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Hierarchical Design. Objectives Describe the benefits of using a hierarchical design model Identify the three layers that make up the hierarchical model.

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Presentation on theme: "Hierarchical Design. Objectives Describe the benefits of using a hierarchical design model Identify the three layers that make up the hierarchical model."— Presentation transcript:

1 Hierarchical Design

2 Objectives Describe the benefits of using a hierarchical design model Identify the three layers that make up the hierarchical model Describe the functions typically performed at each layer

3 Backbone Campus Backbone Building Local WorkgroupsRemote Workgroups Distribution Access Core Three-Layer Model Components

4 Site A Site B Site C Core-Layer Functions Optimized transport between remote sites – Redundant paths – Load sharing – Rapid convergence – Efficient use of bandwidth

5 Backbone Campus Backbone Building Distribution-Layer Functions Policy-based connectivity – Control access to services – Define path metrics – Control network advertisements

6 Backbone Building Access-Layer Functions Connect workgroups to backbones – Provide logical segmentation – Group users with common interests – Isolate broadcast traffic from the workgroup – Distribute services between multiple CPUs

7 Hierarchical model divide nodes into levels; intra-level nodes talk to each other mostly; level functional independent inter-level communications is summarised adv. : better control, scalability & modularity control - grouping ease network management scalability - traffic contained within region modularity -same cost/method for adding node adding new nodes won’t disturb other levels ; network can grow smoothly & uniformly

8 Hierarchical model (Cont.) disadv. : address administration overhead recommended for enterprise networks many hierarchical models exist Cisco network model core level :high speed transport for internetwork distribution level :implement management policy access level :connectivity to desktop PCs

9 Benefits of a Hierarchical Design Model Scalability Ease of implementation Ease of troubleshooting Predictability Protocol Support Manageability

10 Flat model every node is equal and talks to each other advantage is plug-and-play for small network disadvantage is lack of scalability due to excessive communications and CPU overhead may require a major upgrade at certain point if network continues to grow generally not recommended as an enterprise network architecture

11 Site A Site B Site C Core WAN One-Layer Design-Distributed

12 Central Site Remote Site Core WAN One-Layer Design-Hub and Spoke

13 Site A Campus Backbone Building A2Building A1 SiteBSite CCore WAN Two-Layer Design

14 Data Center Remote Site 1 Redundant Two-Layer Hierarchy Use for cost-effective LAN redundancy

15 Guidelines for effective deployment Do not mesh the network within a layer Do not place end stations on backbones Keep 80% of the traffic local to the workgroup Use network features at the appropriate layer

16 Logical topology logical topology may differ from physical choices depend on network protocols used : flat (L2 protocol) hierarchical (L3 protocol) flat logical structure : based on low cost switches; bridges are out plug-and-play; no address administration not scaleable; need to contain broadcast

17 Logical structure (Cont.) hierarchical logical structure : based on expensive routers or L3 switches need address administration scaleable; better control and manageability several logical structures can co-exist in a multiple protocol network


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