IP Transit Explained: BGP, Routes, Peering and...

In a nutshell: IP transit is wholesale internet reachability. A provider carries your traffic to and from the global internet, usually using BGP to exchange routes. The quality of transit depends on routing policy, peering, backbone capacity, support and resilience, not only port speed.

What IP transit is

IP transit is a service where an internet service provider announces your prefixes to the global internet and carries your traffic to destinations beyond its own network. It is different from a normal business broadband service because it is designed for organisations that need their own public IP routing, data-centre connectivity or internet-facing infrastructure.

Most IP transit uses BGP. Your router and the provider router exchange route information, so traffic knows which path to take in and out of your network.

Transit, peering and DIA

Service	Plain-English meaning	Typical buyer
Dedicated internet access	Business internet with committed access bandwidth.	Offices and sites that need reliable internet.
IP transit	Internet reachability for your own routed network or hosted services.	Data centres, SaaS platforms, ISPs, large enterprises.
Peering	Direct traffic exchange between two networks, often at an internet exchange.	Networks with enough traffic to justify direct interconnection.

Design choices that matter

The first decision is whether you need a full BGP table, a partial table or only a default route. A full table gives more control but needs routers with enough memory, CPU and operational expertise. A default route is simpler but gives less path control.

For resilience, many buyers take transit from two providers and advertise their prefixes through both. Multihoming only helps if the physical routes, cross-connects, routers, power and support processes are actually diverse.

What makes transit good or bad

Two 10 Gbps transit ports can behave very differently. Important factors include local and regional peering, backbone congestion, route stability, DDoS scrubbing, blackhole support, community controls, ticket response and how quickly route leaks or hijacks are handled.

For Singapore buyers serving APAC users, ask about routes to Indonesia, Malaysia, India, Hong Kong, Japan, Australia and major cloud regions, not only generic global reach.

IP transit buyer checklist

Do you need your own ASN and provider-independent IP space? Will you receive full routes, partial routes or a default route? Are BGP communities, blackholing and DDoS options documented? Are cross-connects, routers and carriers physically diverse? Can the provider show regional latency and packet-loss performance? Who handles BGP incidents, route leaks and prefix filtering?

Sources and further reading

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IP Transit Explained: BGP, Routes, Peering and Internet Reachability