Centralium: A Hybrid Route-Planning Framework for Large-Scale DC Network Migrations#

Yikai Lin et al. (Meta, UMass)

Why: BGP datapath/migration pain is a real operational problem; native BGP can't express the staged, topology-aware conditions migrations need.

What: A Route Planning Abstraction augmenting BGP for centralized planning with distributed enforcement, with 10+ production migration use cases and a substantial reduction in migration time/risk.

How: RPA encodes both sequential and spatial migration conditions BGP can't, driven by a centralized controller deployed alongside existing BGP.

Where applicable: Meta-specific deployment but the abstraction generalizes to any large BGP-routed DC facing migrations.