Creating a Draft Design Document

After thoroughly examining the existing network, the designer creates a draft design document. Figure 2-17 illustrates a draft design document's index (not yet fully developed), including the section that describes the existing network. The "Design Requirements" and "Existing Network Infrastructure" chapters of the design document are closely related—examining the existing network can result in changes to the design requirements. Data from both chapters directly influences the network's design.

Figure 2-17 Draft Design Document Index

Immediate Feedback

Draft Design Document •(|(>i|ia 1. Design Requirements CISCO.

>-2. Existing Network Infrastructure-*-

f 2.1. Network Topology

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Network Audit Traffic Analysis

Immediate Feedback

Network Audit Traffic Analysis

Analysis

2.2. Network Audit <, 2.3. Applications Used in the

Analysis

2.2. Network Audit <, 2.3. Applications Used in the

Network „ 2.4. Network Health Analysis

Analysis and recommendations

Appendix A—List of Existing

Network Devices Appendix B—Configurations of Existing Network Devices the requirements of the design

Network „ 2.4. Network Health Analysis

Analysis and recommendations

Appendix A—List of Existing

Network Devices Appendix B—Configurations of Existing Network Devices the requirements of the design

Typical draft documentation for an existing network should include the following items:

■ Logical (Layer 3) topology map or maps. Divide the topology into network modules if the network is too large to fit into one topology map.

■ Physical (Layer 1) topology map or maps.

■ The network audit results, including the types of traffic in the network, the traffic congestion points, the suboptimal traffic paths, and so on.

■ A summary section describing the major network services used in the existing network, such as Open Shortest Path First (OSPF), Border Gateway Protocol (BGP), and Internet Protocol Security (IPsec).

■ A summary description of applications and overlay services used in the network.

■ A summary description of issues that might affect the design or the established design requirements.

■ A list of existing network devices, with the platform and software versions.

■ Configurations of existing network devices, usually attached as either a separate document or an appendix to the design document.

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