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VPRN (Virtual Private Routed Network)


VPRN Overview

VPRN (Virtual Private Routed Network) is a Multipoint-to-Multiponit Layer 3 VPN Service that connects multiple branches in a single logical routed architecture over IP/MPLS network of a Service Provider. This is called Layer 3 VPN generally, but Alcatel-Lucent define this Layer 3 VPN as VPRN(Virtual Private Routed Network).

Different brances of a customer, pass through the IP/MPLS network of Service Provider and this Layer 3 VPN infrastructure seems to the customer as their branches are connected to a single company Router.

Many different customer networks exist in this IP/MPLS network. And these are managed by Service Provider. Each of the customer in IP/MPLS network does not know the other network and use the Service Provider managed IP/MPLS network as their own. This provides indipendence to the customer and efficient usage of network to the Service Provider.

Logical View of VPRN

With VPRN, multiple sites of the customer can connect over the IP/MPLS Network of Service Provider. So, from the customer perspective, the sites are connected to a Router.

You can see the logical view of VPRN below:


Logical View of VPRN

Here, the SAPs are the access interfaces. In Alcatel-Lucent terminolagy, this is called SAP and need to be created before the configuration. We will talked about it in another article. For now, think that this is a normal interface on Cisco Routers.

In VPRN, IP addresses are important, because it works on Layer 3.The traffic is routed according to IP addresses. This is the same logic used by routers. Think about this, a mini router in the main Servis Router.

From the customer perspective, VPRN service seem like below:

Alcatel-Lucent, Customer View of VPRN

Customer View of VPRN

What is the benefits of VPRN?

There are many benefits of VPRN Service. These benefits are for both customer and Service Provider. These benefits are mentions one by one below:

• Service Provider can serve multiple customers over a single IP/MPLS network

• Customers can use any private IP subnets

• By using Service Provider IP/MPLS network, customers provide Redundancy easily

• Customers benefit using a Service Privder managed IP/MPLS network without extra effors

VPRN Routers

The routers used in VPRN Service is mainly the same routers used in IP/MPLS networks. We have also talked about them before. Here, as a summary, let’s remember these devices.

Provider Router (P) : Service Provider Core Routers. Unaware of service. Only provides transport with MPLS Label Swapping.

Provider Edge Router (PE) : Service Provider Core Routers that are towards Customer. Services are defined on these routers. PE Routers exchange VPRN routes with other PE Routers.

Cusomer Edge Router (CE) : Customer Routers that towards to Service Provider Edge Routers.

vprn-devices

A Simple VPRN Example

As an example, you can check the below picture. In this picture, there are two customers each has two sites. VPRN 1 service is for Customer 1 and VPRN 2 service is for Customer 2.Each site has their own ip block and one block is overlapped as you see. Overlapped blocks can be used by different Customers in different VPRN service i as we said before. And below, you can also see the VRF Tables of PE routers.

Alcatel-Lucent, VPRN VRF Tables

VPRN VRF Tables

Do not worry! Here, we have talked about basic overview of VPRN. In the following articles, we will talk about How VPRN works detailly.

You can continue with other VPRN Articles…

VPRN (Virtual Private Routed Network) – VPRN Overview
VPRN (Virtual Private Routed Network) – VPRN Labels
VPRN (Virtual Private Routed Network) – How Does VPRN Work?
VPRN (Virtual Private Routed Network) – VPRN Control Plane Activities
VPRN (Virtual Private Routed Network) – VPRN Data Plane Activities
VPRN (Virtual Private Routed Network) – Alcatel-Luncet (Nokia) VPRN Configuration

General Alcatel-Lucent (Nokia) VPN Service Articles…

Alcatel-Lucent L2 VPN and L3 VPN Services – Part 1 (Service Terms and Service Creation Steps)
Alcatel-Lucent L2 VPN and L3 VPN Services – Part 2 (Service Types)
Alcatel-Lucent L2 VPN and L3 VPN Services – Part 3 (Network Preparation)
Alcatel-Lucent L2 VPN and L3 VPN Services – Part 4 (Tunnel Structure)

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About the Author
Gokhan Kosem is a telecommunation and network engineer. His ambition to IP networks and end-to-end system installation made him to prepare this web-site. By sharing his experiences about various networking protocols beside different system installation experiences and Cisco, Juniper, Alcatel-Lucent devices configurations, he is aimed to be helpful for his collegues in all over the world. He is currently lives in Istanbul, Turkey.

One comment for “VPRN (Virtual Private Routed Network) – Part 1”

1
Remy MURENZI

hello sir,

am happy to meet you through this page!
i need your helper for me to know networking
very well;so help me to know ROUTING,VPN,ETC
therefore all knowledge concern networking

June 4th, 2015 at 11:51

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