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Implementing Inter-VLAN Routing

Contents

  1. Inter-VLAN Communication Using an External Router: Router-on-a-Stick
  2. Inter-VLAN Communication Tips
  3. Inter-VLAN Communication on a Multilayer Switch Through a Switch Virtual Interface
  4. Configuration Example: Inter-VLAN Communication
  5. Configuration Example: IPv6 Inter-VLAN Communication

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.

From the Book

CCNP and CCIE Enterprise Core & CCNP Enterprise Advanced Routing Portable Command Guide: All ENCOR (350-401) and ENARSI (300-410) Commands in One Compact, Portable Resource

CCNP and CCIE Enterprise Core & CCNP Enterprise Advanced Routing Portable Command Guide: All ENCOR (350-401) and ENARSI (300-410) Commands in One Compact, Portable Resource

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Inter-VLAN Communication on a Multilayer Switch Through a Switch Virtual Interface

NOTE

Rather than using an external router to provide inter-VLAN communication, a multilayer switch can perform the same task through the use of a switched virtual interface (SVI).

Configuring Inter-VLAN Communication on an L3 Switch

Switch9300(config)# interface
vlan 1

Creates a virtual interface for VLAN 1 and enters interface configuration mode

 
Switch9300(config-if)# ip address
172.16.1.1 255.255.255.0

Assigns an IP address and netmask

 
Switch9300(config-if)# no
shutdown

Enables the interface

 
Switch9300(config)# interface
vlan 10

Creates a virtual interface for VLAN 10 and enters interface configuration mode

 
Switch9300(config-if)# ip address
172.16.10.1 255.255.255.0

Assigns an IP address and netmask

 
Switch9300(config-if)# no
shutdown

Enables the interface

 
Switch9300(config)# interface
vlan 20

Creates a virtual interface for VLAN 20 and enters interface configuration mode

 
Switch9300(config-if)# ip address
172.16.20.1 255.255.255.0

Assigns an IP address and netmask

 
Switch9300(config-if)# no
shutdown

Enables the interface

 
Switch9300(config-if)# exit

Returns to global configuration mode

 
Switch9300(config)# ip routing

Enables routing on the switch

NOTE

For an SVI to go to up/up and be added to the routing table, the VLAN for the SVI must be created, an IP address must be assigned, and at least one interface must support it (trunk or access).

Removing L2 Switchport Capability of an Interface on an L3 Switch

Switch9300(config)# interface
gigabitethernet 0/1

Moves to interface configuration mode

 
Switch9300(config-if)#
no switchport

Creates a Layer 3 port on the switch

NOTE

You can use the no switchport command on physical ports only on a Layer 3-capable switch
4. Configuration Example: Inter-VLAN Communication | Next Section Previous Section

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