MPLS VPN Network Implementation

This report details the implementation of a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) connecting three offices (LON, PAR, US) using Cisco 2811 routers. The report covers the network design, which utilizes MPLS VPN for its quality of service and security advantages over other WAN technologies. The implementation includes configuring Customer Edge (CE) and Provider Edge (PE) routers, establishing connections between PE routers using MP-BGP, and configuring PE-to-CE links using either static routing or OSPF. IPsec is used to secure the connection between LON and PAR. The report also discusses the configuration of routers, including enabling ip-cef, setting up VRFs, and configuring import/export features for MP-BGP. The conclusion highlights the benefits of using MPLS VPN technology for secure and efficient communication between geographically dispersed offices.

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Table of Contents
Introduction...........................................................................................................................................2
MPLS VPN and CISCO 2811....................................................................................................................3
Network Implementation......................................................................................................................3
Connections Implemented....................................................................................................................4
Customers edge (CE) router and Customers(C) router..........................................................................4
Providers(P) core router and Providers edge(PE) router.......................................................................4
Configuration of Routers.......................................................................................................................5
Establishing a Connection between PE Routers....................................................................................6
PE to CE Link Implementation...............................................................................................................6
Implementation and Methodology.......................................................................................................6
Conclusion.............................................................................................................................................7
References.............................................................................................................................................8

Introduction
The Following Report is an overview of the establishing a network between the offices in
various locations. Each place has its own working and its importance. They also must have
some privacy since there will be some managerial information transfers for the company. So
we have to provide the networking based on the requirement. The proposed Method in this
type is MPLS VLN .This Method is used since it is quality of service and stability compared
to other WAN networks is high. Using MPLS, the carrier use WAN routing protocol. This
makes MPLS operationally easier than controlling a large routed network. This means, that
companies can reduce the man power on WAN. Multiprotocol Label Switching is an
Protocol developed by IETF for betterment of traditional Internet Protocol routing
technique. MPLS is a technique used by network provider to give a better and unique
network architecture for real-time traffic in all kinds of data.
MPLS VPN and CISCO 2811
Multiprotocol Label Switching (MPLS) provides the technique to perform label
switching, which is a unique method for dynamic performance packet forwarding. MPLS and
VPNs gives the first wider discussion particular to Cisco MPLS architecture. Multiprotocol
Label Switching and Virtual Private Network has a major application using MPLS theory and
configuration, network design issues.
In this type of network we are using MPLS VLN Method i.e. Multiprotocol Label
Switching has been an important enhancement in Internet Protocol technique for users
and places that require to avail connectivity. Enterprises are focusing towards network
providers which provide MPLS VPN. It has large number of users since it as many
advantages over various VPN protocols . There are many innovative features possessed by
Multiprotocol Label Switching and Virtual Private Network, like VoIP by CoS, variable
bandwidth, data on a single channel through various resources, nowadays Multiprotocol
Label Switching and Virtual Private Network has become the updated technology in
Internet Protocol technology. We are using CISCO 2811 which provides Wire speed
performance for current services such as privacy and data, and other services to many

T1/E1/DSL WAN rates it also has a compatibility for majority of existing AIMs, NMs,
WICs, VWICs, and VICs
Network Implementation
The Network comprises a connection between three offices in three different places
namely, LON (head office), PAR and US and each place has its own working. The LON
offices takes care of the Management and finance sectors.PAR offices has a HR team and a
IT team Working and finally the production Dept is in US.
The LON office is directly connected with the fast Ethernet since it takes care of the
financial and management side. PAR office is also connected with the core MPLS, the
connection from PAR to LON exists through this MPLS VLN mesh. All the three Offices
are connected to a central hub known as MPLS VLN .The link between LON and PAR
are produced by implementing IPSec protocol. The production house in US does not have
a access to LON or PAR offices because there must a privacy in managerial functions.
When the packet goes to the Multiprotocol Label Switching algorithm, Label
Edge router gets the packet and implement label the Multiprotocol Label Switching
label to the packet and given to the upcoming hub via the Label Switch Path. When the
packet reaches the next Label Edge router, it switch the incoming label with the outgoing
label and gives the packet. When the Label Edge router gets the packet, it slips off the
packet label and forwards it to the final router. All the Label Edge routers present in the
MPLS network have a separate Interior Gateway Protocol which is running throughout the
network. To compromise the distribution task, adjacent Label Edge routers must accept on
the label that is used for each Interior Gateway Protocol prefix.
Connections Implemented
MPLS VLN Core is the mesh from where each and every offices is connected using
Ethernet in each office there are several connections based on the requirement. In LON
office the finance side has about 30 users and management side comprises 20 users.
Similarly in PAR office there are 20 users in IT side and 20 users in HR side. In US there
are about 100 users.

There are two routers in the provider network, they are Provider’s Edge and
Provider’s routers. The Provider Edge router is connected along with the Customer’s Edge
router of the customer networks. Both Provider Edge and Provider routers should run in
Multiprotocol Label Switching so that they can provide labels to each other and forward
packets to random paths.
Customers edge (CE) router and Customers(C) router
CE and C refers to the data in this packet that was created from devices . All devices
used in this technique has a clean configuration provided by the router protocol. We need
to consider that if working in a live network we have to provide the keen and essential
commands for potential. In our network LON, PAR, and US are considered as CE While C
refers to the final routers such as Management, HR, IT, finance and production department
of their respective offices.
Providers(P) core router and Providers edge(PE) router
P Router in Multiprotocol Label Switching or Provider Router is a Label
Switch Router that functions as a transit router of the core network. The provider Router
can be connected to one or more provider edge Routers. A PE router is a router situates
on the user premises that gives an Ethernet facility for both the customers Local area
network and Provider router.
The company comes out with separate IP providers for various offices,
LON (head office) 10.25.25.2/30
PAR 10.25.25.2/30
US 10.25.25.18/30
Since PAR and LON have direct MPLS VPN links they are provided with a same PE
router configuration and also they are secured using a IP Security is a framework of open
standards for providing privacy, secured network all over Internet Protocols, with the help
of cryptographic security service. It is shortly called as IPSec

Configuration of Routers
Configuration process starts with Enabling ip-cef. in order to enable ip-cef we have to
establish a VRF for every Virtual Private Network connected using the ip- vrf command we
also have to Specify the path distinguisher using that Virtual Private Network. This is used
to forward the limit of IP address so that we can locate which Virtual Private Network it
belongs . Then we have to configure the import and export features for the MP-BGP extended
networks. These are used for reducing the import and export process. Next Step is to
Configure the forwarding detail for the interfaces using the ip- vrf forwarding command and
remember to set up the IP address after doing this. On comparing the PE-CE routing
protocol we are using, we can configure static routes or routing between Providers Edge and
Customers Edge.
For establishment of Multiprotocol Label Switching Virtual Private Network, routers
must have following hardware and software requirements to support the Multiprotocol Label
Switching Virtual Private Network Router that support MPLS topology Cisco IOS.
Software that provides with VPN features and a 64 MB of flash with at least 192 DRAM.
For CE routers, any router that can be able to give routing information with its PE router.
Establishing a Connection between PE Routers
Setting up the Multi protocol Border Gateway Protocol between the Provider Edge
routers. There are several steps to configure BGP, such as using the some particular
methods. The direct neighbour configuration is the simplest and the low scalable. Assign the
different neighbours for connection. Provide a address for family ipv4- vrf command for all
Virtual Private Network present at this Providers Edge path then we have to Distribute the
static routing, RIP, or OSPF information along the routers of PE so that they can be able to
communicate with their respective customer edge routers. Then Provide address family vpn-
v4 mode, powerup the neighbours specify extended group must be used in the process.

PE to CE Link Implementation
In this Method of networking ,service providers to configure Open Shortest Path First
between provider edge and customer edge devices in an MPLS VPN network. This has
increased flexibility when devices exchange routing information among sites because a
separate router ID for each interface or sub interface is provided and configured on a PE
device attached to multiple CE devices within a VPN.The first option is to run static routing
between both PE- and CE-routers routing. An Important technique that is established in
OSPF is Interior Gateway Protocols (IGP). In an MPLS, OSPF is not used to route customer
traffic. It is only used to provide routing for the internal provider network so that labels can
be generated. LDP is used to advertise these labels to neighbouring label-switched routers
hence IGP provides a keen role in making the OSPF to communicate
Implementation and Methodology
A Multiprotocol Label Switching network is a keen network which supports
Multiprotocol Label Switching network enabled routers called Label Switch Routers . The
network has a core Label Switch Routers with an edge Label Switch Routers which
provides labels to packets. The working is implemented by Routing tables of the different
LSRs are calculated along with an Interior Gateway Protocol . A link state protocol, such as
Open Shortest Path First is required if we have networking to deploy MPLS TE.
This setup provides the contact between MP-BGP running between Provider Edge
routers and Open Shortest Path First protocol(OSPF)l working inside a VPN implemented
with Multiprotocol Label Switching Virtual Private network technology. The OSPF routes
gets one PE-router can be propagated across the MPLS core system and distributed back into
OSPF at other site as external OSPF routers.

Conclusion
Hence through this techniques and implementation methods, we can able to provide a
communication with offices in various location with a secured manner. It provides effective
methods of technologies and protocols to solve the most pressing network-design problems.
It helps to study the importance in providing Multiprotocol Label Switching Virtual Private
network technology in the traditional IP-v4 network. MPLS VPN network provides unique
bandwidth between provider network and customer site to accomplish the needs of VoIP.
Thus due to these facilities like variable bandwidth, capturing of data’s in a single
infrastructure Multiprotocol Label Switching Virtual Private network technology has
become most wanted technology in IP technology.

References
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at: https://www.theseus.fi/bitstream/handle/10024/103442/Sanjib
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Ijettjournal. 2018. A Design Analysis of MPLS VPN Core Architecture and Network
Downtime Impact. [ONLINE] Available
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September 2018].
Omicsonline.org. (2018). 2018. Architecture for MPLS L3 VPN Deployment in
Service Provider Network. [ONLINE] Available at: https://www.omicsonline.org/open-
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Available at: https://www.racf.bnl.gov/Facility/TechnologyMeeting/Archive/06-30-04-
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