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Implementing Inter-VLAN Routing

Chapter Description

The CCNP and CCIE Enterprise Core & CCNP Enterprise Advanced Routing Portable Command Guide is a fully updated quick reference resource to help you memorize commands and concepts for CCNP or CCIE certifications. In this sample chapter, you will review information and commands related to implementing inter-VLAN routing.

This chapter provides information and commands concerning the following topics:

  • Inter-VLAN communication using an external router: router-on-a-stick

  • Inter-VLAN communication tips

  • Inter-VLAN communication on a multilayer switch through an SVI

    • Configuring inter-VLAN communication on an L3 switch

  • Removing L2 switchport capability of an interface on an L3 switch

  • Configuration example: inter-VLAN communication

  • Configuration example: IPv6 inter-VLAN communication

Inter-VLAN Communication Using an External Router: Router-on-a-Stick

Router(config)#
interface
fastethernet 0/0

Moves to interface configuration mode

Router(config-if)# no
shutdown

Enables the interface

Router(config-if)#
interface fastethernet
0/0.1

Creates subinterface 0/0.1 and moves to subinterface configuration mode

Router(config-subif)#
description Management
VLAN 1

(Optional) Sets the locally significant description of the subinterface

Router(config-subif)#
encapsulation
dot1q 1 native

Assigns VLAN 1 to this subinterface. VLAN 1 will be the native VLAN. This subinterface uses the 802.1q tagging protocol

Router(config-subif)#
ip address 192.168.1.1
255.255.255.0

Assigns the IP address and netmask

Router(config-subif)#
interface fastethernet
0/0.10

Creates subinterface 0/0.10 and moves to subinterface configuration mode

Router(config-subif)#
description Accounting
VLAN 10

(Optional) Sets the locally significant description of the subinterface

Router(config-subif)#
encapsulation dot1q 10

Assigns VLAN 10 to this subinterface. This subinterface uses the 802.1q tagging protocol

Router(config-subif)#
ip address 192.168.10.1
255.255.255.0

Assigns the IP address and netmask

Router(config-subif)#
end

Returns to interface configuration mode

2. Inter-VLAN Communication Tips | Next Section

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