VPN is an acronym for Virtual Private Network which is an emulation of private & secured network over a shared infrastructure like internet or a separate internet backbone. An IP VPN service offers exclusive & private inter connectivity using internet protocol to computers or local area networks (LANs). Business companies cal extend their LAN and computers at various locations across the country, thereby enabling online communication with most cost effective way.

MPLS stands for "Multi Protocol Label Switching", which provides a mechanism for engineering network traffic patterns that is independent of  routing tables. MPLS assigns short labels to IP packets that describe how to forward them through the network in a faster way.

Features

IP VPN Network of BSNL covers cities such as Kolkata, Lucknow, Delhi, Ahmedabad, Mumbai, Pune, Bangalore, Ernakulam, Hyderabad and Chennai. All the state capitals are also connected to VPN forming Virtual connectivity covering 1000 cities (71 Physical Nodes) in India. At present there will be 3 types of services offered such as Gold, Silver and best effort. For the bulk customers there is provision of discounts.

•   IP VPN Networkis an Intranet with no connectivity to Internet or others.

•   The connectivity between nodes are STM-16 (2.488 Gbps) and STM-1 (155Mbps).

•   All the nodes are connected to two or more nodes forming back up link   and  redundancy.

•   IP VPN provides logical MESH topology for all the nodes.

•   The links form  the part of National SDH rings providing high reliability.

•   Network Operating Centres (NOC) are at Bangalore and Pune

•   PSTN/ISDN dial up MPLS VPN service (for existing VPN customers only) has also been launched.   (PSTN access code 127233 and ISDN access code 127225).

                                                                     BSNL VPN Core Network

Advantages of IP VPN

•   Low cost & Less Complexity of private networks i.e. the overall cost of   availing a VPN service
    decreases as the number of sites in a particular   VPN   increases.
•   Flexible & Scalable i.e. easily up-gradable to meet any type of customer's  requirement.
•   Provides different class of services and SLA (Service Level Agreement).
•   Provides range of value added services like Bandwidth on demand, VIDEO conferencing, Voice
    over IP, etc.
•   Highly reliable and secured since it is an Internet employing MPLS   technology.
•   PSTN / ISDN dial up VPN may be used as a backup service or for mobility across the country.

The service will be economical for the corporates, business firms, etc. which are having networking across the countries preferably in cities covered by the IP VPN networks of BSNL. The service will provide secured, reliable economical means of establishing networks. There are 3 types of services offered to suit the customer need.

•   It provides diversified range of services such as layer 2, layer 3, and  dial-up VPNs.
•   Scalable and flexible to facilitate large scale deployment
•   Reliable service with SLA support
•   Capable of meeting quality of service and security
•   Provides cutting edge technology
•   Fully managed service to customers
•   There will be over all reduction of network element costs, media cost for IP VPN options
•   Covers at present 1000 cities in India (All state capitals, Pune and   Ernakulam)

 Availability of Service

(a)     Tariff of Dial Up VPN service  :-                                                                                  

The number of dial-in users may be initially restricted to 5 (Five) for all the above packages.
For more than five dial in users, additional 5% of the account charges in 250, 500 and       
1000 hours packages may be charged for every additional 5 (Five) users or part thereof .