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Chapter 4 Configuring Routing Between VLANs with IEEE 802.1Q Encapsulation

IEEE 802.1Q Encapsulation Configuration Task List

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Cisco 1710 Security Router Software Configuration Guide

78-12696-01

To route IP over IEEE 802.1Q between VLANs, you need to customize the

subinterface to create the environment in which it will be used. Perform these

tasks in the order in which they appear:

• Enabling IP Routing

• Defining the VLAN Encapsulation Format

• Assigning an IP Address to a Network Interface

Enabling IP Routing

IP routing is automatically enabled in the Cisco IOS software for routers. To

re-enable IP routing if it has been disabled, use the following command in global

configuration mode:

Once you have IP routing enabled on the router, you can customize the

characteristics to suit your environment. If necessary, refer to the IP configuration

chapters in the Cisco IOS IP and IP Routing Configuration Guide for guidelines

on configuring IP.

Defining the VLAN Encapsulation Format

To define the encapsulation format as IEEE 802.1Q, use the following commands

in interface configuration mode:

Command Purpose

ip routing

Enables IP routing on the router.

Command Purpose

Step 1

interface fastethernet

port.subinterface-number

Specifies the subinterface on which IEEE 802.1Q

will be used.

Step 2

encapsulation dot1q vlanid

Defines the encapsulation format as IEEE 802.1Q

(dot1q) and specifies the VLAN identifier.

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Cisco 1710 Especificaciones Pagina 60