VLAN Range [Cisco IOS Software Releases 12.4 Mainline]

Table Of Contents

VLAN Range

Finding Feature Information

Contents

Restrictions for the VLAN Range Feature

Information About the VLAN Range Feature

Virtual Local Area Network Definition

Benefits of the VLAN Range Feature

How to Configure the VLAN Range Feature

Configuring a Range of VLAN Subinterfaces

Verifying the VLAN Range Configuration

VLAN Range Configuration Examples

VLAN Range Configuration: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for the VLAN Range Feature

VLAN Range

First Published: February 25, 2002

Last Updated: March 29, 2005

The VLAN Range feature allows you to organize VLAN subinterfaces into groups (or ranges) so that any commands applied to the group can also apply to each subinterface within the group.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for the VLAN Range Feature" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

This document includes the following sections:

•Restrictions for the VLAN Range Feature

•Information About the VLAN Range Feature

•How to Configure the VLAN Range Feature

•VLAN Range Configuration Examples

•Additional References

•Feature Information for the VLAN Range Feature

Restrictions for the VLAN Range Feature

•Each command you enter while you are in interface configuration mode with the interface range command is executed as you enter the command. The commands are not grouped together for execution after you exit interface configuration mode. If you exit interface configuration mode while the commands are being executed, some commands might not be executed on some interfaces in the range. Wait until the command prompt reappears before exiting interface configuration mode.

•The no interface range command is not supported. You must delete individual subinterfaces to delete a range.

Information About the VLAN Range Feature

Before configuring the VLAN Range feature, you should be familiar with the following concepts.

•Virtual Local Area Network Definition

•Benefits of the VLAN Range Feature

Virtual Local Area Network Definition

A virtual local area network (VLAN) is a switched network that is logically segmented on an organizational basis, by functions, project teams, or applications rather than on a physical or geographical basis. For example, all workstations and servers used by a particular workgroup team can be connected to the same VLAN, regardless of their physical connections to the network or whether they are intermingled with other teams. Reconfiguration of the network can be done through software rather than by physically unplugging and moving devices or wires.

A VLAN can be thought of as a broadcast domain that exists within a defined set of switches. A VLAN consists of a number of end systems, either hosts or network equipment (such as bridges and routers), connected by a single bridging domain. The bridging domain is supported on various pieces of network equipment; for example, LAN switches that operate bridging protocols between them with a separate bridge group for each VLAN.

VLANs are created to provide the segmentation services traditionally provided by routers in LAN configurations. VLANs address scalability, security, and network management issues. Routers in VLAN topologies provide broadcast filtering, security, address summarization, and traffic flow management. The switches within the defined group will not bridge any frames, not even broadcast frames, between two VLANs.

For more information about VLANs, see the "Configuring Routing Between VLANs" module.

Benefits of the VLAN Range Feature

The VLAN Range feature provides the following benefits:

•Simultaneous configurations

Identical commands can be entered once for a range of subinterfaces, rather than being entered separately for each subinterface.

•Overlapping range configurations

Overlapping ranges of subinterfaces can be configured.

•Customized subinterfaces

Individual subinterfaces within a range can be customized or deleted.

How to Configure the VLAN Range Feature

This section contains the following procedures:

•Configuring a Range of VLAN Subinterfaces (Required)

•Verifying the VLAN Range Configuration (Optional)

Configuring a Range of VLAN Subinterfaces

To configure a range of VLAN subinterfaces, perform the following steps.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface range {fastethernet number - number | gigabitethernet number - number | loopback number | tunnel number | port-channel number | vlan number | macro word}

4. encapsulation dot1Q vlan-id

5. end

Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure terminal
Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface range {fastethernet number - number | gigabitethernet number - number | loopback number | tunnel number | port-channel number | vlan number | macro word}
Example:

Router(config)# interface range fastethernet 1 - 5

Selects the range of subinterfaces to be configured and enters interface range configuration mode.

•Enter the range of subinterfaces to be configured.

Note The spaces around the dash are required. For example, the command interface range fastethernet 1 - 5 is valid; the command interface range fastethernet 1-5 is not valid.

Step 4

encapsulation dot1Q vlan-id
Example:

Router(config-int-range)# encapsulation dot1q 101

Applies a unique VLAN ID to each subinterface within the range.

•Enter the unique VLAN ID. The allowed range is from 1 to 4095

Note The VLAN ID specified by the vlan-id argument is applied to the first subinterface in the range. Each subsequent interface is assigned a VLAN ID, which is the specified vlan-id plus the subinterface number minus the first subinterface number (VLAN ID + subinterface number - first subinterface number).

Step 5

end
Example:

Router(config-int-range)# end

Exits global configuration mode.

DETAILED STEPS

Verifying the VLAN Range Configuration

To verify the VLAN Range configuration, perform the following steps.

SUMMARY STEPS

1. enable

2. show running-config

3. show interfaces

4. end

DETAILED STEPS

Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

show running-config
Example:

Router# show running-config

Displays the contents of the current running configuration file or the configuration for a specific module, Layer 2 VLAN, class map, interface, map class, policy map, or virtual circuit (VC) class.

Step 3

show interfaces
Example:

Router# show interfaces

Displays statistics for all interfaces configured on the router or access server.

Step 4

end
Example:

Router# end

Exits privileged EXEC mode.

VLAN Range Configuration Examples

This section provides the following configuration example:

•VLAN Range Configuration: Example

VLAN Range Configuration: Example

The following is a sample VLAN range configuration. This sample configures Fast Ethernet subinterfaces within the range 5/1.1 and 5/1.4 and applies the following VLAN IDs to those subinterfaces:

•Fast Ethernet5/1.1 = VLAN ID 301 (vlan-id)

•Fast Ethernet5/1.2 = VLAN ID 302 (vlan-id = 301 + 2 - 1 = 302)

•Fast Ethernet5/1.3 = VLAN ID 303 (vlan-id = 301 + 3 - 1 = 303)

•Fast Ethernet5/1.4 = VLAN ID 304 (vlan-id = 301 + 4 - 1 = 304)
Router(config)# interface range fastethernet5/1.1 - fastethernet5/1.4 
Router(config-if)# encapsulation dot1Q 301
Router(config-if)# no shutdown 
Router(config-if)#
*Oct  6 08:24:35: %LINK-3-UPDOWN: Interface FastEthernet5/1.1, changed state to up
*Oct  6 08:24:35: %LINK-3-UPDOWN: Interface FastEthernet5/1.2, changed state to up
*Oct  6 08:24:35: %LINK-3-UPDOWN: Interface FastEthernet5/1.3, changed state to up
*Oct  6 08:24:35: %LINK-3-UPDOWN: Interface FastEthernet5/1.4, changed state to up
*Oct  6 08:24:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet5/1.1, 
changed state to up
*Oct  6 08:24:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet5/1.2, 
changed state to up
*Oct  6 08:24:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet5/1.3, 
changed state to up
*Oct  6 08:24:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet5/1.4, 
changed state to up
Additional References

The following sections provide references related to the VLAN Range feature.

Related Documents

Related Topic

Document Title

IP LAN switching commands: complete command syntax, command mode, defaults, usage guidelines, and examples

Cisco IOS LAN Switching Services Command Reference

VLANs

"Configuring Routing Between VLANs" module

Specifying interface ranges

"Interface Range Specification" module

Standards

Standard

Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

—

MIBs

MIB

MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFC

Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

—

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for the VLAN Range Feature

Table 1 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

Table 1 VLAN Range Feature

Feature Name

Releases

Feature Information

VLAN Range

12.2(8)T
12.2(13)T

The VLAN Range feature allows you to organize VLAN subinterfaces into groups (or ranges) so that any commands applied to the group can also apply to each subinterface within the group.

The following commands were introduced or modified: interface range, encapsulation dot1q.

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