I N D E M @ I I I T A

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It is well known fact that IT resources can be optimally utilised over a network either wired or wireless. Thus IIITA has also established a reliable network of over 2000 nodes that is functional round the clock. STAR topology has been followed in cabling and pure structured cables connect all the nodes and servers. Gigabit backbone runs over single mode optiocal fiber cables of 6/12/24 cores for main and redundant uplinking. The IIITA campus LAN has been divided into several VLANs (virtual LAN) and CISCO 4000 series switch serves as central switch as well as router for these VLANs running on local B class IP pools. Total 12 OFC interfaces have been configured as gateway with first IP address in the designated pool to each VLAN. 24 Gigabit ethernet ports of this central switch have been configured as a single subnet for servers only. Access and security policy has been enforced on this Layer-3 switch to maintain computing law and order over IIITA Intranet.

The IIITA network is one of the best Networks in the country providing variety of services to the 2000 nodes connected to the Network. Some of the salient features are as:
  • 2 x 2 Mbps Leased Line subscribed from BSNL for Internet activities.
  • 1 x 1 Mbps Leased Line subscribed from ERNET for R n D activities.
  • 50+ Enterprise Servers provide various services on the Network.
  • One 8 TB NAS installed for hosting mail boxes of 2000 users.
  • One 8 TB IP-SAS installed for hosting profiles of 2000 users.
  • Major services include: WWW, Mail, Proxy, Firewall, DNS, LDAP, Profile, Storage, WINS, Forums, Database etc.
  • Two Computer Centers with 30 labs provide computer facility to the students.
  • 5 UPS of 100KVA each provide uninterrupted power supply to the network.
  • The network consists of number of VLANs which are interconnected with 24 core optical fiber.
The physical setup of IIITA consists of two computer centres namely CC-1 and CC-2 respectively, the administrative building, library, lecture theatre (LT), girls' hostels, boys' hostels, faculty residences, visitors hostels etc. The heart of LAN, server room is located in the Lecture Theater.

The server room is the most important area of the LAN. It is the place from where links are distributed to all the buildings. Links between the server room and other buildings are single mode optical fibres. Each of these fibres starts from a layer-3 switch (CISCO 4000) inside the server room and terminates over a layer-2 (CISCO 2950) switch in the respective building.

Because the server-room switch is connected to all other buildings, and it is the most important node for communication between two buildings, it is called backbone switch. The terminal switch in buildings is used to distribute the LAN connectivity to all hosts in that building. It is therefore called the distribution switch.

The backbone switch is a Cisco box, a model called Catalyst 4600. It runs version 12.1 of the Internetwork Operating System (IOS).On the switch, there are thirteen modules installed. Twelve of these are optical fibre termination points. Other module is an Ethernet switch having 24 100/1000 Mbps ports which connect the rest of the segments local to server room to the backbone switch.

Distribution switches in buildings have been configured on Cisco 2950 switches. These switches have 24 100/1000 Mbps Ethernet ports and two module to terminate optical fibre.
The backbone switch is a Layer-3 switch, whereas the distribution switch works on Layer-2.

The ethernet module on the backbone switch is used to connect the rest of the servers to the LAN. Thus in the server room, the backbone itself acts as a distribution switch. Servers and other systems within the server room are directly connected to the Ethernet ports on the backbone. The server room has a capacity of about 100 servers with both LAN and WAN interfaces.

Just as in server room, the segments of network have also a large number of nodes inside them and the distribution switches have been isntalled at each lab to distribute the connectivity.
Internet service to IIITA has been provided by Bharat Sanchar Nigam Limited (BSNL). BSNL has leased two lines to the Institute. A leased line is a copper cable laid from the nearest telephone exchange to the campus which is in the campus along with server room. Therefore a 20 meter copper cable terminates Internet line at routers. This line is exclusively used for Internet trafic. BSNL has provided 2-Mbps bandwidth over each of these lines, with a commit ratio of 1:4. This means that IIITA would receive a speed of maximum 2 Mbps and a minimum speed of 500 Kbps, which is 1/4 of the maximum, over each line.

There is a D-link 2630 series router with running version 1.3.1C of the 2630 series operating system. Its job is to act as a gateway between BSNL and the internal LAN. It transmits all the Internet traffic to and from the internal hosts.

How Stuff Works