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Juniper networks design models

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To enhance scalability further, use a modular design approach. Begin with a set of standard, global building blocks. From there, design a scalable network that meets business requirements. For instance, in an enterprise network, we might start with a core module and then connect an Internet edge module and a WAN module to build the complete network. Many of these modules are the same for service design. This provides consistency and ease of scalability in that you can use the same modules in multiple areas of the network to maintain the network.

These modules follow standard layered network design models and use separation to ensure that interfaces between the modules are well defined. A key to maintaining a highly available network is building in the appropriate redundancy to guard against failure, whether it is link or circuit, port, card, or chassis failure.

This redundancy is carefully balanced, however, with the complexity inherent in redundant systems. Overly complex redundancy features can cause more problems than they prevent by introducing failures. While all organizations require redundancy, you need to avoid making the redundancy too complex and reliant on too many other modules.

The failure of a single component can cause a network failure. With the addition of a significant amount of delay-sensitive and drop-sensitive traffic such as voice and videoconferencing, we also place a strong emphasis on resiliency in the form of convergence and recovery timing.

Choosing a design that features failure detection while reducing recovery time is important to ensuring the network stays available in the face of even a minor component failure.

Network security is another important factor in designing the architecture. As networks become larger and more complex, there are more entry points and areas where security vulnerabilities exist. Effective WAN aggregation and enterprise WAN designs ensure a secure network that does not restrict usability for the end user, hindering the customer experience in the process. The security design should address vulnerability and risk while enhancing the user experience as much as possible.

Ideally, you would use a single pane of glass in the form of a network management application, or a collection of applications, to implement, maintain, and troubleshoot the network. Old methods of using CLI and truck rolls to manage the network become more of a burden as the complexity of the network grows and as it becomes more vital to the user experience. An architecture that focuses on making the network easy to manage includes all of the elements found in FCAPS, an ISO model and framework for network management.

Fault management by a central system that polls network elements via SNMP to verify status while network events are sent to the network management system via SNMP traps. Configuration management via third-party tools that manage and execute scripts, or through GUI-based systems that allow bulk changes throughout the network. When you have multiple business units with discreet billing and service requirements, you need to tie usage to those accounts. Performance management lets the organization verify that service-level agreements are met, either between the enterprise and the service provider, or between the enterprise IT organization and the business units internal SLAs.

Security management is essential to the network. The ability to coordinate security throughout the enterprise and at the service points where security policy is applied is crucial to securing the network.

Beyond the configuration of security, the management system should support the reporting of security events so policies can be evaluated and changed to meet evolving security threats. An effective management system provides a complete FCAPS functionality and enhances the management, security, and accountability of the underlying network design.

As enterprise bandwidth grows so does the WAN size and complexity. However, the complexity associated with managing such infrastructure does not have to increase proportionally thanks in part to automation tools. Automation of network operations is less error prone and therefore avoids outages while reducing the CAPEX. A future-proofed network is designed to stream telemetry, not just provide visibility. It can also extend analytics to provide actionable insights with further extensibility to self-driving networks by self-discovery, self-monitoring, self-configuring and self-healing.

The aggregated Ethernet interfaces are optional—a single link between devices is typically used— but can be deployed to increase bandwidth and provide link level redundancy. We cover both options. We chose EBGP as the routing protocol in the underlay network for its dependability and scalability.

Each device is assigned its own autonomous system with a unique autonomous system number to support EBGP. You can use other routing protocols in the underlay network; the usage of those protocols is beyond the scope of this document. Starting in Junos OS Releases Micro Bidirectional Forwarding Detection BFD —the ability to run BFD on individual links in an aggregated Ethernet interface—can also be enabled in this building block to quickly detect link failures on any member links in aggregated Ethernet bundles that connect devices.

Setting up the underlay in a collapsed spine fabric model: Collapsed Spine Fabric Design and Implementation. Because many networks implement a dual stack environment for workloads that includes IPv4 and IPv6 protocols, this blueprint provides support for both protocols. Steps to configure the fabric to support IPv4 and IPv6 workloads are interwoven throughout this guide to allow you to pick one or both of these protocols.

A network virtualization overlay is a virtual network that is transported over an IP underlay network. A tenant is a user community such as a business unit, department, workgroup, or application that contains groups of endpoints. Groups may communicate with other groups in the same tenancy, and tenants may communicate with other tenants if permitted by network policies.

A group is typically expressed as a subnet VLAN that can communicate with other devices in the same subnet, and reach external groups and endpoints by way of a virtual routing and forwarding VRF instance.

As seen in the overlay example shown in Figure 3 , Ethernet bridging tables represented by triangles handle tenant bridged frames and IP routing tables represented by squares process routed packets. Ethernet and IP tables are directed into virtual networks represented by colored lines. Tunneled packets are de-encapsulated at the remote VTEP devices and forwarded to the remote end systems by way of the respective bridging or routing tables of the egress VTEP device.

IBGP for Overlays. Centrally Routed Bridging Overlay. Edge-Routed Bridging Overlay. Figure 4 shows that the spine and leaf devices use their loopback addresses for peering in a single autonomous system.

In this design, the spine devices act as a route reflector cluster and the leaf devices are route reflector clients. As a result, the leaf devices peer only with the spine devices and the spine devices peer with both spine devices and leaf devices.

Because the spine devices are connected to all the leaf devices, the spine devices can relay IBGP information between the indirectly peered leaf device neighbors. You can place route reflectors almost anywhere in the network.

However, you must consider the following:. Does the selected device have enough memory and processing power to handle the additional workload required by a route reflector? In this design, the route reflector cluster is placed at the spine layer. The QFX switches that you can use as a spine in this reference design have ample processing speed to handle route reflector client traffic in the network virtualization overlay.

Starting in Junos OS Release The workload can be IPv4 or IPv6. Most of the elements you configure in the supported reference architecture overlay designs are independent of whether the underlay and overlay infrastructure uses IPv4 or IPv6. The corresponding configuration procedures for each of the supported overlay designs call out any configuration differences if the underlay and overlay uses the IPv6 Fabric design. The first overlay service type described in this guide is a bridged overlay , as shown in Figure 5.

As a result, the spine devices provide only basic underlay and overlay connectivity for the leaf devices, and do not perform routing or gateway services seen with other overlay methods. Leaf devices originate VTEPs to connect to the other leaf devices. The tunnels enable the leaf devices to send VLAN traffic to other leaf devices and Ethernet-connected end systems in the data center.

Otherwise, you can select one of the other overlay types that incorporate routing such as an edge-routed bridging overlay , a centrally-routed bridging overlay , or a routed overlay. For information on implementing a bridged overlay, see Bridged Overlay Design and Implementation. The second overlay service type is the centrally routed bridging overlay , as shown in Figure 6.

In a centrally routed bridging overlay routing occurs at a central gateway of the data center network the spine layer in this example rather than at the VTEP device where the end systems are connected the leaf layer in this example. You can use this overlay model when you need routed traffic to go through a centralized gateway or when your edge VTEP devices lack the required routing capabilities.

An integrated routing and bridging IRB interface at each spine device helps route traffic between the Ethernet virtual networks. This Ethernet service model is ideal for overlay networks that require scalability beyond a single default instance.

Support for this option is available currently on the QFX line of switches. This Ethernet service model is ideal for overlay networks that require scalability beyond a single default instance, and where you want more options to ensure VLAN isolation or interconnection among different tenants in the same fabric. The third overlay service option is the edge-routed bridging overlay , as shown in Figure 7.

For a list of switches that we support as leaf devices in an edge-routed bridging overlay, see Data Center Fabric Reference Design Supported Hardware Summary.

This model allows for a simpler overall network. The spine devices are configured to handle only IP traffic, which removes the need to extend the bridging overlays to the spine devices. This option also enables faster server-to-server, intra-data center traffic also known as east-west traffic where the end systems are connected to the same leaf device VTEP. As a result, routing happens much closer to the end systems than with centrally routed bridging overlays.

For information on implementing the edge-routed bridging overlay, see Edge-Routed Bridging Overlay Design and Implementation. The overlay network in a collapsed spine architecture is similar to an edge-routed bridging overlay. In a collapsed spine architecture, the leaf device functions are collapsed onto the spine devices. Because there is no leaf layer, you configure the VTEPS and IRB interfaces on the spine devices, which are at the edge of the overlay network like the leaf devices in an edge-routed bridging model.

The spine devices can also perform border gateway functions to route north-south traffic, or extend Layer 2 traffic across data center locations. The configuration of IRB interfaces in centrally routed bridging and edge-routed bridging overlays requires an understanding of the models for the default gateway IP and MAC address configuration of IRB interfaces as follows:.

This model also allows you to configure a routing protocol on the IRB interface. The virtual gateway should be the same for all default gateway IRB interfaces in the overlay subnet and is active on all gateway IRB interfaces where it is configured.

In addition to the benefits of the previous model, the virtual gateway simplifies default gateway configuration on end systems. The downside of this model is the same as the previous model. We recommend this model for edge-routed bridging overlays. A benefit of this model is that only a single IP address is required per subnet for default gateway IRB interface addressing, which simplifies default gateway configuration on end systems.

The final overlay option is a routed overlay , as shown in Figure 8. This option is an IP-routed virtual network service. Cloud providers prefer this virtual network option because most modern applications are optimized for IP.

For information on implementing a routed overlay, see Routed Overlay Design and Implementation. See Figure 9. For example:. The reference network virtualization overlay configuration examples in this guide include steps to configure the overlay using MAC-VRF instances.

You configure an EVPN routing instance of type mac-vrf , and set a route distinguisher and a route target in the instance. See the reference configurations in the following topics:. When you configure shared tunnels, the device minimizes the number of next-hop entries to reach remote VTEPs.

You globally enable shared VXLAN tunnels on the device using the shared-tunnels statement at the [edit forwarding-options evpn-vxlan] hierarchy level. This setting requires you to reboot the device. Ethernet-connected multihoming allows Ethernet-connected end systems to connect into the Ethernet overlay network over a single-homed link to one VTEP device or over multiple links multihomed to different VTEP devices.

Ethernet traffic is load-balanced across the fabric between VTEPs on leaf devices that connect to the same end system. We tested setups where an Ethernet-connected end system was connected to a single leaf device or multihomed to 2 or 3 leaf devices to prove traffic is properly handled in multihomed setups with more than two leaf VTEP devices; in practice, an Ethernet-connected end system can be multihomed to a large number of leaf VTEP devices.

All links are active and network traffic can be load balanced over all of the multihomed links. VLAN trunking ensures that virtual machines VMs on non-overlay hypervisors can operate in any overlay networking context.

IP-connected multihoming endpoint systems to connect to the IP network over multiple IP-based access interfaces on different leaf devices. We tested setups where an IP—connected end system was connected to a single leaf or multihomed to 2 or 3 leaf devices. The setup validated that traffic is properly handled when multihomed to multiple leaf devices; in practice, an IP-connected end system can be multihomed to a large number of leaf devices.

In multihomed setups, all links are active and network traffic is forwarded and received over all multihomed links. IP traffic is load balanced across the multihomed links using a simple hashing algorithm. EBGP is used to exchange routing information between the IP-connected endpoint system and the connected leaf devices to ensure the route or routes to the endpoint systems are shared with all spine and leaf devices. Some of our reference designs include border devices that provide connections to the following devices, which are external to the local IP fabric:.

The consolidation of multiple services onto one physical device is known as service chaining. If your network includes legacy appliances or servers that require a 1-Gbps Ethernet connection to a border device, we recommend using a QFX or a QFX switch as the border device.

To provide the additional functionality described above, Juniper Networks supports deploying a border device in the following ways:. As a device that serves as a border device only. In this dedicated role, you can configure the device to handle one or more of the tasks described above. For this situation, the device is typically deployed as a border leaf, which is connected to a spine device.

As a device that has two roles—a network underlay device and a border device that can handle one or more of the tasks described above. For this situation, a spine device usually handles the two roles.

Therefore, the border device functionality is referred to as a border spine. For example, in the edge-routed bridging overlay shown in Figure 15 , border spines S1 and S2 function as lean spine devices. The data center interconnect DCI building block provides the technology needed to send traffic between data centers.

Routes are exchanged between spine devices in different data centers to allow for the passing of traffic between data centers.

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Cummins diesel engine sale In light of jetworks drive, support for DHCP to handle both residential and business subscribers is essential. Usually, this differentiation is achieved through an exchange between the broadband junioer gateway BNG and the RADIUS server to authenticate and enable services dynamically per subscriber. As shown juniper networks design models Figure 7this solution reference architecture depicts a virtual chassis access block and one separated aggregation block consisting of EX, EX, and EX devices. This method of linking multiple network functions can be thought of as physical service chaining. A more efficient model for service carefirst regional traditional is to virtualize and consolidate network functions onto a single device. The resulting tree topology provides a single active Layer 2 data path between any two endpoints.
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