Symptom

The bandwidth size configured when you buy a dedicated or shared bandwidth is the upper limit of the outbound bandwidth. If web applications that depend on the Internet freeze, check whether the dedicated bandwidth of the EIP bound to the ECS is greater than the configured bandwidth size.

If the bandwidth exceeds the configured bandwidth size, packet loss may occur. To ensure normal service running, it is recommended that you monitor the bandwidth.

Troubleshooting

The following fault causes are sequenced based on their occurrence probability.

If the fault persists after you have ruled out a cause, check other causes.

Figure 1 Troubleshooting

System Processes Leading to High Bandwidth

If system processes leading to excessively high bandwidth or CPU usage, your ECS will run slowly or be inaccessible unexpectedly

You can visit the following links to locate the processes that lead to excessively high bandwidth or CPU usage, and optimize or stop the processes.

• Troubleshooting High Bandwidth or CPU Usage of a Windows ECS
• Troubleshooting High Bandwidth or CPU Usage of a Linux ECS

Improper Cloud Eye Alarm Rules

When you create alarm rules for bandwidths on the Cloud Eye console, if the maximum outbound bandwidth or the alarm period is set too small, the system will send alarms indicating that the bandwidth exceeds the threshold too frequently.

Solution 1: Create a proper bandwidth alarm rule.

You need to set an appropriate alarm rule based on your purchased bandwidth. For example, if your purchased bandwidth is 5 Mbit/s, you can create an alarm rule to report an alarm when the maximum outbound bandwidth is greater than or equal to 4.8 Mbit/s in three consecutive periods. You can also increase your bandwidth.

1. Log in to the management console, under Management & Deployment, click Cloud Eye. On the Cloud Eye console, choose Alarm Management > Alarm Rules.
   Figure 2 Alarm Rules
   
2. Click Create Alarm Rule and configure an alarm rule to generate alarms when the bandwidth exceeds the limit.
   Figure 3 Creating an alarm rule
   

Solution 2: Configure the EIP bandwidth overflow event.

• EIP bandwidth overflow is available only in regions CN North-Beijing1, CN East-Shanghai2, and CN South-Guangzhou.
• The Event Monitoring page only displays EIP status. For details, see Cloud Eye User Guide.

1. Configure EIP bandwidth overflow.
   1. Log in to the management console, under Management & Deployment, click Cloud Eye. On the Cloud Eye console, choose Event Monitoring.
   2. Click Create Alarm Rule and configure an alarm rule to generate alarms when the EIP bandwidth exceeds the limit.
      Figure 4 Creating an alarm rule
      

      After the configuration, you can view the usage details of the EIP dedicated bandwidth on the Event Monitoring page when packet loss or shuttering occurs.

2. Query the historical dedicated bandwidth usage of an EIP.
   1. On the Cloud Eye console, click Event Monitoring.
      Figure 5 Event Monitoring
      
   2. Click View Event.
      Figure 6 View Event
      

      If the event EIP bandwidth overflow is not displayed, the dedicated bandwidth of the EIP does not exceed the limit.

      If the event EIP bandwidth overflow is displayed, the dedicated bandwidth of the EIP has exceeded the limit. To ensure stable service running, increase your bandwidth.

      You will not be charged for the Cloud Eye alarm function. If you enable SMN to send alarm notifications, this will incur standard usage charges for the SMN service. For details, see Cloud Eye User Guide.

Submitting a Service Ticket

If the problem persists, submit a service ticket.