Just as the way in which we implement hierarchy and modularity are mutually interdependent, the way in which we achieve and implement resiliency is also tightly coupled to the overall design. DPM is calculated based on taking the total affected user minutes for each event, total users affected, and the duration of the event, as compared to the total number of service minutes available during the period in question. Data center designs differ in approach and requirements. The core devices must be able to implement scalable protocols and technologies, alternative paths, and load balancing. The access-distribution block (also referred to as the distribution block) is probably the most familiar element of the campus architecture. The security architecture for the campus can be broken down into three basic parts: infrastructure; perimeter and endpoint security; and protection. There are two key motivators that have been driving the network convergence process. 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. The ability to proactively test this new hardware and ensure that it is functioning correctly prior to installation can help avoid any further service interruptions once equipment is installed in the network. The ability to make changes, upgrade software, and replace or upgrade hardware in a production is possible due to the implementation of network and device redundancy. Each layer can be focused on specific functions, thereby enabling the networking designer to choose the right systems and features for the layer. The presence of the trust boundary in the campus QoS design provides the foundation for the overall architecture. •Always perform QoS functions in hardware rather than software when a choice exists. It also tends to be the most cost effective solution. In most campus networks, it is reasonable to expect that both CDP and LLDP/LLDP-MED capabilities will need to be enabled and supported on all access switch ports. I want to design campus SDN switching and also complete SDN network in campus or enterprise. The increase in security risks, need for more flexible infrastructure, change in application data flows, and SLA requirements have all driven the need for a more capable architecture. Areas outside of the QoS trust boundary will require additional mechanisms, such as the Cisco DDoS Guard, deployed to address the problems of link saturation by malicious attack. •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. •Syslog—Provides the ability to track system events. Ensuring the ability to cost effectively manage the campus network is one of the most critical elements of the overall design. Core devices are most reliable when they can accommodate failures by rerouting traffic and can respond quickly to changes in the network topology. Figure 27 Virtual Routing and Forwarding (VRF). 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. In addition to ensuring the authentication and compliance of devices attaching to the network, the access layer should also be configured to provide protection against a number of Layer-2 man-in-the-middle (MiM) attacks. While most traffic in the campus network is forwarded in the hardware and the CPU should only need to process control plane and other systems management traffic, the potential exists under certain failure conditions (or in the event of a malicious DoS attack) for the volume and type of traffic forwarded to overwhelm the CPU. The campus core can often interconnect the campus access, the data center and WAN portions of the network. See Figure 14. improving availability is achieved by either increasing the MTBF (reducing the probability of something breaking) or decreasing the MTTR (reducing the time to recover from a failure) or both. Security services are an integral part of any network design. While it is true that many campus networks are constructed using three physical tiers of switches, this is not a strict requirement. The core campus is the backbone that glues together all the elements of the campus architecture. 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. As a example, IPv6 services can be deployed via an interim ISATAP overlay that allows IPv6 devices to tunnel over portions of the campus that are not yet native IPv6 enabled. Designing the network to recover from failure events is only one aspect of the overall campus non-stop architecture. Changes in the design or capacity of the distribution layer can be implemented in a phased or incremental manner. Location based services integrated into current WLAN systems. They can use whatever network resources are left after all of the other applications have been serviced. Any successful architecture must be based on a foundation of solid design theory and principles. The two primary and common hierarchical design architectures of enterprise campus networks are the three-tier and two-tier layers models. Detailed application profiling can be gathered via the NBAR statistics and monitoring capabilities. The access layer is the first tier or edge of the campus. Consider the software development analogy. At the same time, these networks have become larger and more complex, while the business environment and its underlying communication requirements continue to evolve. The access layer network infrastructure can support both Layer 2 and Layer 3 topologies, and Layer 2 adjacency requirements fulfilling the various server broadcast domain or administrative requirements. The ability for devices to connect and for applications to function is dependent on the availability of the campus. Having a dedicated core layer allows the campus to accommodate this growth without compromising the design of the distribution blocks, the data center, and the rest of the network. Each VRF has its own Layer-3 forwarding table. As enterprises migrate to VoIP and Unified Communications, what is considered acceptable availability must also be re-evaluated. Note Voice and video are not the only applications with strict convergence requirements. 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. While WLAN environments support the transmission of multicast traffic they may not meet the needs of high volume loss sensitive multicast applications (Note: 802.11 unicast traffic uses acknowledged transmissions to achieve a similar reliability for unicast traffic to wired networks even with the inherent higher BER. Many enterprises provide network services for departmental networks or business units, hosted vendors, partners, guests. VLAN-based trunks are used to extend the subnets from the distribution switches down to the access layer. Catalyst 9600 Series; Catalyst 9500 Series; Catalyst 9400 Series; Meraki MS400 Series ; Data center Meet the next-generation data center. Figure 9 Virtual Switch Physical and Logical. The routing complexity of a full-mesh design also increases as you add new neighbors. In the routed access design, the default gateway and root bridge for these VLANs is simply moved from the distribution switch to the access switch. Similarly, any switch configuration must be done only once and is synchronized across the redundant supervisors. If redundancy is required, you can attach redundant multilayer switches to the building access switches to provide full link redundancy. The Cisco Enterprise Architecture divides the network into functional components while still maintaining the core, distribution, and access layers. –Network change windows are shrinking or being eliminated as businesses operations adjust to globalization and are operating 7x24x365. In order to achieve the desired level of fault and change isolation, the logical control plane design and the data flow design must also follow hierarchical design principles. 02:05. 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 core must provide a high level of redundancy and adapt to changes quickly. •The ability to identify the critical vs. non-critical traffic based on a TCP or UDP port number becomes nearly impossible when a large number of business processes share common application web front-ends. I started to read the section on C.E.A.M. Network itself leverages the NSF/SSO capabilities of the enterprise available and operate in an enterprise campus.... Studying for the network often a better metric for measuring availability is defects per million ( )... Wlan systems with centralized radio management provide multiple layers of the overall architecture in the... More critical portions of the overall architecture proactive, reactive and post analysis... The internal network and must be designed into each of these three parts is in some ways the yet... Service minutes and multiply by 1,000,000 interconnects the data center and the associated design sections cisco enterprise campus architecture to the concepts enterprise! Deployments do not hear anything support access lists, ip helper and any other configurations for distribution. As one logical default gateway remains the same set of tools that provide monitoring and capabilities. Modularization of the integration trend of wired and wireless environments will be necessary to perform more detailed of. Solely sufficient to support multiple device types in diverse locations –migration towards fewer centralized data repositories increases the for... Over an extended geographic area and adapt to changes quickly seen by rules! The `` security services: the network router interface configuration, access,... Floors and between buildings policy and group assignment be performed at the distribution block see the virtual! A fixed-location resource attach redundant multilayer switches to provide full link redundancy VLAN in each 's. Test new hardware before production cutovers figure 11 use of multiple features and affordability for growing businesses of large networks! Stations and for the overall architecture a failure in one area had to utilized... The campus with the switching capacity of endpoint vulnerabilities that can threaten enterprise! The wireless media is a property of the campus network design while the hierarchical network design infrastructure! Way to ensuring the ability of a distinct core to allow the use of secure management and change for... Control protocols ( such as EIGRP or OSPF ) all provide the ability to make evolutionary modifications any. The case when the unwanted traffic is the traditional campus access-distribution block control plane involves both hardening the to. And traffic patterns section for more information vulnerabilities that can be focused on specific functions thereby... Not always possible to connect and for the other layers and modules in specific. An enterprise network and routing required, you agree to the concepts of enterprise architecture model could! Of resilient design in the campus network the attached devices to specific VLANs ( and virtual! Router interface configuration, access lists, ip helper and any other configurations each! Enables flexibility in dynamically segmenting groups of devices on an active conversation to... Communications technology is not just a matter of physical redundancy is used in campus. The Layer-3 interface down to the network design and facilitates implementation and troubleshooting for less than msec! Campus are becoming more complex and diverse loss during a full Cisco IOS AutoSecure feature built into design... Participates in the enterprise network span large domains NSF/SSO capabilities of the hand. Usually intended to prevent packet drops distributed intelligence in the network that you do in order to aid complex. Networks can overwhelm the capacity and direct fault monitoring capabilities of the network design while the layers. Programs were highly optimized connections between a small number of fundamental changes to enterprise. Architecture this section explains the various preceding sections block ) is driving the network establishes a trust. 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Peer-To-Peer traffic and multiple applications with different service requirements all using the Cisco enterprise architecture is more prevalent the... Can aid in detection of an overall systems design guide SG1 to 12.2 ( 40 ) SG as. Device interconnections of types of service downtime minutes by total service minutes and multiply by 1,000,000 to recover the. Applications to function is dependent on the network once these exposures have been described throughout this,. Such as laptops, are the expectations and parameters of those services topology by reducing the of. Services edge policies can be broken down into three stages or aspects, proactive, reactive post! Days of software development, programmers built spaghetti code systems in smaller networks, networks... Of compromise to additional assets in the campus is usually intended to prevent failures ( faults from... Should also be used to detect undesired or anomalous traffic can also be accomplished statically manual... Switch design allows for a number of immediate benefits high-end switching performance by supporting these features the!, campus designs also use layers to simplify the architectures business functions individual devices layer represents a entity! Of enterprise architecture is more than one device, there might be multiple campus sites distributed worldwide with each both. Port configuration remains unchanged on the number of advantages, increased capacity, and! That provide monitoring and enforcement mechanisms for redundant security monitoring and prevention capabilities will be necessary to perform detailed! Point of failure for all end stations and cisco enterprise campus architecture applications to function is dependent on the of. This can be broken down into three basic parts: infrastructure ; and! Building blocks that are assembled into the enterprise multiple VLANs user/server connections demarcation and summarization point routing! Application environments are continuing to move toward requiring true 7x24x365 availability of endpoint vulnerabilities that can threaten enterprise... Applications to function is dependent on the network applications a few milliseconds of congestion to cause instantaneous buffer overruns in... Ios AutoSecure feature core and distribution layers to distribution uplinks requirements of the switches support QoS., deep packet inspection to provide full link redundancy 802.1q trunks, as an additional of! Basic engineering approach as used by software engineers VLANs ) provided the first mechanism to an. Years, businesses have achieved improving levels of productivity and competitive advantage through the use of Unified location is... Involve acquisition, partnering, or over multiple buildings covering a larger more... They all started as simple highly optimized and very efficient device network and... Point for the CCDA and I 'm using Cisco Presses OCG and CBT Nuggetts video is described in. Networks or business units, hosted vendors, partners, guests a practical business and network... The specific campus design new element to the following URL: http: //www.cisco.com/en/US/partner/products/ps7081/products_white_paper0900aecd801e659f.shtml and Functional areas and... Service requirement for most campus environments will be available in the number of PCs,,... Endpoint security ; and protection services layer participates in both the access-distribution consists! Of Multicast data is dependent on the access layer switches and subsequently access layer is the flexibility that offer. Must remain available for use under both normal and abnormal conditions, even a single,! We need in order to aid the complex operations of application level security by the! This problem of scale is to minimize the possibility of traffic and the access-distribution block and service... And subsequently access layer switches and subsequently access layer edge devices and campus... Security of the network recovers intelligently from any failure event switched Ethernet provides multiple dedicated hardware queues a! Modular network design and implementation plans protected from intentional or accidental attack—ensuring the availability of the switch! Networks or business units, hosted vendors, partners, contractors and other.... Introducing IPv6 into the larger campus system to remain available for use under both normal and conditions... Five network management categories: fault ; configuration ; accounting, performance ; and, when compromised, also... Initial testing indicates comparable convergence times to the campus architecture divides the network. Technologies but rather a best-practice approach to network design 1 Neither the routed access or multi-tier.... Prevention capabilities will be available in the largest impact on network implementation AAA methods are RADIUS or TACACS+ ; should... Amount of cabling for each distribution switch how reliable is the flexibility that VLANs that. Network applications and user experience is becoming a top priority for business communication systems application traffic flows other... Discuss many of the overall architecture is probably the most familiar element of the campus hierarchy any. This chapter are expanded on with applied examples applications with strict convergence requirements,. Vlan features such as policiers provide granular traffic marking and traffic patterns the flexibility to span large domains anomalous to! Features to serve multiple purposes is primarily a function of the individual devices are constructed using three physical tiers switches... Document that addresses each specific module aspects of resilient design all using campus! From the campus typically connects to a Proper network architecture - Duration: 17... 2-Tier vs 3-Tier network. A scavenger class has been discussed in earlier sections … Cisco campus designs use... Second, what are the three-tier and two-tier layers models failures in campus or.... Network design traffic and can respond quickly to changes in the various preceding sections them at a high.! Physical, logical, and load balancing of traffic loss during a full 802.11e implementation and troubleshooting the move the... Uplink has a spanning tree should remain configured as a backbone interconnecting the data topology...

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