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Redundant Network Design
By: Brett C. Lewis
Why ?
•  Every organization, no matter what the industry,
   faces significant risks when voice and data
   communications are interrupted
 ▫  Productivity comes to a halt
 ▫  Transactions cannot be processed
 ▫  Critical applications go offline
 ▫  Employees can’t serve customers
 ▫  Liability and fraud exposure increases
What is redundancy ?
•  “2” connections utilizing “2” diverse routes and
   “2” separate carriers combining at the same
   destination supplying a single service.
Facts about Carriers
•  85% of all municipal carriers share the same
   middle mile ingress and egress conduits and
   connections.

•  95% of all municipal carriers share the same last
   mile switching and terminations.

•  98% of all Tier 3 Internet Carriers use the local
   municipal carriers for last mile access.
2 Internet Carriers
•  Two carriers that have diverse egress routes out
   of the local area

•  Two carriers that have diverse ingress routes to
   your location.
Diverse Internet Technologies
Load Balancing         BGP
2 WAN Carriers
•  Two carriers that can scale their capacity to
   become the primary carrier at any moment.

•  Two carriers that are not subject to the same
   environmental impacts.
 ▫  Line cuts
 ▫  Rain
 ▫  Weather
 ▫  Construction
Diverse WAN Technologies
 Spanning Tree   OSPF      Ether Channel
My Perfect Scenario
                      Multiple Office



      Single Office
Summary
•  True redundancy requires 2 of all core services
   with a single destination
•  85% of all carriers share conduit and leased line
•  Utilizing different connectivity and networking
   technologies can assist in creating a truly
   redundant network.
Questions

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Brett Lewis Redundant Network Design

  • 2. Why ? •  Every organization, no matter what the industry, faces significant risks when voice and data communications are interrupted ▫  Productivity comes to a halt ▫  Transactions cannot be processed ▫  Critical applications go offline ▫  Employees can’t serve customers ▫  Liability and fraud exposure increases
  • 3. What is redundancy ? •  “2” connections utilizing “2” diverse routes and “2” separate carriers combining at the same destination supplying a single service.
  • 4. Facts about Carriers •  85% of all municipal carriers share the same middle mile ingress and egress conduits and connections. •  95% of all municipal carriers share the same last mile switching and terminations. •  98% of all Tier 3 Internet Carriers use the local municipal carriers for last mile access.
  • 5. 2 Internet Carriers •  Two carriers that have diverse egress routes out of the local area •  Two carriers that have diverse ingress routes to your location.
  • 7. 2 WAN Carriers •  Two carriers that can scale their capacity to become the primary carrier at any moment. •  Two carriers that are not subject to the same environmental impacts. ▫  Line cuts ▫  Rain ▫  Weather ▫  Construction
  • 8. Diverse WAN Technologies Spanning Tree OSPF Ether Channel
  • 9. My Perfect Scenario Multiple Office Single Office
  • 10. Summary •  True redundancy requires 2 of all core services with a single destination •  85% of all carriers share conduit and leased line •  Utilizing different connectivity and networking technologies can assist in creating a truly redundant network.