THE SOUTHERN MOSCOW BACKBONE

Nikolai N.Repin
ISF
Moscow
E-mail: repin@ips.ac.msk.su


The purpose of this paper is to describe the Southern Moscow Backbone (SMB) project which is designed to create a high-speed communication network uniting leading Moscow scientific and educational organizations. To implement the project, ISF has purchased the 8-wire fiber-optic communication line. The Southern Moscow Backbone is intended to become the core of the ensuing all-Russian research and educational computer network.

1. Introduction

The purpose of this paper is to describe the Southern Moscow Backbone (SMB) project which is designed to create a high-speed communication network uniting leading Moscow scientific and educational organizations. SMB is to be constructed by laying a fiber-optic communication line along the following route: MSU - RAS Building - Zelinsky Institute - Lebedev Institute - Steklov Institute - ITEP - CEMI/Medical Library - Space Research Institute - ISF Office (Fig. 1). The total length of the fiber optic line will be 28,8 km.

[Fig 2]
                                Fig.1

    1. MSU;                     5. Steklov Institute;       9. ISF Office;
    2. RAS Building;            6. ITEP;                    10. M9 Phone Exchange.
	3. Zelinsky Institute; 		7. CEMI;
	4. Lebedev Institute; 		8. Space Research Institute;

2. The topology of the Backbone

To implement the project, ISF has purchased the fiber-optic communication line build by NPP "R" along this route. The line was constructed using a single-mode 8-fiber cable OKMZKG-10-2-0.7-8/0 with the average value of attenuation 0.7 db/km.

The connection scheme of separate fibers of the backbone is shown in Fig. 2. This scheme allows for a certain flexibility in choosing possible connections of the backbone nodes among themselves.

[Fig 1]
                                Fig. 2.

The total length of 28.8 km will include:

SMB will use the TCP/IP (Transmission Control Protocol/Internet Protocol) as its transport protocol, which de facto is a standard for scientific data communication networks. The purpose of the Southern Moscow Backbone is to provide the Russian scientific community with an access to resources of the international computer network INTERNET. Consequently, only IP-system of network is planned to be supported. Other architectures (like X.25, IPX, NJE, DECnet) won't be considered in the early stages functioning of the backbone line.

To ensure sufficient capacity and reliability of the backbone, it is proposed to realized TCP/IP protocols on the base of the FDDI (Fiber Distribute Data Interface) technology in its DAS (Dual Attached Stations) version. The backbone's capacity will then run as high as 100 Mbps. Particular reliability of a FDDI line results from the fact that the overall connectivity of the backbone is then independent of the condition of its individual nodes.

The technology described above calls for the nodal points of the backbone to be connected with a double fiber-optic ring. The facilities of the layed cable will make this possible using approximately a quarter of its resource. Figure 3 presents the resulting logical structure of the FDDI ring.

[Fig 3]
                                Fig. 3.

Connection of new individual user-organizations to the network and the future development of the backbone's infrastructure itself are to be achieved by using such facilities as additional fiber-optic and radio relay lines, radio-modem connections, and terrestrial digital and analog lines.

3. Hardware complex of the FDDI ring node

The core of the fiber optic line node is the CISCO-4000 router installed in the 19" cabinet with the following configuration:

    Cisco 4000 chassis              CISCO 4000-M
    Additional 28 MB                MEM-NP32M
    Main Memory (Total 32 MB)
    Ethernet 2 ports Module         NP-2E
    Serial 4 High Speed Module          NP-4T
    FDDI 1 port dual                NP-1F-D-SS
    attached  single mode
    male DTE interface              CAB-V35MT

In addition, each organization which supports a backbone access point, will receive in the framework of the project one router CISCO-516CS which make it posible to connect up to 16 organizations using terrestrial analog telephone lines. It allows us to connect several hundreds of scientific and educational organizations and thousands of users to the international networks in a short period of time.

4. The Backbone routing policy.

The routing system of SMB should be designed so that all the members of Russian scientific and educational communitys connected to the backbone, from individuals to scientific object-oriented networks and noncommercial public networks, would be given equal access to the resources of both the backbone itself and the INTERNET international network.

The Southern Moscow Backbone is intended to become the core of the ensuing all-Russian research and educational computer network. In this connection, its routing policy should be sufficiently flexible, so as to make feasible interaction with regional segments of the evolving network. It is the connection to Moscow that is envisioned as the main external data channel for most of the country's regions. Therefore, special attention must be given to international data channels that connect the Southern Moscow Backbone to West-European and American research computer networks. These channels are supposed to satisfy the needs of both the organizations and institutions in Moscow and Moscow region connected to the backbone and those in remote regions of Russia if they are linked to SMB by means of inter regional channels, as well.

In order to have a number of external international channels interacting with the Southern Moscow Backbone, it is necessary to use the dynamic routing based on the BGP-4 protocol, or to use the routing policy on the base of "bridging" technology.

The present routing scheme for the backbone line is oriented to these two international data-transfer channels:

However, additional negotiations with the agencies that finance these channels are necessary to conclusively ascertain their legal status and accessibility to the entire scientific community.

The routing relations with internal commercial networks will be determined by separate internetwork agreements that should be worked out in negotiations with each particular internal network. The general strategy of these negotiations primarily implies the maximum coverage of the entire scientific, cultural, and educational communities with the INTERNET network services on the most favorable financial conditions both at the present time and in the future.

Before it's placed in operation and in the initial stage of its functioning, the Southern Moscow Backbone is supposed to have a purely noncommercial status and to be exploited in the interests of science, culture, and education.


Back to Index