ChatDiagram
NETWORK TOPOLOGY

Triangle Router Topology with Dual ISPs and OSPF Failover

A worked network topology example, rendered live. Open it in the AI editor and adapt it to your own case.

UPDATED 2026-09-21
TYPENetwork
USE-CASETriangle Router Topology
EXAMPLETriangle Router Topology with Dual ISPs and OSPF Failover
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CASE ANALYSIS

Scenario

A small business needs resilient WAN connectivity using two internet providers and three routers connected in a triangle. OSPF routes between edge and core routers, automatically failing over if an ISP or inter-router link goes down.

Key decisions

  • Use three routers in a triangle to provide redundant WAN paths
  • Connect each edge router to a separate ISP for dual-homing
  • Run OSPF on all router links so failover is automatic

When to reuse this

Reuse for any small-to-midsize branch or campus design where WAN uptime and router redundancy are required, especially with dual ISP uplinks.

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