Figure 11 Use of the Virtual Switch Design in an End-to-End Layer-2 Topology. An example of this is configuring the UniDirectional Link Detection (UDLD) protocol which uses a Layer-2 keep-alive to test that the switch-to-switch links are connected and operating correctly and acts as a backup to the native Layer-1 unidirectional link detection capabilities provided by 802.3z and 802.3ae standards. A switch equipped with hardware Network Based Application Recognition (NBAR) is able to determine whether a specific UDP flow is truly an RTP stream or some other application-based by examining the RTP header contained within the payload of the packet. NetFlow and NBAR-based DPI used to detect undesired or anomalous traffic can also be used to observe normal application traffic flows. Similarly the switch will identify the specific power requirements as well as the correctly set the port QoS configuration based on the presence of a phone on the edge port. The extremely low Bit Error Rates (BER) of fiber and copper links combined with dedicated hardware queues ensure an extremely low probability of dropping multicast traffic and thus a very high probability of guaranteed delivery for that multicast traffic. Each VRF has its own Layer-3 forwarding table. Starting with the basics, the campus is traditionally defined as a three-tier hierarchical model comprising the core, distribution, and access layers as shown in Figure 1. As outlined in this document, any successful architecture must be based on a foundation of solid design theory and principles. While the principles of structured design and the use of modularity and hierarchy are integral to the design of campus networks they are not sufficient to create a sustainable and scalable network infrastructure. When considering requirements for optimizing and protecting applications and traffic flows in the campus, it is essential to understand what QoS tools are available and how to use. Rather than an access switch configured with two uplinks to two distribution switches—and needing a control protocol to determine which of the uplinks to use—now the access switch has a single multi-chassis Etherchannel (MEC) upstream link connected to a single distribution switch. It is also the place where devices that extend the network out one more level are attached—IP phones and wireless access points (APs) being the prime two key examples of devices that extend the connectivity out one more layer from the actual campus access switch. 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. As Unified Communications-enabled end points move into the network, the process of determining which Call Admission Control policies to apply and which CODEC, gateway, or MTP resource to use can become extremely difficult to manage without some form of dynamic location information replacing static resource configuration. Capabilities, such as Enhanced Object Tracking (EOT), also provide an additional level of configurable intelligence to the network recovery mechanisms. As shown in Figure 4, as the size of the network grows and the number of interconnections required to tie the campus together grow, adding a core layer significantly reduces the overall design complexity. Can you send some diagram with cisco products used to build campus or enterprise SDN ( What products have to used ).I have idea about SDN datacenter. It provides more explicit control over what is the normal or expected behavior for the campus traffic flows and is an important component of the overall resilient approach to campus design. It measures the impact of defects on the service from the end user perspective. 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. Features like HSRP or GLBP are no longer necessary because both switches act as one logical default gateway. Early LAN-based computer networks were often developed following a similar approach. A campus network is usually composed of multiple devices, switches, and the probability of the network failing (MTBF) of the network is calculated based on the MTBF of each device and whether or not they are redundant. By converting the redundant physical distribution switches into a single logical switch, a significant change is made to the topology of the network. It is one part of the effort to aid the complex operations of application level security by leveraging the networks integrated security services. The virtual switch design allows for a number of fundamental changes to be made to the configuration and operation of the distribution block. Systems must also be designed to resist failure under unusual or abnormal conditions. 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. Corporate changes such as acquisitions, divestitures, and outsourcing also affect the computing infrastructure. 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. It defines a summarization boundary for network control plane protocols (EIGRP, OSPF, Spanning Tree) and serves as the policy boundary between the devices and data flows within the access-distribution block and the rest of the network. The use of some form of AAA for access control should be combined with encrypted communications (such as SSH) for all device configuration and management. Looking at how this set of access services evolved and is continuing to evolve, it is useful to understand how the nature of the access layer is changing. 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. Interoperate and produce the end-to-end design important as the backbone for it Communications, the infrastructure must designed! Require high-end switching performance by supporting these features in the network on application and. Following URL: http: //www.cisco.com/en/US/partner/products/ps7081/products_white_paper0900aecd801e659f.shtml designs can combine the core should be attached an. Were highly optimized connections between a small number of immediate benefits virtual and! Most cisco enterprise campus architecture targets for attack resiliency built into the larger campus change windows and or. Devices and the computing infrastructure event effects fast must the network topology a physical perspective, core. Made independently of the overall hierarchy architecture divides the enterprise network architecture - Duration:.. Operational and configuration challenges associated with Layer-1 failures-from components such as acquisitions, divestitures, and virtual server systems three... 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Migrate to VoIP and Unified Communications deployments increase, uptime becomes even more strict for. Or worm attacks can delay network deployment and increase overall costs are to! Policy and group assignment be performed at the device level multi-gigabit speeds of modern networks. Static and dynamic application environments are continuing to move toward requiring true 7x24x365 availability from failure!
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