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Building a Resilient WAN: Insights from Talari Networks at Tech Security Conference

Join Alex Ratcliffe, Chief Solutions Architect at Talari Networks, as he discusses the evolving trends impacting Wide Area Networks (WANs). This presentation highlights the growing reliance on interactive and real-time applications, the need for increased bandwidth, and the implications of single WAN link vulnerabilities. Discover innovative approaches to enhance network reliability, including parallel links and policy-based routing, as well as the role of WAN virtualization in ensuring continuous performance and quality of service. Learn how to ensure seamless application functionality and infrastructure growth while maintaining cost efficiency.

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Building a Resilient WAN: Insights from Talari Networks at Tech Security Conference

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Presentation Transcript

  1. Building a Resilient WAN Data Connectors Tech-Security ConferenceSacramento, CA Alex Ratcliffe Chief Solutions Architect, Talari Networks

  2. Trends Affecting WANs • Increase in use of Interactive & Real-Time Applications • Including voice, video, and VDI • Increase in dependence on network access to conduct day-to-day business • Increase in demand for bandwidth • Increase in centralization of applications and data • Increase in the money lost due an outage or poorly performing WAN

  3. Single WAN Link – Single Point of Failure 99% Your WAN is vulnerable to the availability and quality of that single link Single Link* If your single link has an availability of 99%, your overall reliability will never exceed 99% *Still the case in many WANs today

  4. Parallel WAN Links – Increases Reliability A backup link ensures that one link will always be available, increasing WAN reliability 99% 99% Parallel Links* = 99.99% Overall Reliability = 1 – ((1-0.99) x (1-0.99)) *A better designed system

  5. Fail Over: A Traditional Approach to Network Reliability PRIMARY NETWORK BACKUP NETWORK • During normal operation all traffic goes across primary network

  6. Fail Over: A Traditional Approach to Network Reliability PRIMARY NETWORK BACKUP NETWORK • If the primary network fails, all traffic is switched to backup network

  7. Fail Over: A Traditional Approach to Network Reliability • Fail over allows for recovery … …but applications are still noticeably impacted • Only protects against absolute fail… …can’t react to jitter/loss/latency • Only one network active at any one time… …backup capacity is paid for but rarely used • Backup network may not be able to handle full network load… …no control over which traffic takes precedence

  8. Policy Based Routing:A Better Approach to Network Reliability NETWORK A NETWORK B • Steer traffic based on traffic type • If the primary network fails, all traffic is switched to backup network

  9. Policy Based Routing:A Better Approach to Network Reliability • Both paths are used to carry traffic • Path decisions made based on traffic type • Fail over occurs reasonably (quickly <5s) • Link quality is measured using real time traffic & active probes However • Path selection is Flow Based… …no single app can use multiple wan links • Can’t react well to Jitter/Loss • Round trip data is used to determine best path for unidirectional traffic

  10. WAN Virtualization:Best Network Reliability NETWORK A NETWORK B • Measure using One Way Time, jitter & loss on ALL paths in BOTH directions • Steer based on traffic type, need and network quality • Packet Based decision to forward • Sub-second failover based on any characteristic • Mitigate lost packets (NAK retransmission) • Duplicate critical flows • Smooth out jitter • Aggregate paths together & understand BW availability on both sides of the network

  11. WAN Virtualization:Best Network Reliability • All network paths active all of the time • Best path always selected for critical apps • Adds real end-to-end QoS to BEST EFFORT networks • Seamless failover with no application interuption • Congestion avoidance • Utilize any type for WAN link from any number of providers • Grow infrastructure effectively and with cost constraints as needed

  12. WAN Virtualization:Best Network Reliability • Traffic is encapsulated • This allows EVERY packet to be used in the measurement of quality • Forces predicable path selection (no rerouting) • Add flow sequence to UDP and other non- TCP traffic adding loss mitigation and reorder control to protocols that don’t inherently have it • Packet Fragmentation AND reassembly • Packet duplication • Small packet aggregation • Flows can be load balanced to multiple paths • This is an overlay network • Works with existing network infrastructure and network providers • Complements WAN Optimization

  13. Talari Networks Mercury Appliances • Allow Applications to work without interruption • Provide reliable QoS over Best Effort networks that don’t have inherent QoS • Allow enterprises to grow their WAN infrastructure without sacrificing reliability • Enables the addition of inexpensive network links to supplement WAN connections, improving performance at a low cost Questions?

  14. Thank you Talari Networks www.talari.com twitter @talari info@talari.com

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