Day 5 :National Internet Backbone II - BSNL

                   NATIONAL INTERNET BACKBONE (NIB-I) 

1. Introduction 

National Internet Backbone has been conceived to provide Nation-wide connectivity to ISPs as well as customers. NIB consists of 550 nodes available at almost all the district headquarters. NIB is connected to VSNL Gateways at 6 locations i.e. Mumbai, Kolkata, New Delhi, Bangalore, Chennai and Ernakulam. 

2. Access Mechanisms

The NIB supports internet access with the following mechanisms. 

• PSTN Dial-up access to Internet, at port speeds up to 33.6 Kbps through access number 172233.

• ISDN Dial-up at Basic Rate Interface (BRI) through access number 172225. 

• Leased line access to Internet at 64 Kbps, N X 64 Kbps , 2 Mbps and N x 2 Mbps speeds

3. Equipments of NIB 

NIB consists of the following equipments

 3.1 Router : To route customer traffic to desired sites. 

3.2 Remote Access server : To give dialup access to the customer. 

3.3 LAN Switch : To interconnect Servers, Router and RAS. 

3.4 Server /Storage : For running various applications 

4. Help Desks and Call management

in NIB Primary function of NIB Helpdesk are given below : 

1. Customer care through defined management process. 

2. Technical help on Internet usage. 

3. Tariff and other commercial details are available on http://www.bsnl.co.in

 NATIONAL INTERNET BACKBONE (NIB-II) 

Project Overview

 The BSNL NIB2 network is primarily designed to be a high speed IP/MPLS network. The network is intended to be used for convergent services, integrating data, voice and video. It will provide services like Internet bandwidth for ISPs, Corporate, Institutions, Government bodies and retail users. The BSNL network is designed to be capable of meeting a wide range of customer requirements, including security, Quality of Service (QoS), and any-to-any connectivity. It is designed to be able to offer fully managed services to customers and allow BSNL to introduce additional services such as bandwidth on demand, etc. over the same network. The backbone infrastructure consists of an MPLS core with Internet services and VPN services edge networks. Cisco 12416 GSR & Cisco 12410 GSR routers are used to build the core network with the edge network consisting of Cisco 7613 routers. Cisco 7613 Routers serve also as the miscellaneous routers like Router Reflectors, International Data Center Routers, Internet Exchange Point Routers, IP Tax Routers, International Gateway Routers. 

Below are the services, which the network is designed to offer: 

i. L3 MPLS VPN services 

1. Intranet -Managed & Unmanaged 

2. Extranet – Managed & Unmanaged 

3. Internet Access services 

ii. Layer 2 MPLS VPN Services 

1. Ethernet over MPLS 

2. Frame relay over MPLS 

3. PPP over MPLS 

4. VPLS (Virtual Private LAN Service) 

5. Layer 2 Any-to-Any Interworking (except ATM)

 iii. Encryption services 

iv. Firewall Services 

v. NAT Services 

vi. Multicast Services 

NETWORK OVERVIEW

The BSNL NIB2 network is primarily designed to be a Carrier Grade high speed IP/MPLS network. The backbone infrastructure consists of an MPLS core with Internet services and VPN services edge networks. Cisco 12416 GSR & Cisco 12410 GSR routers are used to build the core network with the edge network consisting of Cisco 7613 routers. 

The NIB-2 Layer-1 core network (A1, A2 and A3) constitutes high speed Backbone (STM-16) that comprise of fully or partially meshed Core routers with built-in redundancies supporting MPLS protocol with link capacities in accordance with the traffic justification. Its function is primarily limited to high-speed packet forwarding between the core nodes. The five major nodes of Mumbai, Bangalore, Noida, Kolkatta and Chennai are the A1 nodes and are configured in full mesh with link bandwidths of STM-16. The Core routers at A2, A3 and A4 cities are dual homed to the nearest A core routers. The 9 nodes of Pune, Hyderabad Ahmedabad, Lucknow, Jullunder, Jaipur, Indore, Ernakulam and Patna are the A2 and A3 nodes and are configured in dual mesh with link bandwidths of STM-16. The Juniper based MPLS infrastructure at Chandigarh, Allahabad, Ranchi, Guwahati, Bhubaneshwar, Raipur, Vijayawada, Coimbatore, Mangalore, and Nagpur classify as A4 cities, which are dual homed to nearest A locations with link bandwidth of STM-1. 

The Layer-2 Edge network constitutes the second layer of the IP backbone network comprising of 71 cities consisting of MPLS “Provider Edge” routers (or “PE” routers) connected to the Core layer either locally through the Gigabit Ethernet switch or remotely through STM-1 links. The Edge network architecture provides for dual homing links from the Edge router to be terminated one each on the dual redundant Core routers to which the Edge router is parented. The NIB-II Edge nodes are classified into five categories according to their respective sizes. The A1 node represents the 5 core nodes of Noida, Mumbai, Bangalore, Chennai and Kolkatta. A2 represents nodes in the 3 cities of Pune, Hyderabad and Ahmedabad. A3 represents the 6 nodes in Ernakulam, Lucknow, Jaipur, Jullandhar, Indore and Patna. The B nodes (47 in total) are classified into 21 * B1 nodes du

 The function of this Edge layer is aggregation of customer traffic. This layer enforces QoS and other administrative policies. This layer provides customer access through three mechanisms, (a) Dialup (b) Dedicated Access and (c) Broadband Access. This layer provides connectivity to secure VPNs as well as to Internet Data Centers. The Interior gateway protocol used is OSPF and is based on a single Area model, which would offer a scalable, reliable, & redundant architecture, increasing efficiencies in the dynamics of the carrier grade IP Network of BSNL. 

Connectivity Details Each A1 location is fully meshed with other four A1s through STM-16 links, & will have A2 & A3 connected through STM-16 links and A4, B1 & B2 locations connected through STM-1 links

                        Provision of Internet and MPLS-VPN Services by BSNL 

1. Round the clock Maintenance of NIB Node (24 x 7) basis. 

2. Periodic monitoring and augmentation of National and International Bandwidth and dynamic distribution of traffic to ensure effective utilization of links 

3. Provision of Layer-3 MPLS VPN Services 

4. Provision of Layer-2 MPLS VPN Services

 5. Encryption services 

6. Multicast services 

7. Firewall Services 

8. Voice Over IP (VOIP) services 

9. Network Address Translation (NAT) services 

10. Provision of IP-VPN services 

11. Provision of Internet Leased lines and Dial-up internet connections 

12. Fault reporting and redressal for internet and VPN Links 

13. Guaranteed up time of circuits up to 99% in core network 

14. Ensuring minimum latency and delay in browsing ( less than one minute ) 

15. Maintaining Quality of Service. 

Multiprotocol Label Switching

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About Namdev Pratap

Namdev Pratap is Engineering student ,he is an active blogger and a Space enthusiast, He has Involved in many theoretical research in astronomy and space science,he has served as Volunteer for SETI Home for a period of 5 years in BOINC(Berkley Open Infrastructure for Network Computing).

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