Cascading SFUs for Geographic Scale
Learn how to chain multiple SFUs across regions to scale large real-time sessions globally while keeping latency low and bandwidth manageable.
The Single SFU Ceiling
A single SFU (Selective Forwarding Unit) forwards each participant's media to others. But one SFU has limits: CPU, network egress, and the latency of being far from some users.
Cascading SFUs link multiple SFUs together to break through that ceiling.
What Cascading Means
Instead of every participant connecting to one central SFU, participants connect to a nearby SFU. Those SFUs then forward streams to each other.
- Local users connect to a local node.
- Nodes exchange only the streams that remote users actually need.
All lessons in this course
- SFU vs. MCU Architectures
- Load Balancing Signaling Servers
- Distributed STUN/TURN Services
- Cascading SFUs for Geographic Scale