BGP servers essentially access multiple operator networks through the BGP protocol, such as China Telecom, China Unicom, China Mobile, PCCW, NTT, HE, CTGNet, etc. The BGP protocol allows servers to establish connections with multiple operator lines and implement path selection based on the shortest routing path strategy between autonomous systems (AS).

　　However, in reality, BGP servers only have a single IP access to multiple lines, which does not mean that end users must take the optimal route when accessing the server. Since BGP's "shortest autonomous system path" is not equivalent to the "lowest latency path", in some cases, although the path has the least hops, a node in the middle has a high load or bandwidth bottleneck, which may lead to increased latency.

　　Analysis of the main reasons for the high latency of Hong Kong BGP cloud servers:

　　Many BGP Hong Kong servers do not configure optimized return paths for the Chinese mainland. For example, the export takes international routes such as HE and NTT. Although they have the ability to connect to multiple countries overseas, they take obvious detours when returning to the mainland, which increases the number of hops and latency.

　　BGP itself only calculates paths based on attributes such as AS_PATH, MED, and LOCAL_PREF, and does not pay attention to network quality indicators such as real-time delay and packet loss. This means that even if there is a lower-latency path, the server-side router may still choose an inferior path.

　　Hong Kong's local network structure is highly dependent on cross-border links. The interconnection between the three major operators in mainland China and international operators has problems such as cost, bandwidth bottlenecks, and congestion at interconnection points. Users in different regions have different access paths, which may be directly connected to the backbone or bypass the international exit.

　　Some cloud service providers simply configure BGP as multi-line inbound, which does not have a complete intelligent scheduling mechanism, especially in the return link. There is no fixed strategy, and the access quality fluctuates significantly.

　　How to effectively solve the delay problem of BGP Hong Kong cloud server?

　　1. Clarify the purpose and choose a BGP server that supports mainland optimization

　　If the user mainly visits users in mainland China, the Hong Kong BGP cloud server with labels such as "mainland optimized return" or "CN2 GIA" should be preferred. This type of server is usually connected to high-quality exports such as CTGNet, CN2, and CMI; the return path is fixed to the mainland backbone, without HE or NTT; the delay is stable, and the PING value to South China is as low as 10ms. You can use tools such as traceroute and mtr to test whether the return path of the BGP server passes through high-quality lines.

　　2. Use Anycast or GeoDNS technology to dispatch traffic

　　If the business involves global user access, it is recommended to deploy Anycast IP or a regional scheduling mechanism based on GeoDNS. Users request to access nodes in different regions nearby, automatically avoiding the unfavorable network conditions of Hong Kong nodes in specific areas, and improving overall availability and response speed.

　　3. Manually configure return strategy or deploy transit nodes

　　For users with autonomous BGP policy control capabilities, you can manually guide the return path by setting MED or COMMUNITY values. For example, prioritize the return traffic back to the mainland via China Telecom. If the server does not have autonomous BGP authority, you can optimize the link by deploying transit jump boards in Shenzhen, Guangzhou, etc.

　　4. Enable TCP congestion control algorithm and QoS policy optimization

　　Modern operating systems support congestion control algorithms such as BBR and Cubic, which can effectively deal with high-bandwidth delay product bottlenecks compared to traditional Reno. For high-concurrency services, QoS (quality of service) strategies are used to prioritize the scheduling of key business packets, such as HTTP request headers and video key frames, which helps reduce user-side perceived delays.

　　5. Use CDN to cache and divert content requests

　　For static resource-intensive services, content can be cached to edge CDN nodes, greatly reducing the frequency of back-to-source requests and reducing the traffic pressure on the main server. Hong Kong local cache nodes are extremely friendly to mainland access and are particularly important when the main server delay is unstable.

　　Hong Kong BGP cloud servers have natural multi-line advantages and convenient regional network interconnection, but to truly achieve low latency and high availability, in-depth optimization is required in multiple dimensions of return paths, scheduling strategies, network structures, and operation and maintenance systems.

　　The root cause of the delay problem lies in the line structure and network scheduling mechanism, and the solution depends on precise selection and flexible deployment strategies. For users whose core scenario is access from the mainland, choosing a Hong Kong BGP cloud server that supports mainland optimization and combining it with intelligent scheduling, transit optimization, content distribution and other means can truly unleash the performance potential of the Hong Kong node and achieve stable and efficient business operation.