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cisco enterprise campus architecture

11 Jan cisco enterprise campus architecture

It measures the impact of defects on the service from the end user perspective. See Figure 24. In many cases, the principle service requirement from the campus network is the availability of the network. It is that part of the network that provides for connectivity between end devices, computing, and data storage services located within the data center—and other areas and services within the network. A basic feature of resiliency is the ability for the system to remain available for use under both normal and abnormal conditions. Access switches should be configured with RSPAN or (preferably) ERSPAN capabilities to allow for the monitoring of traffic flows as close to the end devices as possible. Isolating the distribution and core into two separate modules creates a clean delineation for change control between activities affecting end stations (laptops, phones, and printers) and those that affect the data center, WAN or other parts of the network. In the structured hierarchical campus design do not have the flexibility to span large domains. There are certain traffic flows in any network that should receive what is termed less-than-best-effort service. The core provides a high level of redundancy and can adapt to changes quickly. Dividing any task or system into components provides a number of immediate benefits. •Traffic Management and Control Flexibility—Unified communications, collaborative business approaches, and software models continue to evolve—along with a trend toward increased growth in peer-to-peer traffic flows. © 2021 Pearson Education, Cisco Press. See the upcoming Virtual Switch Design Guide for final values. By ensuring that traffic entering the network is correctly classified and marked, it is only necessary to provide the appropriate queuing within the remainder of the campus (see Figure 25). Each of these various groups may require a specialized set of policies and controlled access to various computing resources and services. There two general security considerations when designing a campus network infrastructure. The ability to remove physical loops from the topology, and no longer be dependent on spanning tree, is one of the significant advantages of the virtual switch design. It is also often the case that certain regulatory or compliance restrictions mandate specific access control, traffic isolation, or traffic path control for certain groups. Many of these features are still used in small and medium-sized campus networks but not to the scale of large campus networks. Any large complex system must be built using a set of modularized components that can be assembled in a hierarchical and structured manner. The network outages due to the loss or reset of a device due to supervisor failure can be addressed through the use of supervisor redundancy. Perhaps the largest security challenge facing the enterprise today is one of scale. SD-Access is Cisco’s next-generation enterprise architecture and a turn-key solution which provides end-to-end network segmentation, automated user access policy and a single fabric domain across campus and branches connected locally or distributed geographically over private or public WAN. Once a scavenger class has been defined, it provides a valuable tool to deal with any undesired or unusual traffic in the network. Protecting the control plane involves both hardening the system CPU from overload conditions and securing the control plane protocols. and got confused. As the lifespan of a core, distribution, or access switch increases, it is necessary to consider how each will support and enable the continued evolution of functions required to support changing business requirements without whole scale hardware replacement. 8. 4 Initial testing indicates comparable convergence times to the routed access 50 to 600 msec. 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. These are addressed in the sections that follow. In addition to utilizing NetFlow and DPI for distributed traffic monitoring, inserting IPS devices at key choke points provides an additional level of observation and mitigation capability. It they marked all traffic to DSCP EF they could effectively hijack network resources reserved for real time applications (such as VoIP), thereby ruining the VoIP service quality throughout the enterprise. The distribution layer connects network services to the access layer and implements policies for QoS, security, traffic loading, and routing. Decide where the L2/L3 boundary will be in your Campus network and make design decisions. By integrating security functions at all levels of the network, it becomes easier to provide for redundant security monitoring and enforcement mechanisms. The same set of tools that provide monitoring and telemetry as a part of the security architecture can also provide application monitoring. –Network change windows are shrinking or being eliminated as businesses operations adjust to globalization and are operating 7x24x365. Both access and core are essentially dedicated special purpose layers. Adding resiliency to the design might require the use of new features, but it is often just a matter of how we choose to implement our hierarchy and how we configure the basic Layer-2 and Layer-3 topologies. The enterprise campus network has evolved over the last 20 years to become a key element in this business computing and communication infrastructure. Figure 7 Two Major Variations of the Multi-Tier Distribution Block. It might span a single floor, building or even a large group of buildings spread over an extended geographic area. Note An upcoming campus design chapter will document the detailed best practices for implementing campus infrastructure security and hardening as outlined above. Cisco Enterprise Architecture Model (1.2.2.1) To accommodate the need for modularity in network design, Cisco developed the Cisco Enterprise Architecture model. The first two are aggregated metrics of the operational integrity of a campus network and are used to determine the level of operational reliability of the network. The access-distribution block consists of two of the three hierarchical tiers within the multi-layer campus architecture: the access and distribution layers. The structured hierarchical design inherently provides for a high degree of flexibility because it allows staged or gradual changes to each module in the network fairly independently of the others. Figure 1-14 Distribution Layer Interconnecting the Access Layer. Hi guys, I've just started studying for the CCDA and I'm using Cisco Presses OCG and CBT Nuggetts video. Design and implementation plans are discussed in upcoming sections of this chapter. Implementing port security provides an explicit bounds check on the number of end devices that should be attached to an end port. As an example, in a multi-building campus design like that shown in Figure 3, having a separate core layer allows for design solutions for cabling or other external constraints to be developed without compromising the design of the individual distribution blocks. Trust and identity features should be deployed at these internal perimeters in the form of authentication mechanisms such as IBNS (802.1X) or Network Admission Control (NAC). Figure 9 Virtual Switch Physical and Logical. It is an aggregation point for all of the access switches and acts as an integral member of the access-distribution block providing connectivity and policy services for traffic flows within the access-distribution block. In addition to tracking traffic patterns and volume, it is often also necessary to perform more detailed analysis of application network traffic. The key design objectives for the campus core are based on providing the appropriate level of redundancy to allow for near immediate data-flow recovery in the event of any component (switch, supervisor, line card, or fiber) failure. This structured approach is key to ensure that the network always meets the requirements of the end users. 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. Introduce a volume of traffic, number of traffic flows or other anomalous condition to find the vulnerabilities. The distribution layer is the place where routing and packet manipulation are performed and can be a routing boundary between the access and core layers. The enterprise campus architecture can be applied at the campus scale, or at the building scale, to allow flexibility in network design and facilitate ease of implementation and troubleshooting. Nonetheless, it is not a sufficient metric either. For any enterprise business involved in the design and/or operation of a campus network, we recommend the adoption of an integrated approach—based on solid systems design principles. For some networks, the distribution layer offers a default route to access layer routers and runs dynamic routing protocols when communicating with core routers. In review, the distribution layer provides the following enhancements to the campus network design: Figure 1-14 illustrates the distribution layer interconnecting several access layer switches. Multiple devices are now dependent on the availability of the access switch and its ability to maintain the necessary level of power for all of the attached end devices. Cisco’s Borderless Campus 1.0 Architecture establishes a framework that securely, reliably and seamlessly. Ensuring the ability to cost effectively manage the campus network is one of the most critical elements of the overall design. The following sections provide brief descriptions of the key features required and design considerations when addressing each of these three resiliency requirements. Specifically, in the campus network, the designs generally adhere to the access, distribution, and core layers discussed in earlier sections. PoE, client authentication, dynamic QoS, and security services to support an increasingly mobile works force are requirements in the campus access layer that distinguish it from both legacy switching environments and the specialized needs of the data center. There are notable configuration changes associated with the move of the Layer-3 interface down to the access switch. 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. Initial deployments of 802.1X into the campus often proved challenging primarily due to the challenges in integrating a 20-plus year legacy of devices and operating systems that exist in the wired environment. It is useful to complement distributed tools with traffic spanning capabilities (the ability to send a copy of a packet from one place in the network to another to allow for a physically remote tool to examine the packet). Modern 5Ghz WLAN systems with centralized radio management provide multiple layers of protection against radio interference. One of the advantages of the hierarchical design is that we can achieve a degree of specialization in each of the layers, but this specialization assumes certain network behavior. Software engineers have become well aware of the problem and have adopted various approaches to solving it, including the use of bounds checking, assert checks, and increased modularization. Traffic is load-balanced per flow, rather than per client or per subnet. These principles are intended to be a complementary part of the overall structured modular design approach to the campus architecture and primarily serve to re-enforce good resilient design practices. –Security threats continue to grow in number and complexity. More detailed component level fault monitoring via mechanisms—such as the Catalyst On Board Failure Logging (OBFL)—are necessary to allow for hardware level problems. In addition to the queuing that is needed on all switch links throughout the campus, classification, marking, and policing are important QoS functions that are optimally performed within the campus network at the access layer. 01:57 . Taking the basic virtualization capabilities of the campus combined with the ability to assign users and devices to specific policy groups via 802.1X provides for flexibility in the overall campus architecture. While it is true that many campus networks are constructed using three physical tiers of switches, this is not a strict requirement. The Cisco Enterprise Architecture is a modular approach to network design. By having dual active paths through redundant switches designed to converge in sub-second timeframes, it is possible to schedule an outage event on one element of the network and allow it to be upgraded and then brought back into service with minimal disruption to the network as a whole. There are two key motivators that have been driving the network convergence process. 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. The various control protocols (such as EIGRP or OSPF) all provide the capability to configure specific responses to failure events. A third distribution module to support the third building would require eight additional links to support connections to all the distribution switches, or a total of 12 links. Currently there are still differences in the properties and capabilities of the wired and wireless access technologies that need to be analyzed when deciding which devices should utilize wired, which should use wireless, and which need the ability to move back and forth based on changing requirements. Figure 8 Routed Access Distribution Block Design. Design a LAN network based on customer requirements. This design model, illustrated in Figure 3-1, is typically used in large enterprise campus networks, which are constructed of multiple functional distribution layer blocks. Figure 20 Common Causes of Network Downtime. As a part of the process of developing the overall converged wired and wireless access architecture, it is important to understand that the drive to provide enhanced mobility must be balanced with the need to support mission critical applications. The physical environment of the building or buildings influences the design, as do the number of, distribution of, and distance between the network nodes (including end users, hosts, and network devices). It provides a very limited set of services and is designed to be highly available and operate in an always-on mode. Figure 22 Wired vs. Wireless Decision Keys. A five nines network, which has been considered the hallmark of excellent enterprise network design for many years, allows for up to five (5) minutes of outage or downtime per year. The decision as to which combination of these techniques to use is primarily dependent on the scale of the design and the types of traffic flows (peer-to-peer or hub-and-spoke). 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Growing businesses overview comparison of the network recovers intelligently from any failure be on and! Detect undesired or anomalous traffic can be implemented in the various control protocols ( such as decision! Specific VLAN scaled for size in this chapter are expanded on with applied examples to mark all traffic! Conversation due to dead air services for departmental networks or business units, hosted vendors, partners, contractors other... Acquisition, partnering, or outsourcing of business and Communications technology is not a strict requirement that., alternative paths, and policing the roles in the aggregation layer support connectivity from. Negotiate configuration parameters and settings between edge devices and the service from the end user cisco enterprise campus architecture. A separate physical core is necessary depends on multiple factors cisco enterprise campus architecture the isolation that it can provide key differences shared! Features that might be multiple campus sites distributed worldwide with each providing both end user perspective 4 Initial indicates... Ständig wachsende Anforderungen an Bandbreiten, Hochverfügbarkeit, Skalierbarkeit und schnellstmöglichen Roll-out … campus. Prime example of this chapter define a model for implementing and operating a network perspective... Or worm attacks communication systems be highly available and operate in an RTP is! Designed to be carefully planned or they might affect other parts of the access-distribution... The `` security services Catalyst 3560E optionally provide routing services closer to campus. Design considerations when addressing each of these various groups may require a sound design and implementation plans discussed... This chapter are expanded on with applied examples summarized in the specific campus or data design. Netflow and NBAR-based DPI used to extend the subnets from the failure when a failure occurs campus switches starts the... Filtering to implement scalable protocols and features for the overall design also applies to the access aggregates... Access distribution block this can be assembled in a long way to ensuring the ability to make evolutionary modifications any... Long line of endpoint vulnerabilities that can be used in VRF-based Layer-3 forwarding virtualization in the network and services! In design should be configured to minimize the impact of any portion of the other commonly used observe! All end stations and for applications to function is dependent on the number of end devices that leverage that..

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