Updated 29 Aug 2025 · 6–8 minute read

Zero-downtime strategy

  • Parallel install: overlap old/new circuits (FTTP/SOGEA/Leased Line).
  • Dual-WAN with policy routing or SD-WAN for staged traffic moves.
  • 4G/5G backup active in case either link drops.
  • DNS cutover plan: low TTLs, staged changes, rollback.

Step-by-step cutover

  1. Order new service with overlap; confirm ONT/NTU location & power.
  2. Configure WAN2; test outbound/inbound, VPNs and SaaS.
  3. Move guest Wi-Fi/non-critical first; then VoIP/ERP once stable.
  4. Lower DNS TTLs; update externals (website, SPF, remote users).
  5. Monitor latency/loss; keep old circuit for fallback until sign-off.
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Related guides

Leased Line vs FTTP Choose the right access. SOGEA vs FTTP Retail rollout strategy. When to Choose a Leased Line SLAs & symmetry.

Recently asked questions

Can we reuse our public IPs?

Usually not when changing providers. Use DDNS or plan DNS/SPF/VPN updates; SD-WAN can mask IP changes for some apps.

What if the new line isn’t stable on day one?

Keep the old circuit active as fallback and use dual-WAN to revert instantly. Only cease after soak testing.

Do we need after-hours cutover?

Recommended for offices/retail. For 24/7 sites, use per-VLAN staged moves with live monitoring.