Case Study On The Performance Monitoring Of The CN2 Route To The United States Via Singapore During Holidays And Peak Periods

Question 1: Why CN2 Go to the US and get it approved Around Singapore Does the performance experience significant degradation during holidays and peak times?

The main reasons include: One is Link congestion The concentrated traffic during holidays causes bandwidth bottlenecks at Singapore’s entry/exit points or certain undersea cable junctions ； Secondly Route changed (BGP policies or transit provider adjustments) cause traffic to take a longer physical path ； Third, the processing capacity of intermediate switches or firewalls under high load decreases, causing jitter and packet loss. Therefore, during holidays and peak periods, path quality fluctuates significantly.

Question 2: What key metrics need to be monitored for this path?

Monitoring Dimensions

Key indicators include: 1) Delay (RTT) ； 2) Packet loss rate ； 3) Jitter (Delayed mutation) ； 4) Routing hop count and path stability (AS path changes) ； 5) Throughput and bandwidth utilization. Combining business-level MOS or HTTP response time can provide a more intuitive reflection of user perception.

Question 3: How to design monitoring and sampling strategies for holidays and peak periods to obtain comparable data?

Sampling Frequency and Distribution

It is recommended to set a baseline period and an event period of at least 7 days each around regular weekdays and the target holiday, sampling RTT/packet loss every minute or every 5 minutes ； During peak hours (local working hours and prime evening times), it can be increased to sampling every 30 seconds. At the same time, probes need to be deployed at multiple locations (domestic exit, Singapore node, US entry) to capture end-to-end and segmentation issues. Keep the probing tool, target IP, and probing port consistent to ensure comparability.

Question 4: What are the common abnormal patterns in actual monitoring, and how can one determine whether it is a link issue or an application-side problem?

Abnormality Detection and Localization Methods

Common patterns include sudden packet loss accompanied by rising latency (typical link congestion), short-term spikes in latency with low packet loss (possibly due to routing detours or intermediate queue jitter), and persistent packet loss occurring over multiple hops (possibly due to ISP or undersea cable issues). Judgment should be made by comparing multiple points: If there is a significant increase in delays/packet loss from the domestic side to Singapore, then the problem lies at the exit point or in Singapore’s network ； If the connection is normal up to that point but deteriorates after entering the U.S. side, it may be a problem with the U.S. side or the trans-Pacific cable. Check both the BGP change log and link utilization to determine whether it is due to a route switch or bandwidth saturation.

Question 5: What emergency and long-term optimization measures can be taken when performance degradation is detected due to holiday peaks?

Emergency measures: Temporarily adjust BGP priorities, enable alternative direct connections or routes via other transit points (for example, to avoid congested Singapore exchange points), and use traffic throttling or CDN acceleration for critical services to reduce pressure on core links. Long-term optimization: Negotiate with upstream operators to increase outbound capacity or priority (improve CN2 (Peer-to-peer strategy): Deploy more monitoring points and establish automatic alerting and traffic fallback strategies. Regularly conduct traffic forecasting and capacity planning for holidays. Additionally, it is recommended to optimize queue and caching policies on routers and firewalls to reduce jitter.