Comparing Singapore CN2 With Other Lines: Which Services Are More Suitable To Choose CN2?

2026-08-21 22:31:01
Current Location： Blog > Singapore CN2
Singapore CN2

1. Overview: What is CN2 and common alternative routes

CN2 is the next-generation backbone network launched by China Telecom. It is divided into two categories: CN2 GIA (high-quality, priority forwarding) and CN2 GT (general high-quality transmission).
Common alternative lines include: China Unicom/China Mobile's own international links, ordinary international IP (non-CN2), multi-line BGP (multiple operator load/switching) and dedicated lines/SD-WAN, etc.
Key points for selection: Check whether the link direct connectivity, delay (RTT), packet loss, jitter and SLA of the target point (Singapore) meet business requirements.

2. Assess needs: ask yourself 5 questions first

(1) Business type: real-time (game/voice) or non-real-time (file/backup)?
(2) Delay sensitivity: Is it required to be <100ms or <50ms? (Financial high frequency is more demanding)
(3) Packet loss/jitter tolerance: VoIP and video are very sensitive to packet loss/jitter.
(4) Budget and bandwidth: Can you accept the higher cost of CN2 in exchange for a more stable experience?
(5) Redundancy requirements: Is multi-link + automatic switching required?

3. How to do actual measurement: step-by-step operation commands and indicator interpretation

Step 1: Prepare test nodes (domestic computer room and Singapore target IP/host).
Step 2: Test delay and packet loss: ping -c 20 , record the average RTT and packet loss rate.
Step 3: Routing path: traceroute -n or Windows tracert -d to see if the CN2 transit node is used (usually the china telecom CN2 logo or a specific hop can be seen).
Step 4: Comprehensive connectivity: mtr -r -c 100 (Linux), check the packet loss and delay jitter distribution of each hop.
Step 5: Bandwidth and throughput: iperf3 -c -t 60, detect the actual TCP/UDP bandwidth.
Interpretation: RTT average + 99% quantile, packet loss <0.5% is considered good, jitter <30ms is acceptable, games/voice recommends packet loss <0.1% and RTT as stable as possible.

4. Comparison points between CN2 and other lines (explanation one by one)

Latency: CN2 is usually directly connected to the international backbone, and the delay is more stable and lower.
Packet loss/jitter: CN2 GIA prioritizes processing at nodes, shorter queues, and less jitter and packet loss.
Routing stability: CN2-specific policies are less affected by regular network fluctuations.
Cost: The cost of CN2 is higher than that of ordinary international IP. Multi-line BGP is flexible but requires self-built switching strategies.
Recommendation: Give priority to CN2 GIA or CN2 GT for real-time services; use multi-line BGP or CDN for medium and low-sensitive services.

5. Which businesses are more suitable to choose CN2 (detailed scenarios and selection guide)

Games (client games/mobile games): Give priority to CN2 GIA or CN2 GT, reasons: low latency, low jitter and stability.
Real-time voice/video/conferencing: CN2 GIA is preferred. If the budget is limited, CN2 GT can be used, combined with QoS if necessary.
Financial/trading system: A high-priority link (CN2 GIA) must be selected and requires SLA and fast failover.
SaaS/enterprise cloud access: CN2 is preferred for enterprise services that are sensitive to experience, otherwise multi-line + intelligent routing can be used.
CDN/large file distribution: Priority is given to edge caching. When the real-time requirements for back-to-origin are low, it is not necessary to use CN2.

6. Detailed steps of procurement and deployment (from demand to launch)

Step 1: Organize the demand list (service type, target IP, peak bandwidth, SLA, redundancy requirements).
Step 2: Inquiry and comparison (inquire with China Telecom/China Unicom/China Mobile and third-party cloud network providers, and ask for quotations and SLAs for CN2 GIA/GT and ordinary lines).
Step 3: Sign the contract and confirm the delivery period and connection point (which computer room in Singapore and whether it is directly connected to the computer room cabinet).
Step 4: Physical or logical access: Apply for cross-border dedicated line or fiber delivery in the computer room, confirm BGP ASN, peer IP and subnet.
Step 5: BGP Configuration Sample (Cisco IOS):
- router bgp 65001
- neighbor X.X.X.X remote-as 4812
- neighbor X.X.X.X description CT-CN2-GIA
- network 1.2.3.0/24 mask 255.255.255.0
Step 6: Verify before going online (ping/traceroute/iperf3), and switch traffic in the time window confirmed by both parties.
Step 7: Set up monitoring and alerting (see next paragraph).

7. Practical configuration of monitoring, SLA and failover

Monitoring items: periodic ping, mtr alarm, bandwidth utilization, BGP neighbor status, packet loss jitter curve.
Tool configuration: Use Prometheus+Grafana or Zabbix, ping interval is 30s, mtr runs regularly every day and reports exceptions.
Key items of SLA: Commitment delay limit, packet loss rate, repair time (MTTR) and compensation terms. When signing the contract, clear quantitative indicators are required.
Failover: Multi-line BGP + health detection (such as BFD or script) is recommended. Example strategy: When CN2 packet loss >1% and RTT >150ms for more than 2 minutes, automatically switch to the backup line.
Drill: Conduct a failover drill every quarter and record the switchover time and business impact.

8. Question: How can I tell whether my game business must be upgraded to CN2?

Answer: According to the above actual measurement process, first use mtr and iperf3 on the existing line for at least 24 hours of continuous monitoring: if the average RTT is higher than 150ms, packet loss exceeds 0.5%, or jitter exceeds 50ms and user complaints are concentrated in delay/packet loss scenarios, it is recommended to upgrade to CN2 (CN2 GIA is preferred). At the same time, compare the CN2 test results provided by the supplier. If CN2 reduces the average RTT to <100ms and reduces packet loss to <0.1%, it should be upgraded.

9. Question: What are the common configurations and precautions when deploying CN2?

Answer: Things to note include confirming the peer ASN and public IP, subnet prefix length policy, whether MPLS bearer is required, whether BFD is enabled for fast detection, whether fixed route priority (AS-path or LocalPref) is required, and whether the SLA and bandwidth burst policy are specified in the contract. Before going online, be sure to verify BGP neighbor stability and route advertisement correctness in a low-traffic window.

10. Question: With a limited budget, how can we get an experience close to CN2 at the lowest cost?

Answer: A hybrid strategy can be adopted: core real-time traffic goes through CN2 (purchasing a small amount of bandwidth or on-demand bandwidth), and other traffic goes through lower-cost multi-line BGP; at the same time, deploy CDN/edge services in Singapore or use cloud vendor Direct Connect to reduce return-to-origin traffic. Combined with a traffic scheduler (such as smart DNS or SD-WAN) and setting strict monitoring and automatic switching rules, the user experience can be significantly improved within a limited budget.

Tags：Singapore CN2 CN2 Lines CN2 Comparison International Link Selection Singapore Network Acceleration CN2GIA CN2GT Overseas Business Acceleration More»
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