1. Presented By:
Sehrish Fatima
CT-016
VS

2. Introduction Of Traditional VPN
Models Of Traditional VPN
Overlay VPN
Peer-To-Peer VPN
MPLS VPN
Conclusion

3. Introduction Of Traditional
VPN
 They considered as old VPN technology.
 They are also known as “Leased Lines VPNs” because they
used leased lines for communication.
 In this type of VPN two or more networks are connected using
a dedicated line from an ISP.
 Using leased lines they make point-to-point connections.

4. Peer-To-Peer
VPNOverlay VPN
Models Of
Traditional VPN

5. This is one of the model of traditional VPN.
In its environment different sites of organizations are
connected through Virtual Circuit(VCs) that is offered by the
SP.
The VCs makes the communication between the sites more
feasible and effective.
The data is gone through WAN switches to its destination.
Overlay VPN

6. Model:

7. Advantages:
Security
Data
Isolation

8. High Cost
Difficult
Management

9. To overcome overlay VPN's disadvantages organization
switched towards peer to peer VPN.
In this type of model organization exchange their routing
information with Service Provide(SP) without using the VCs.
SP takes the charge of routing data for organizations.

11. Cost effective
Easy
Management

12. Address
Overlapping
Data Leakage

13. It is the new technology of VPN with high performance
 MPLS (Multi-Protocol Label Switching) was originally
designed to improve the store-and-forward speed of routers.
 It requires two or more sites for connection via same ISP

14. It directs data from one network node to the next based on
short path labels rather than long network addresses
It solves all the previous problems that were in overlay VPN
and peer to peer VPN.

15.  To avoid address overlapping MPLS used RD with private
data space to make it VPNv4.
 This VPNv4 send by company’s CE to PE.
Most companies used same PE so PE used VRF to
maintains each company route separately.
 When information send from source PE to destination PE
RT and VPN labels also send.

16. Two types of labels: top and bottom label
Top label is used to forward information from source PE to
destination PE.
When information send from source PE to destination PE
RT and VPN labels also send.
Bottom label is used by destination PE that information is
send to which CE.

18. CE sends routing
information of
company to PE.
PE receives
routing
information
Routing
information
combines with
RD of VRF to
form VPNv4
RT and labels
also send to
destination PE
Destination PE
injects VPN rout
to correct VRF
according to its
RT

19. CE sends
packet to
source PE.
Compares IP
address of
packet with
correct VRF
PE sticks both
labels on
packet.
Top label
forwards it to P-
router and
bottom label to
destination PE
P-router
forwards
packet
according to
top label
Destination PE
checks packet
VPN label and
sends to correct
CE

20. High
Efficiency
Data
sending
isolation
Avoid
Address
Overlapping
Managed
Easily
Cost
Effective

21. Through compassion between both VPNs we see that MPLS
VPN is much more better than traditional VPN due to its
high efficiency, cost effective, easy management and data
security. So MPLS VPN is a cost effective and secure solution
for company customer to correct different sites around the
world.

22. http://ieeexplore.ieee.org/ Engineering Analysis
and Research of MPLS VPN