Introduction Of Traditional VPNModels Of Traditional VPNOverlay VPNPeer-To-Peer VPNMPLS VPNConclusion
Introduction Of TraditionalVPN They considered as old VPN technology. They are also known as “Leased Lines VPNs” because theyused leased lines for communication. In this type of VPN two or more networks are connected usinga dedicated line from an ISP. Using leased lines they make point-to-point connections.
This is one of the model of traditional VPN.In its environment different sites of organizations areconnected through Virtual Circuit(VCs) that is offered by theSP.The VCs makes the communication between the sites morefeasible and effective.The data is gone through WAN switches to its destination.Overlay VPN
To overcome overlay VPNs disadvantages organizationswitched towards peer to peer VPN.In this type of model organization exchange their routinginformation with Service Provide(SP) without using the VCs.SP takes the charge of routing data for organizations.
It is the new technology of VPN with high performance MPLS (Multi-Protocol Label Switching) was originallydesigned to improve the store-and-forward speed of routers. It requires two or more sites for connection via same ISP
It directs data from one network node to the next based onshort path labels rather than long network addressesIt solves all the previous problems that were in overlay VPNand peer to peer VPN.
To avoid address overlapping MPLS used RD with privatedata space to make it VPNv4. This VPNv4 send by company’s CE to PE.Most companies used same PE so PE used VRF tomaintains each company route separately. When information send from source PE to destination PERT and VPN labels also send.
Two types of labels: top and bottom labelTop label is used to forward information from source PE todestination PE.When information send from source PE to destination PERT and VPN labels also send.Bottom label is used by destination PE that information issend to which CE.
CE sends routinginformation ofcompany to PE.PE receivesroutinginformationRoutinginformationcombines withRD of VRF toform VPNv4RT and labelsalso send todestination PEDestination PEinjects VPN routto correct VRFaccording to itsRT
CE sendspacket tosource PE.Compares IPaddress ofpacket withcorrect VRFPE sticks bothlabels onpacket.Top labelforwards it to P-router andbottom label todestination PEP-routerforwardspacketaccording totop labelDestination PEchecks packetVPN label andsends to correctCE
Through compassion between both VPNs we see that MPLSVPN is much more better than traditional VPN due to itshigh efficiency, cost effective, easy management and datasecurity. So MPLS VPN is a cost effective and secure solutionfor company customer to correct different sites around theworld.
http://ieeexplore.ieee.org/ Engineering Analysisand Research of MPLS VPN