If we need additional information regarding your feedback, we will contact you at this email address. Toggle navigation Cisco Content Hub. Command Explorer. Topics Navigation. Recent Chapters. Top Viewed. Figure 1. They are also referred to as primary paths; other alternate next-hops are sometimes referred to as secondary paths.
Figure 2. Device show ip bgp Not advertised to any peer Refresh Epoch 1 Local Device show ip cef Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www. An account on Cisco. Table 1. Create a New Book. Select an Existing Book. Brandon Prebynski.
CiscoChampion Radio is a podcast series by Cisco Champions as technologists. Barry Morrison. The brief was to implement a Allison Park. Have you ever imagined what your car, phone, laptop, or anything you own for that matter, would say if it could speak? I think my phone would tell me to Figure 3 compares the median monthly recurring charges for MPLS VPN and two types of Internet service symmetrical business Internet and asymmetrical business broadband for a sample of major cities worldwide.
Packet delivery based on 15 years of ping data from Stanford ping end-to-end reporting PingER global server sample. Source: William Norton DrPeering. Business broadband is asymmetrical service and is offered in a wide range of data rates median data rates are 12 Mbps downstream and 1 Mbps upstream worldwide.
Broadband service is the lowest priced networking alternative and can be used for business with the right services for security, reliability and performance in place.
It offers an attractive price performance characteristic for branches in that they require higher downstream than upstream data rates. This can result in degraded performance during peak usage periods. Congestion at peering points6 also can be a source of performance degradation. Over subscription may be used here to limit the payments to the other ISP in cases where there is an imbalance in the originating traffic flows.
Figure 4 illustrates the solution. Figure 4 — IWAN Branch Solution The solution includes dual transport paths between the branch and the corporate data center, a Cisco integrated service router at the branch and dual Cisco routers at the data center. They simultaneously maximize availability and throughput while providing secure connectivity at minimum cost. Specific features include: Transport independence: This solution can be built using a flexible combination of premium WAN and Internet connections with a consistent VPN overlay for all transport types and flexibility to roll out services faster.
Secure connectivity: A secure Internet edge is brought to the branch to consistently protect all endpoints and eliminate backhaul of Internet traffic to the data center. Intelligent path control: This simultaneously minimizes cost while maximizing service availability and allows IT to fully utilize all services.
Application optimization: WAN throughput is optimized while application-specific visibility and control are provided. For example, individual applications can be routed so as to optimize their unique performance requirements for such metrics as latency, packet loss and jitter.
Delivering Premium WAN Reliability at Internet Prices Branches are not simply using the network more; they also are using it for more important business activities. Network applications that affect routine work processes such as customer or supply chain management make network availability vital to business success.
The decision to employ a highavailability network design must consider factors such as branch size, the use of critical applications and the business-wide impact of a network outage versus the added cost of the design. Figure 5 presents network availability trade-offs for single router, single path configurations and for two IWAN configurations. Figure 5 — Network Availability Trade-offs The single router, single path design has availability of This corresponds to 4 hours and 23 minutes and 8 hours and 46 minutes of annual downtime for the MPLS VPN and broadband services, respectively.
The dual path configuration assumes that each transport service is provided by a separate service provider and that the failure of one path is, therefore, independent of the failure of the other path.
Under this assumption availability increases to This creates the opportunity to reduce costs by substituting Internet services for premium WAN services without compromising availability. They span a range of implementation strategies from partial to full 7 8. All of the case studies are for a network consisting of branches and one data center hub site.
A cost comparison is made for the branch transport services. ROI and payback are computed to compare the cost of the initial investment in ISR-AX branch routers with the savings in monthly service charges. The investment includes the cost of the routers, their installation costs, and their service costs.
The ROI computation is for three years. This approach could be used to give businesscritical applications priority access to the retained 1.
Both alternatives deliver availability of With the IWAN solution, traffic is dynamically routed based on application service-level agreement SLA , endpoint type, and network conditions to deliver the best quality experience.
This figure outlines the components of the IWAN solution. Performance Routing is a key pillar of this initiative:. This greatly simplifies the routing by using a single routing domain that encompasses both transports. After the initial spoke-to-hub tunnel is active, it is possible to create dynamic spoke-to-spoke tunnels when site-to-site IP traffic flows require it. In this guide two providers are used, one is considered the primary MPLS , and one is considered the secondary Internet. Dependent on the type of traffic, each of the providers is used to send the traffic.
This makes it more cost effective and frees available resources can be utilized for more innovative business purposes. The MPLS and Internet connections can be terminated on a single router, or terminated on two separate routers for additional resiliency.
It makes the routing configuration much easier. This design enables a spoke to detect that an encryption peer has failed and that the IKEv2 session with that peer is stale, which then allows a new one to be created.
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