MARITIME TACTICAL WIDE AREA NETWORKING (MTWAN ...

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Uncontrolled copy when printedUNCLASSIFIEDACP 200(B) Vol 2CHAPTER 1NETWORK ARCHITECTUREINTRODUCTION101. Network architecture describes the logical structure and operating principles thatgovern a network. An MTWAN architecture, by necessity, has a flexible logical networkstructure capable of supporting heterogeneous computing in a Radio Frequency (RF)environment. This chapter expands upon the systems and technical concepts introduced inChapter 2.AIM102. This chapter describes proven network architectures suitable for supporting aMTWAN.OVERVIEW103. The term ‗network architecture‘ is commonly used to describe a set of abstractprinciples for the technical design of protocols and mechanisms for computer communication.The MTWAN Network Architecture (NA) represents a set of deliberate choices from a set ofdesign alternatives, where the choices are informed by an understanding of the requirementscanvassed in Chapter 2. In turn, this architecture provides a guide for the many technicaldecisions required to standardize network protocols, algorithms and schemas that appear in thesubsequent chapters. The purpose of the architecture is to provide coherence and consistencyto these decisions and to ensure that the requirements are met.104. A Network Architecture describes:DESCRIPTIONa. The overall geographic layout of the network;b. How it is connected to other networks;c. How computers will communicate with one another;d. How entities, such as computers and domains, are named;e. Where security boundaries are drawn and how they are enforced; andf. How management boundaries are drawn and selectively pierced.105. An MTWAN (Figure 1–1) comprises one or more Task Group Area Networks(TGANs) where a TGAN is a collection of mobile units such as ships and submarines. It may1-1UNCLASSIFIEDOriginal
Uncontrolled copy when printedUNCLASSIFIEDACP 200(B) Vol 2also include Maritime Marine Force (MMF) and Maritime Air Groups (MAG) as well asNetwork Operation Centers (NOCs).106. Within an MTWAN, connectivity between mobile units is via Radio Frequency (RF)communications (although NOC-to-NOC connectivity may be terrestrial).107. In terms of topology and routing protocols, an MTWAN is influenced by itsdistributed and low bandwidth, high latency environment. An important key to the MTWANrouting architecture (and any routing architecture) is the design and management ofAutonomous Systems.Allied WANNOC#11NOC#12NOC#21MobileRF CommunicationsMobileTGAN #2MobileMobileTGAN #1MTWANFigure 1-1 Notional MTWAN ArchitectureROUTING ARCHITECTURE (RA)AUTONOMOUS SYSTEMS (AS)108. An MTWAN comprises one or more AS. An AS is a collection of networks, or moreprecisely, the routers joining those networks that are under the same administrative authorityand that share a common routing strategy. An AS has a single ‗interior‘ routing protocol andpolicy, and is also sometimes referred to as a routing domain. Interior routing information isshared among routers within the AS, but not with systems outside the AS. However, an ASmay announce its internal networks to other AS that it is linked to. On the Internet, an AS isan Internet Service Provider (ISP), but universities, research institutes, and privateorganizations also usually have their own AS.1-2UNCLASSIFIEDOriginal
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