Cisco has developed its own design life cycle consisting of three phases.
1. Plan phase consists of a) Strategy and Analysis, Assessment, and Design.
2. Build phase consists of Validation, Deployment, and Migration.
3. Manage phase consists of Product Support, Solution Support, Optimization, and Operations Management.
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Prepare, Plan, Design, Implement, Operate, and Optimize. In short, this is known as PPDIOO.
The PPDIOO life cycle provides the following benefits:
Operate phase includes
The Optimize phase involves proactive network management by doing the following:
The tasks involved in various phases of PPDIOO are as given below:
a. Plan: Establishes an organization's requirements, develops a network strategy, and proposes a high-level conceptual architecture. Identifies the network requirements by characterizing and assessing the network, performing a gap analysis
b. Prepare: Identifies the network requirements based on goals, facilities, and user needs. Establishes organization and business requirements, develops a network strategy, and proposes a high-level architecture
c. Design: It includes preparation of network diagrams and an equipment list. Provides high availability, reliability, security, scalability, and performance
d. Implement: New equipment is installed and configured, according to design specifications. Installation and configuration of new equipment
e. Operate: Maintains the network's day-to-day operational health. Day-to-day network operations
f. Optimize: Proactive network management by identifying and resolving issues before they affect the network
The design phase consists of planning for implementation also. Therefore, you need to procure the equipment, and implement the network (or update the network, as the case may be) according to the plan.
The Implement phase relates to implement new devices, including verifying and testing.
Determining organization's requirements occurs in the Prepare phase, which identifies requirements and builds a conceptual architecture.
Characterizing the existing network belongs to the Plan phase this step is performed to determine the infrastructure necessary to meet the requirements.
In the "Create a modified network design if too many network problems arise" step, the network would have already been implemented. This step is related to the Optimize Phase (last of the Cisco's 6-step network life-cycle) of the PPDIOO process.
By incorporating the organization's requirements, the top-down network design process provide the big picture that meets current and future requirements. The main advantage of the bottom to top design is that it uses previous experience and faster. The main disadvantage of top to bottom design process is that it is more time consuming.
The top-down approach begins with the organization's requirements before looking at technologies. Network designs are tested using a pilot or prototype network before moving into the Implement phase.
Bottom-up design process has the benefits of quick response times to design requests, it's based on previous experience, and less time consuming. This approach may fail to take care of all the organizational requirements.
When analyzing an existing network, you may need to look at the existing documentation to start with. If no documentation exists or if you find insufficient data, you may need to use networking tools to identify the devices and protocols used.
The steps required in order are given below:
The following are the technical constraints that you may need to consider when identifying network requirements at a client's business: