Designing and Migrating a Resilient Multi-Site MPLS L3VPN with BGP-Based Failover
Designing a multi-site enterprise network in GNS3 with Cisco IOS: MPLS L3 VPN, GRE+IPsec backup tunnels, HSRP and IP SLA redundancy, deterministic BGP-based internet failover, and three live network migrations including DMVPN Dual-Hub Phase 3.
June 15, 2026 41 min read 
