Enterprise Campus 3. Architecture: Overview and Framework. Table Of Contents. Enterprise Campus 3. Architecture: Overview and Framework.

Contents. Enterprise Campus Architecture and Design Introduction. Audience. Document Objectives. Introduction. The Enterprise Campus.

Campus Architecture and Design Principles. Hierarchy. Access. Distribution. Core. Mapping the Control and Data Plane to the Physical Hierarchy. Modularity. Access- Distribution Block.

Services Block. Resiliency. Flexibility. Campus Services.

Non- Stop High Availability. Measuring Availability. Unified Communications Requirements. Tools and Approaches for Campus High Availability.

Access and Mobility Services. Converged Wired and Wireless Campus Design. Campus Access Services.

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Application Optimization and Protection Services. Principles of Campus Qo. S Design. Network Resiliency and Qo. SVirtualization Services. Campus Virtualization Mechanisms. Network Virtualization.

Security Services. Infrastructure Security. Perimeter Access Control and Edge Security. Endpoint Security.

Enterprise Campus 3.0 Architecture: Overview and Framework. Free Configuring DFS Study Guide for Microsoft's 70-411 certification exam.

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Distributed Security—Defense in Depth. Operational and Management Services. Fault Management. Accounting and Performance Configuration and Security. Evolution of the Campus Architecture Enterprise Campus 3. Architecture: Overview and Framework Note This document is the first part of an overall systems design guide.

This document will become Chapter 1 of the overall design guide when the remaining chapters are completed. It is also intended to serve as a guide to direct readers to more specific campus design best practices and configuration examples for each of the specific design options. The enterprise campus network has evolved over the last 2. The interrelated evolution of business and communications technology is not slowing and the environment is currently undergoing another stage of that evolution.

The emerging Human Network, as it has been termed by the media, illustrates a significant shift in the perception of and the requirements and demands on the campus network. The Human Network is collaborative, interactive and focused on the real- time communications of the end- user, whoever that user may be a worker, a customer, a partner, anyone. The user experience on the network has become the critical determinant of success or failure of technology systems, whether in private or professional lives. An increased desire for mobility, the drive for heightened security, and the need to accurately identify and segment users, devices and networks are all being driven by the changes in the way businesses partner and work with other organizations. The list of requirements and challenges that the current generation of campus networks must address is highly diverse and includes the following: . It introduces the key architectural components and services that are necessary to deploy a highly available, secure, and service- rich campus network. It also defines a reference design framework that provides the context for each of the specific design chapters—helping the network engineer understand how specific design topics fit into the overall architecture.

It might span a single floor, building or even a large group of buildings spread over an extended geographic area. Some networks will have a single campus that also acts as the core or backbone of the network and provide interconnectivity between other portions of the overall network. The campus core can often interconnect the campus access, the data center and WAN portions of the network. In the largest enterprises, there might be multiple campus sites distributed worldwide with each providing both end user access and local backbone connectivity. From a technical or network engineering perspective, the concept of a campus has also been understood to mean the high- speed Layer- 2 and Layer- 3 Ethernet switching portions of the network outside of the data center. While all of these definitions or concepts of what a campus network is are still valid, they no longer completely describe the set of capabilities and services that comprise the campus network today. These include the packet- transport services (both wired and wireless), traffic identification and control (security and application optimization), traffic monitoring and management, and overall systems management and provisioning.

These basic functions are implemented in such a way as to provide and directly support the higher- level services provided by the IT organization for use by the end user community. These functions include: .

Before we look at the six services in more detail, it is useful to understand the major design criteria and design principles that shape the enterprise campus architecture. The design can be viewed from many aspects starting from the physical wiring plant, moving up through the design of the campus topology, and eventually addressing the implementation of the campus services.

The order or manner in which all of these things are tied together to form a cohesive whole is determined by the use of a baseline set of design principles which, when applied correctly, provide for a solid foundation and a framework in which the upper layer services can be efficiently deployed. Designing a campus network is no different than designing any large, complex system—such as a piece of software or even something as sophisticated as the space shuttle. The use of a guiding set of fundamental engineering principles serves to ensure that the campus design provides for the balance of availability, security, flexibility, and manageability required to meet current and future business and technological needs. The remainder of this campus design overview and related documents will leverage a common set of engineering and architectural principles: hierarchy, modularity, resiliency; and flexibility. Each of these principles is summarized in the brief sections that follow: .

The successful design and implementation of an enterprise campus network requires an understanding of how each applies to the overall design and how each principle fits in the context of the others. A structured system is based on two complementary principles: hierarchy and modularity. Any large complex system must be built using a set of modularized components that can be assembled in a hierarchical and structured manner.

Dividing any task or system into components provides a number of immediate benefits. Each of the components or modules can be designed with some independence from the overall design and all modules can be operated as semi- independent elements providing for overall higher system availability—as well as for simpler management and operations. Computer programmers have leveraged this principle of hierarchy and modularity for many years.

In the early days of software development, programmers built spaghetti code systems. These early programs were highly optimized and very efficient. As the programs became larger and they had to be modified or changed, software designers very quickly learned that the lack of isolation between various parts of the program or system meant that any small change could not be made without affecting the entire system. Early LAN- based computer networks were often developed following a similar approach. They all started as simple highly optimized connections between a small number of PCs, printers, and servers.

As these LANs grew and became interconnected—forming the first generation of campus networks—the same challenges faced by the software developers became apparent to the network engineers. Update Computer Group Membership Without Logging Off Yahoo. Problems in one area of the network very often impacted the entire network. Simple add and move changes in one area had to be carefully planned or they might affect other parts of the network. Similarly, a failure in one part of the campus quite often affected the entire campus network.

Each individual function or software module was written in such a way that it could be changed without having to change the entire program all at once.