Anycast is a network addressing and routing method where many CDN nodes announce the same IP address, and the internet's routing automatically delivers each viewer's request to the topologically nearest one. It is one of the two main ways CDNs steer traffic to the right edge (the other being DNS-based routing).
Anycast reacts quickly to network conditions and node failures - if a PoP drops out, routing converges to the next nearest - which makes it resilient and simple from the client's view. Its limitation is coarser control compared to DNS or application-layer steering, so large platforms often combine techniques to balance precision, performance, and failover.
The handbook · 7 volumes
Fora Soft Video Engineering Handbook
Anycast sends each viewer to the nearest CDN node through one IP address, which cuts start time but can hide routing problems. Our seven volumes cover the video stack; for anycast and CDN routing start with Volume 3 on CDNs, caching, and the economics of delivery, then Volume 2 on network behaviour and QUIC, with encoding in Volume 1. Written by Nikolay Sapunov, CEO at Fora Soft.
Choosing a CDN setup with anycast for viewers across several regions?
We will review your audience geography and send a CDN routing plan with expected start times and costs. 250+ video products shipped since 2005.
