Returns to more recent commands in the history buffer after recalling commands
with Ctrl-P or the up arrow key. Repeat the key sequence to recall successively
more recent commands.
Ctrl-N or use the down arrow key
Step 2
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Configuring the Command History

PurposeCommand or Action
Lists the last several commands that you just entered in privileged EXEC mode.
The number of commands that appear is controlled by the setting of the terminal
show history
Example:
Switch# show history
Step 3
history global configuration command and the history line configuration
command.
Disabling the Command History Feature
The command history feature is automatically enabled. You can disable it for the current terminal session or
for the command line. This procedure is optional.
SUMMARY STEPS
1. terminal no history
DETAILED STEPS
PurposeCommand or Action
Disables the feature during the current terminal session in the
privileged EXEC mode.
terminal no history
Example:
Switch# terminal no history
Step 1
Enabling and Disabling Editing Features
Although enhanced editing mode is automatically enabled, you can disable it, and reenable it.
SUMMARY STEPS
1. terminal editing
2. terminal no editing
DETAILED STEPS
PurposeCommand or Action
Reenables the enhanced editing mode for the current terminal
session in the privileged EXEC mode.
terminal editing
Example:
Switch# terminal editing
Step 1
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Enabling and Disabling Editing Features

PurposeCommand or Action
Disables the enhanced editing mode for the current terminal session
in the privileged EXEC mode.
terminal no editing
Example:
Switch# terminal no editing
Step 2
Editing Commands through Keystrokes
The keystrokes help you to edit the command lines. These keystrokes are optional.
The arrow keys function only on ANSI-compatible terminals such as VT100s.Note
Table 3: Editing Commands
DescriptionEditing Commands
Moves the cursor back one character.Ctrl-B or use the left arrow key
Moves the cursor forward one character.Ctrl-F or use the right arrow key
Moves the cursor to the beginning of the command
line.
Ctrl-A
Moves the cursor to the end of the command line.Ctrl-E
Moves the cursor back one word.Esc B
Moves the cursor forward one word.Esc F
Transposes the character to the left of the cursor with
the character located at the cursor.
Ctrl-T
Erases the character to the left of the cursor.Delete or Backspace key
Deletes the character at the cursor.Ctrl-D
Deletes all characters from the cursor to the end of
the command line.
Ctrl-K
Deletes all characters from the cursor to the beginning
of the command line.
Ctrl-U or Ctrl-X
Deletes the word to the left of the cursor.Ctrl-W
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Enabling and Disabling Editing Features