Presentation on theme: "Architecting the Network"— Presentation transcript:
1 Architecting the Network Geoff HustonNetwork Technical ManagerTelstraISOC Workshop
2 Architecture and Design Definition of Architectural PrinciplesTranslating Architecture into a DesignGenerating an Engineering PlanImplementing the NetworkOperational ConsiderationsPolicy Considerations
3 Personal Experience The Australian Internet - AARNet Constructed in May 1990Initially 45 client sites (to 450)Modest implementation budget(initially $US 1.2M)Modest initial staff resources (2)June 95: $10M p.a. with 5 staff
4 Personal Experience Telstra Internet purchased AARNet operations and customer basecommenced July 95telco National Internet Backbone and providerJune 97: $80M p.a. carriage business
5 Architectural Principles Assumption:Implementation of Public Infrastructure on a National ScopeDesign issues will vary for commercial and/or corporate networks
6 Architectural Principles SimplicityFunctional AdequacyAffordabilityImplementable todayDesigned to meet actual end client requirementsUses (and develops) local expertise
7 Architectural Principles Simplicity is the key attribute of any network architectureDiverse, complex and uncoordinated architectures result in very high implementation and operational costs, and are resistant to subsequent incremental engineering.
8 Architectural Principles Functional adequacy means doing what is requiredbut NOT doing what is unnecessary or what is not neededMaintin focus on solving the objectives of the network’s service goals
9 Architectural Principles Affordability means keeping the network within the bounds of available fundingIf you can’t pay for it you’ll never be allowed to build it!Start small and allow for incremental growth
10 Architectural Principles Implementable means using components which are seen to work wellDon’t build a production network using experimental hardware and software!
11 Architectural Principles Create a service which solves your client’s actual needsTry not to solve artificial requirements!
12 Architectural Principles Be inclusive with involvementA national network will need the efforts of many individuals to make it happenAllow folk to get involved, and share the responsibility of making it happen
13 Network Design Considerations Design objective is to minimise costs and maximise capabilityUnless you are a telco bandwidth lease will dominate all other cost elementseven then it will probably dominate all other costs!The unit cost of bandwidth is the major design parameter
14 Network Design Considerations Implementation and operational costNetwork performanceOperational reliabilityManageabilityExtensibility
15 Network Design Strategy Affordable capacity defines delivered service qualitySolve today's problems firstDefine a service which matches current needs before matching future expectations
16 Network Design Components Internet Transport Service CoreLeased circuitsRoutersRouting Design