VLAN Translation with OTV on a Cisco ASR Router

Introduction

This document describes how to configure VLAN (Virtual Local Area Network) translation on a Cisco ASR router in order to establish layer 2 communication between devices in two different VLANs across an OTV (Overlay Transport Virtualization) network.

Network Diagram

Configure

Method 1 :

In this method, a VLAN tag rewrite is configured only on the Overlay interface of a Cisco ASR router in order to translate the VLAN tag from one VLAN to another.

ASR-1

On the Internal Interface :
service instance 10 ethernet
  encapsulation dot1q 10
  bridge-domain 10

On the Overlay Interface:
service instance 10 ethernet
  encapsulation dot1q 20
  rewrite ingress tag translate 1-to-1 dot1q 10 symmetric
  bridge-domain 10


ASR-2

On the Internal Interface :
service instance 20 ethernet
  encapsulation dot1q 20
  bridge-domain 20

On the Overlay Interface:
service instance 20 ethernet
  encapsulation dot1q 20
  bridge-domain 20

Method 2 :

In this method, a VLAN tag rewrite is configured on both the Internal and Overlay interfaces of a Cisco ASR router in order to remove one VLAN tag and then add a new one.

ASR-1

On the Internal Interface :
service instance 10 ethernet
  encapsulation dot1q 10
  rewrite ingress tag pop 1 symmetric
  bridge-domain 10

On the Overlay Interface:
service instance 10 ethernet
  encapsulation dot1q 20
  rewrite ingress tag pop 1 symmetric
  bridge-domain 10


ASR-2

On the Internal Interface :
service instance 20 ethernet
  encapsulation dot1q 20
  bridge-domain 20

On the Overlay Interface:
service instance 20 ethernet
  encapsulation dot1q 20
  bridge-domain 20