Documenting the Design

A design document lists the design requirements, documents the existing network and the network design, identifies the proof-of-concept strategy and results, and details the implementation plan.

The final design document structure should be similar to the one in Figure 2-26, which includes the following:

■ Introduction: Every design document should include an introduction to present the main reasons leading to the network design or redesign.

■ Design requirements: Also a mandatory part of any design document, this section includes the organization's requirements and design goals that must be fulfilled.

■ Existing network infrastructure: This section is required only for a network redesign. The subsections document the results of the existing network characterization steps.

■ Design: This section is an essential part of the design document and identifies the design and implementation details. The design details documented will obviously differ depending on the type of design project (whether it is a completely new network, a network redesign, or simply a new service introduction, for example), but they typically include the topology, addressing, and design. Implementation details, such as configuration templates and exact configurations of network devices, are included to ease the implementation process.

■ Proof of concept: This section describes the pilot or prototype network verification and test results.

■ Implementation plan: This section provides the implementation details that technical staff need to carry out as quickly and smoothly as possible, without requiring the presence of the designer.

■ Appendixes: The appendixes usually include lists and, optionally, configurations of existing network devices.

Figure 2-26 Sample Design Document

Design Document Index CISCO

1. Introduction

2. Design Requirements

3. Existing Network Infrastructure

3.1. Network topology

3.2. Network audit

3.3. Applications used in the network

3.4. Network health analysis

3.5. Recommended changes to the existing network

4. Design

4.1. Design summary

4.2. Design details

4.2.1. Topology design

4.2.2. Addressing design

4.2.3. EIGRP design

4.2.4. Security design

4.3. Implementation details

4.3.1. Configuration templates for campus devices

4.3.2. Configuration templates for WAN devices

5. Proof of Concept

5.1. Pilot or prototype network

5.2. Test results

6. Implementation Plan

6.1. Summary

6.2. Implementation steps

Appendix A—List of existing network devices

Appendix B—Configurations of existing network devices

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