Peering
Network Peering
The handshake deals between networks that let them swap traffic directly. Peering is invisible to users, yet it quietly decides whether a given service feels instant or buffers — and it occasionally becomes a public business fight.
Peering is when two independent networks connect directly to exchange the traffic that flows between their own users. If your ISP peers with a streaming provider's network, your video requests hop straight from one to the other rather than taking a longer, paid detour through a third party. Peering is frequently settlement-free — neither side pays the other — because both benefit roughly equally from the shortcut.
Peering vs transit
The internet is stitched together from two kinds of relationships, and the difference matters:
| Peering | Transit | |
|---|---|---|
| Reaches | Only the peer's own users | The entire internet |
| Payment | Often settlement-free | You pay the transit provider |
| Path | Short and direct | May traverse multiple networks |
| Purpose | Optimise high-volume mutual traffic | Guarantee global reachability |
A network typically buys transit to be reachable everywhere, then sets up peering to offload its biggest, most predictable traffic flows onto cheaper, faster direct links.
Internet exchange points
Most peering happens at an internet exchange point (IXP) — a shared facility where many networks plug into common switching fabric. Connect once to the exchange and you can peer with dozens or hundreds of other members without running a separate cable to each. IXPs keep regional traffic regional: a request between two local networks stays in the city instead of detouring through a distant transit hub, cutting both latency and cost. The whole system is coordinated using BGP, with each network identified by its ASN.
Why peering affects what you experience
Peering quality is a hidden driver of real-world performance. When your ISP has strong, well-provisioned peering with the services you use, traffic takes a short uncongested path and everything feels snappy. When a peering link is under-provisioned or congested, one specific service can buffer and stall while the rest of your connection tests perfectly fine. This is the technical root of the classic complaint, "everything's fast except this one site" — and historically, commercial disputes over who should pay to upgrade a congested peering link have caused exactly that kind of visible slowdown for customers.
Paid peering: the middle ground
Not all peering is free. When traffic between two networks is heavily lopsided — a large content provider sending far more to an ISP than it receives — the parties may agree to paid peering, a direct interconnection that one side pays for. It still gives the short, direct path of peering, but with a commercial arrangement that reflects the imbalance. Paid peering sits between settlement-free peering and full transit, and large content networks use it to place their traffic directly inside major ISPs for the best possible delivery to subscribers.