Zero-Downtime Network Migration
Migrated a 400-node banking infrastructure to SD-WAN over a single live weekend with zero service disruption.
Where Meridian Bank was stuck.
Meridian Bank's network infrastructure was a patchwork of hardware spanning two data centres and 28 branches, running on equipment averaging 9 years old. MTTR for major incidents was over 4 hours. The compliance team had flagged three critical vulnerabilities in the existing MPLS topology. The previous vendor had scoped the migration at 6 months with two planned downtime windows, neither acceptable to operations or to regulators.
How we solved it.
We designed a phased SD-WAN migration plan that isolated risk at every stage. Branches were migrated in cohorts of four, each tested in a shadow mode before cutover. The two data centres were migrated in a coordinated overnight window using pre-validated runbooks with 15-minute rollback checkpoints. All 400 nodes were migrated in 14 weeks of preparation and a single 52-hour cutover weekend.
Results that matter.
The migration completed on schedule with zero unplanned downtime. MTTR dropped from 4 hours to under 18 minutes. All three compliance vulnerabilities were resolved. Network performance improved by 34 % on average across branches. Meridian subsequently engaged Setten on a 3-year managed network service agreement.
during migration
down from 4 hrs
across branches
18 months running
"Tom and the Sustain team planned the cutover in granular detail and executed it over a single weekend without a single outage. Our previous vendor said it would take six months with two downtime windows. Setten did it in three months with none."
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