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Building a Resilient WAN

Building a Resilient WAN. Data Connectors Tech-Security Conference Sacramento, CA. Alex Ratcliffe Chief Solutions Architect, Talari Networks. Trends Affecting WANs. Increase in use of Interactive & Real-Time Applications Including voice, video, and VDI

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Building a Resilient WAN

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  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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