Migration Manual South Korea CN2 Station Group How To Switch The Existing Station Group To CN2 Line Solution

Overview: The best, best and cheapest CN2 switching solution

This article is a complete migration manual. The goal is to seamlessly switch the existing station group to a transmission solution based on CN2 lines, especially for Korea CN2 station group users. To strike a balance between "best (performance)", "best (stability and compatibility)" and "cheapest (lowest cost)", it is recommended to perform traffic classification first: key sites use CN2 GIA or high-quality CN2 dedicated lines to obtain the lowest latency and packet loss, and secondary sites consider economical CN2 or hybrid CDN acceleration to find the best point between cost and effect.

Why choose CN2: core advantages of performance and stability

CN2 line A high-quality backbone network provided by China Telecom, with fewer hops, lower jitter and more stable overseas routes. For site groups facing South Korea and East Asia, the CN2 round-trip delay is usually 10-40ms lower than that of ordinary public network links, and the packet loss rate and bandwidth jitter are significantly reduced, which has a direct positive impact on SEO crawling, user experience, and large file downloads.

Preliminary assessment: traffic profiling and business classification

Before migrating, it is necessary to conduct a detailed traffic assessment: count the peak concurrency of each site, the main visitor IP segment (whether it is mainly South Korea or East Asia), the crawling frequency and the CDN cache hit rate. The station groups are divided into categories A/B/C based on business importance: Category A (must have low latency) directly connects to CN2 GIA or dedicated lines; Category B (medium) can use CN2 ordinary lines or hybrid CDN; Category C (low value) uses the cheapest nodes or retains existing lines.

Network solution selection: Comparison of CN2 GIA, CN2 GT and hybrid solutions

CN2 has different types, such as CN2 GIA (international high-quality access) and CN2 GT (general channel). GIA has the lowest latency, highest quality but highest cost; GT has lower cost but second best stability. For Korean site group, it is recommended that Class A sites use CN2 GIA, and Class B sites use GT or jointly use CDN; at the same time, intelligent routing and BGP multi-route redundancy can be used to ensure rapid switching when an exception occurs.

Preparation work: computer room, bandwidth, BGP and certificate

The preparation stage includes: confirming that the Korean/domestic computer room supports CN2 access, purchasing appropriate bandwidth, configuring BGP routing and applying for an AS number (or using service provider BGP). SSL certificate, HTTP/2 or QUIC configuration should be completed before switching and verified on the new line. It is recommended to reserve bidirectional links and deploy NAT/firewall policies to avoid access abnormalities caused by policy mismatch.

Detailed explanation of migration steps: testing, offloading, switching and rollback

Recommended migration steps: 1) Verify CN2 node connectivity and application performance in the test environment; 2) Use small traffic grayscale (by region or subdomain) for offload testing; 3) Gradually increase the traffic proportion to full volume; 4) Establish rollback triggering conditions (such as packet loss rate threshold, error rate threshold) at each step. When switching, the DNS TTL policy should be updated at the same time, in conjunction with health check and load balancing.

DNS and CDN strategies: reduce switching risks and accelerate return to origin

Proper use of low TTL DNS with multi-record polling or GeoDNS can achieve fast switching. CDN can alleviate the pressure of returning to the source during migration, especially for images and static resources. If a third-party CDN is used, confirm that its return-to-origin path preferentially selects the CN2 exit or reaches the CN2 link through an acceleration node to ensure end-to-end performance.

Monitoring and optimization: latency, packet loss, BPS and SEO crawl monitoring

After migration, RTT, packet loss rate, bandwidth utilization, TCP retransmission and TLS handshake time need to be continuously monitored. For SEO and site group operations, it is also necessary to monitor search engine crawling frequency and response codes to ensure that migration does not cause crawling abnormalities. It is recommended to deploy automated alarms to automatically roll back or switch traffic when performance indicators exceed the threshold.

Cost control and price/performance strategy

To achieve the "cheapest" goal, a hybrid deployment can be adopted: put CN2 GIA on Class A sites with peak traffic to ensure the core experience, and put low-value Class C on ordinary lines or cheap VPS; at the same time, evaluate bandwidth usage on a monthly basis, negotiate with operators or purchase reserved bandwidth to reduce the unit price. Combining CDN caching and edge computing to reduce return-to-origin traffic is also an effective way to reduce costs.

Case Study and Frequently Asked Questions: Actual Experience of South Korea’s CN2 Station Group

Common problems include: improper BGP path selection leading to unstable backhaul, long DNS switching TTL causing slow traffic recycling, and unsynchronized certificates causing HTTPS errors. Solution experience: synchronize certificates and link configurations in advance, use the BGP community to specify the best exit, grayscale in stages and monitor closely. Actual cases show that after migrating according to the above process, the page loading time of Korean users can be reduced by 20-40%, and the overall packet loss rate is significantly reduced.

Summary: Key points for a safe migration to CN2

Grasp four key points to ensure successful migration: 1) Segment site groups and value-stratified strategies; 2) Select the appropriate CN2 type and ensure BGP redundancy; 3) Adopt grayscale offloading, low TTL and rollback strategies; 4) Continuous monitoring and optimization to control costs and ensure experience. Through scientific evaluation and step-by-step implementation, your South Korea CN2 Station Group can achieve the best balance between performance and cost.