By Massive IT · March 1, 2026
At a glance
| Project dimension | Outcome and scope |
|---|---|
| Industry | Regional Internet Service Provider, Northeastern United States |
| Network footprint | More than 10 Points of Presence (PoPs) |
| Transformation | Two production BGP autonomous system numbers consolidated into one |
| Customer-facing downtime | Zero |
| Project duration | Approximately 1–3 months |
| Long-term support | Ongoing maintenance, engineering escalation support, and incident response retainer |
The challenge: Integrating an acquired ISP network
Following an acquisition, a large regional ISP needed to bring separate routing environments under a unified network architecture. Multiple autonomous system numbers (ASNs), inherited static routes, Border Gateway Protocol (BGP) policies, Open Shortest Path First (OSPF) configurations, and undocumented dependencies complicated operations and increased the risk of routing changes.
In practical terms, the ISP needed its networks to operate as one without interrupting subscriber connectivity. The goals were simpler administration, improved redundancy and routing performance, and an architecture ready for further growth.
The solution: Discover, standardize, and migrate
Massive IT led network discovery, design, configuration, implementation, and validation with support from the ISP's engineering team.
1. Discover the routing environment
Engineers audited router configurations and mapped previously undocumented dependencies. This established the relationships and routing behavior that needed to be preserved during the transition.
2. Standardize the network foundation
The team removed obsolete routing configurations and standardized internal OSPF routing, BGP policies, prefix filters, and route advertisements. These changes prepared the separate environments for a consistent production design.
3. Migrate in controlled phases
Routers, external BGP peering relationships, and advertised IP prefixes were migrated in phases to a single production ASN. Planned maintenance windows, prevalidated configurations, carrier coordination, redundant network paths, live monitoring, and rollback procedures supported uninterrupted subscriber service.
Validation: Confirming production stability
After cutover, Massive IT verified BGP sessions with upstream carriers, confirmed correct prefix advertisements, validated OSPF propagation, performed redundancy and failover tests, and checked connectivity across network locations. The team monitored latency, packet loss, traffic, and routing stability for an extended post-migration period.
The results
Two ASNs became one, with zero customer-facing downtime across a network spanning more than 10 PoPs. Completed in approximately one to three months, the project simplified routing administration and troubleshooting, improved resiliency and routing efficiency, reduced operational overhead, and established a standardized platform for future expansion and acquisitions.
These outcomes describe this specific project, not a guarantee for future migrations.
Continued engineering support
Following the consolidation, the ISP engaged Massive IT on retainer for maintenance, advanced engineering escalations, and incident response, extending the relationship beyond the original migration project.
Modernize your network with Massive IT
Whether you are an ISP consolidating autonomous systems, an enterprise integrating an acquisition, or an IT provider seeking advanced network engineering support, Massive IT can help plan and execute complex routing changes with an emphasis on resilience and business continuity.
Schedule a consultation to discuss your network engineering requirements.