Prepare, Plan, Design, Implement, Operate, and Optimize Phases CCNP Training in Gurgaon

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Cisco has formalized a network's life cycle into six phases: Prepare, Plan, Design, Implement, Operate, and Optimize. These phases are collectively known as PPDIOO. The PPDIOO life cycle provides four main benefits:

• It lowers the total cost of ownership by validating technology requirements and planning for infrastructure changes and resource requirements.
• It increases network availability by producing a sound network design and validating the network operation.
• It improves business agility by establishing business requirements and technology strategies.
• It speeds access to applications and services by improving availability, reliability, security, scalability, and performance.

Figure 1-2 shows the PPDIOO network life cycle.

Figure 1-2. Cisco PPDIOO Network Life Cycle

The following sections discuss these phases in detail.

Prepare Phase

The Prepare phase establishes organization and business requirements, develops a network strategy, and proposes a high-level architecture to support the strategy. Technologies that support the architecture are identified. This phase creates a business case to establish a financial justification for a network strategy.

Plan Phase

The Plan phase identifies the network requirements by characterizing and assessing the network, performing a gap analysis against best-practice architectures, and looking at the operational environment. A project plan is developed to manage the tasks, responsible parties, milestones, and resources to do the design and implementation. This project plan is followed during all phases of the cycle.

Design Phase

The network design is developed based on the technical and business requirements obtained from the previous phases. The network design provides high availability, reliability, security, scalability, and performance. The design includes network diagrams and an equipment list. The project plan is updated with more granular information for implementation. After the Design phase is approved, the Implement phase begins.

Implement Phase

New equipment is installed and configured in the Implement phase. New devices replace or augment the existing infrastructure. The project plan is followed during this phase. Planned network changes should be communicated in change control meetings, with necessary approvals to proceed. Each step in the implementation should includes a description, detailed implementation guidelines, estimated time to implement, rollback steps in case of a failure, and any additional reference information. As changes are implemented they are also tested before moving to the Operate phase.

Operate Phase

The Operate phase maintains the network's day-to-day operational health. Operations include managing and monitoring network components, routing maintenance, managing upgrades, managing performance, and identifying and correcting network faults. This phase is the design's final test. During operation, network management stations should monitor the network's general health and generate traps when certain thresholds are reached.

Optimize Phase

The Optimize phase involves proactive network management by identifying and resolving issues before they affect the network. The Optimize phase may create a modified network design if too many network problems arise, to improve performance issues, or to resolve application issues. The requirement for a modified network design leads to the network life cycle beginning.

Design Methodology Under PPDIOO

The following sections focus on a design methodology for the first three phases of the PPDIOO methodology. This design methodology has three steps:

Step 1.	Identify network requirements.
Step 2.	Characterize the existing network.
Step 3.	Design the network topology and solutions.

In step 1, decision makers identify requirements, and a conceptual architecture is proposed. This step occurs in the PPDIOO Prepare phase.

In step 2, the network is assessed, and a gap analysis is performed to determine the infrastructure necessary to meet the requirements. The network is assessed on function, performance, and quality. This step occurs in the PPDIOO Plan phase.

In step 3, the network topology is designed to meet the requirements and close the network gaps identified in the previous steps. A detailed design document is prepared during this phase. Design solutions include network infrastructure, Voice over IP (VoIP), content networking, and intelligent network services. This set occurs in the PPDIOO Design phase.