If you have spent any time researching servers or VPS hosting for China-facing deployments, you have almost certainly encountered the terms CN2 GIA, CN2 GT, and BGP. Providers use them as selling points — but the explanations are often vague, technically incomplete, or buried in marketing language.
This guide cuts through the noise. We explain exactly what each routing type is, how they differ in real-world performance, who should care about the distinction, and how to verify which routing your server is actually using.
Background: Why China Network Routing Is Complicated
China’s internet infrastructure is architecturally different from the rest of the world. All international internet traffic entering or leaving mainland China must pass through a small number of government-controlled international gateway nodes — located primarily in Beijing, Shanghai, and Guangzhou — operated by China’s three major carriers: China Telecom, China Unicom, and China Mobile.
These gateway nodes are the physical chokepoints of China’s internet. They handle an enormous volume of traffic, and during peak usage hours — typically 18:00 to 24:00 China Standard Time — congestion at these nodes causes measurable increases in latency and packet loss for international connections using standard routing.
The three routing types — BGP, CN2 GT, and CN2 GIA — represent different ways of getting traffic through (or around) these chokepoints.
Option 1: BGP (Border Gateway Protocol) — Standard International Routing
What it is
BGP is the standard routing protocol that governs how traffic moves between autonomous networks (ASes) on the global internet. When a server uses “BGP routing” to connect to China, it means traffic takes the standard public internet path — passing through commercial peering arrangements between international carriers and China’s gateway operators.
How it performs
BGP routing to China is adequate during off-peak hours but degrades significantly under load. The fundamental problem is that the peering capacity between international networks and China’s gateway nodes is chronically underprovisioned relative to demand. This creates:
- Latency spikes of 50–200 ms above baseline during peak hours
- Packet loss rates of 2–10% during congested periods
- Inconsistent jitter that makes real-time applications unreliable
- Route flapping — traffic taking suboptimal paths as BGP recalculates routes
Who uses BGP routing
Most standard VPS and dedicated server providers use BGP routing by default. It is the cheapest option from an infrastructure cost perspective, which is why it is the baseline offering at most price points.
Suitable for
- Non-time-sensitive batch workloads (backups, file transfers)
- Websites with low Chinese visitor volumes where performance is not a priority
- Development and staging environments
Option 2: CN2 GT (Global Transit) — China Telecom’s Mid-Tier Route
What it is
CN2 GT is China Telecom’s Global Transit product — a commercial routing tier that uses China Telecom’s CN2 backbone network (AS4809) for at least part of the path between international servers and Chinese end users. The “GT” designation means the traffic enters the CN2 backbone at some point, but the last-mile delivery within China still transitions to China Telecom’s standard 163 network (AS4134) or other carriers’ domestic infrastructure.
How it differs from standard BGP
CN2 GT improves on standard BGP in two ways:
- International traffic travels on China Telecom’s private CN2 backbone rather than through public peering, reducing congestion exposure for the international leg of the journey
- The CN2 backbone (AS4809) has higher capacity and better traffic engineering than the standard 163 network
However, because CN2 GT traffic still hands off to the standard 163 network for domestic Chinese delivery, it inherits some of the congestion characteristics of that network — particularly for users whose ISP is China Unicom or China Mobile rather than China Telecom.
Real-world performance
CN2 GT typically delivers:
- Latency improvement of 10–30 ms over standard BGP to major Chinese cities
- Packet loss rates of 0.5–2% during peak hours (better than BGP, worse than CN2 GIA)
- More consistent daytime performance, with some degradation during peak evening hours
Suitable for
- Websites and applications with moderate Chinese traffic where budget is a constraint
- Non-real-time web applications (blogs, content sites, B2B portals)
- Businesses that need better-than-BGP China connectivity without the full CN2 GIA premium
Option 3: CN2 GIA (Global Internet Access) — China Telecom’s Premium Route
What it is
CN2 GIA is China Telecom’s Global Internet Access product — the premium tier of the CN2 family. The critical distinction from CN2 GT is that with CN2 GIA, traffic stays on the CN2 backbone network (AS4809) for the entire journey, from international ingress point all the way through to the Chinese end user. There is no handoff to the congested 163 network.
Think of it this way: CN2 GT is like taking a highway for most of your journey but merging onto a congested local road for the last few kilometres. CN2 GIA keeps you on the highway all the way to the destination.
How it performs
CN2 GIA is the gold standard for international-to-China connectivity. In practice, it delivers:
| Metric | Standard BGP | CN2 GT | CN2 GIA |
|---|---|---|---|
| Avg. Latency HK → Shanghai | 40–80 ms | 30–50 ms | 20–35 ms |
| Avg. Latency HK → Beijing | 50–100 ms | 40–65 ms | 30–50 ms |
| Peak-hour packet loss | 2–10% | 0.5–2% | <0.1% |
| Evening congestion impact | Significant | Moderate | Minimal |
| Jitter consistency | Poor | Moderate | Excellent |
| Relative cost premium | Baseline | +10–20% | +25–50% |
Why the evening congestion resistance matters
China’s internet usage peaks sharply between 18:00 and 24:00 CST — exactly when your Chinese users are most active. E-commerce transactions, live streaming viewership, gaming sessions, and social platform usage all spike during this window. A server on standard BGP or CN2 GT may perform adequately at 10:00 AM but degrade noticeably by 20:00. CN2 GIA maintains consistent performance through this window because its dedicated capacity is not shared with the general public internet traffic that floods the 163 network during peak hours.
Suitable for
- E-commerce platforms processing transactions from Chinese consumers
- Gaming servers requiring consistent low-latency connectivity to China
- Live streaming infrastructure with real-time ingest from Chinese hosts
- SaaS products with Chinese business users where performance is part of the value proposition
- Financial applications and payment processing where latency spikes cause transaction failures
- Any application where evening peak-hour performance in China is business-critical
Multi-Line BGP: A Note on Hybrid Routing
Some providers offer multi-line BGP configurations that combine routes from China Telecom, China Unicom, and China Mobile — automatically selecting the best path for each user based on their ISP. This approach improves coverage across China’s three major carrier networks compared to single-carrier routing.
However, multi-line BGP is not a substitute for CN2 GIA. It still routes traffic through the standard public internet peering infrastructure, which means it inherits the congestion characteristics of the 163 network and equivalent Unicom/Mobile backbones during peak hours. Multi-line BGP is better than single-carrier standard BGP, but CN2 GIA remains superior for consistent peak-hour performance.
How to Verify Your Server’s Actual Routing
Marketing copy does not always match reality. Here is how to verify what routing your server is actually using to reach China:
Step 1: Run a traceroute to a Chinese IP
traceroute 202.96.209.5This is a China Telecom DNS server in Shanghai. Run this from your server and examine the hops.
Step 2: Identify the AS numbers in the path
Look for these AS numbers in the traceroute output:
- AS4809 — China Telecom CN2 backbone (what you want to see for CN2 GIA/GT)
- AS4134 — China Telecom 163 standard network (indicates standard BGP or CN2 GT last-mile)
- AS9929 — China Unicom backbone
- AS4837 — China Unicom standard network
If your traceroute shows AS4809 hops from ingress all the way to the Chinese destination with no AS4134 handoff, you are on CN2 GIA. If AS4809 appears briefly but then transitions to AS4134, you are on CN2 GT.
Step 3: Test at peak hours
Run your latency and packet loss tests between 20:00 and 22:00 CST. This is when the difference between CN2 GIA and lower-tier routing becomes most visible. A CN2 GIA connection should show minimal latency increase; a standard BGP connection may degrade by 50–150 ms or more.
Which Routing Does Server.HK Use?
Server.HK’s Hong Kong VPS and dedicated server plans use CN2 GIA routing as standard — not as an optional upgrade. This means every plan benefits from China Telecom’s premium backbone, with the consistent low-latency and low-packet-loss performance that CN2 GIA delivers, including during China’s peak evening hours.
This is the routing infrastructure that cross-border e-commerce platforms, gaming operators, and enterprise businesses rely on when China connectivity performance is non-negotiable.
Summary: Which Routing Should You Choose?
| Routing Type | Best For | Avoid If |
|---|---|---|
| Standard BGP | Dev/staging, non-China traffic, batch workloads | Any real-time or peak-hour China use case |
| CN2 GT | Budget-constrained China-facing sites with moderate traffic | Gaming, payments, live streaming, peak-hour SaaS |
| CN2 GIA | E-commerce, gaming, streaming, enterprise, any latency-sensitive China workload | No significant reason to avoid if China performance matters |
If your application serves Chinese users and performance during peak hours matters to your business, CN2 GIA is the only routing tier that reliably delivers. The cost premium over standard BGP is modest relative to the business impact of consistent China connectivity — and it is standard on every Server.HK Hong Kong VPS plan.
Frequently Asked Questions
Is CN2 GIA only available in Hong Kong?
No, but Hong Kong is the most cost-effective and geographically optimal location for CN2 GIA access. CN2 GIA is also available from some US West Coast and Japan data centres, but at higher price points and with greater physical distance to Chinese end users.
Does CN2 GIA work for all Chinese ISPs — Telecom, Unicom, and Mobile?
CN2 GIA primarily benefits China Telecom subscribers directly. China Unicom and China Mobile users will still see improvement over standard BGP (because the international leg of the journey is on high-quality infrastructure), but the last-mile delivery within China for non-Telecom users involves carrier interconnect handoffs that introduce some variability. For the broadest China coverage, some providers combine CN2 GIA with multi-line BGP fallback.
Can I tell from ping times alone whether I have CN2 GIA?
Ping times alone are not conclusive — baseline latency varies by geography and time of day. The most reliable test is a traceroute that shows AS4809 hops throughout the path, combined with a peak-hour packet loss test. Consistent sub-1% packet loss to Chinese IPs during 20:00–22:00 CST is a strong indicator of CN2 GIA quality routing.
Is CN2 GIA affected by the Great Firewall?
CN2 GIA is a network routing product that determines how packets physically travel between your server and Chinese users. It is separate from content filtering. The Great Firewall operates at a different layer — it inspects and filters traffic content regardless of which routing tier is used. CN2 GIA improves the speed and reliability of the connection; it does not affect what content Chinese users can access.