Designing a High-Availability Network Architecture
Redundancy is more than buying two of everything. Here is how to design networks that survive device, link and site failures gracefully.
Identify single points of failure
Map every path from users to critical applications. A dual-firewall pair is wasted if both connect to a single core switch fed by one power circuit. Walk the path physically and logically — power, cabling, devices, ISPs and DNS.
Choose the right redundancy model
Active-active designs use capacity on both paths and fail over quickly, but need careful load balancing. Active-standby is simpler to operate. For WAN and internet, dual ISPs with BGP or SD-WAN path selection remove dependence on a single carrier.
Building blocks of resilient design
- Redundant core and distribution with link aggregation
- First-hop redundancy (VRRP/HSRP) for gateways
- Dynamic routing (OSPF/IS-IS, BGP) instead of static routes
- Diverse fibre paths into the building
- Out-of-band management access
- Documented failover tests
Test failover before it tests you
Schedule controlled failover drills: pull a link, reboot a core switch, fail an ISP. Measure how long applications take to recover and fix anything that surprises you. A design that has never been tested is only a hypothesis.
How Infivate Networks can help
Infivate Networks delivers Security & Network Operations for organisations across India — from assessment and design to implementation and ongoing support. Talk to our team or email [email protected].
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