How Do I Know If My EIP Bandwidth Has Exceeded Its Limit?

Symptom

The bandwidth size configured when you buy a dedicated or shared bandwidth defines the maximum amount of outbound bandwidth supported. If an ECS running your web applications cannot be accessed smoothly from the Internet or the ECS experiences packet loss or access failures, check whether the used bandwidth of the EIP bound to the ECS is greater than the configured bandwidth size.

If the bandwidth exceeds the configured bandwidth size, there may be packet loss or remote login failures to the ECS. To ensure normal service running, it is recommended that you monitor the bandwidth.

Troubleshooting

Troubleshoot the issue by following the procedure described below. If the problem persists, submit a service ticket.

Figure 1 Troubleshooting procedure

1. Check whether the EIP bandwidth usage has exceeded the configured size.
   1. Check the monitoring data on the EIP bandwidth usage.

      Check whether the inbound bandwidth and outbound bandwidth usage has exceeded the amount purchased. For details, see How Can I Export Collected Data?

   2. Check the EIP bandwidth overflow event.

      For details about how to check the event, see checking the EIP dedicated bandwidth overflow history.

      If you have not configured EIP bandwidth overflow events, configure one by referring to configuring EIP bandwidth overflow events. If there is packet loss or access delay, you can view the EIP bandwidth overflow event on the Event Monitoring page.

   If the bandwidth usage goes too high for a little while but it does not interrupt your services, ignore the problem. If the bandwidth usage goes too high many times or if the issue lasts for a long time, fix the problem by referring to 2.

2. Perform the following operations if the EIP bandwidth usage has exceeded the configured size.

   Traffic surges may cause bandwidth usage to exceed the configured limit, resulting in packet loss.

   Check whether the sudden traffic surge is normal.

   • If the traffic surge is normal, increase the bandwidth. For details, see Modifying an EIP Bandwidth.
   • If the traffic surge is not normal, for example, the surge was caused by attacks, refer to System Processes Leading to High Bandwidth Usage.

3. Perform the following operations if the bandwidth usage has not exceeded the configured limit.
   After doing the checks in Step 1, if the bandwidth usage has not exceeded the configured limit or the purchased bandwidth:

   • Check whether Cloud Eye alarm rules are configured properly.

     If the alarm rules are not properly configured for bandwidth usage on the Cloud Eye console, the system may generate excessive alarms. You can refer to Improper Cloud Eye Alarm Rules to fix the problem.

   • Check whether the EIP connection has failed.

     If an ECS with an EIP bound cannot access the Internet, you can refer to Why Can't My ECS Access the Internet Even After an EIP Is Bound?

System Processes Leading to High Bandwidth Usage

If some heavy-duty system processes or applications running on your ECS are causing the high bandwidth or CPU usage, your ECS will run slowly or may unexpectedly be inaccessible.

You can refer to the following to locate processes that have led to excessively high bandwidth or CPU usage, and optimize or stop the processes.

• Windows: Why Is My Windows ECS Running Slowly?
• Linux: Why Is My Linux ECS Running Slowly?

Improper Cloud Eye Alarm Rules

If the alarm rules are not properly configured for bandwidth usage on the Cloud Eye console, the system may generate excessive alarms.

Submitting a Service Ticket

If the problem persists, submit a service ticket.