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eSight V300R010C00SPC200, 300, and 500 Operation Guide 09

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Locating Faults

Locating Faults

When you receive service alarms during routine maintenance, you need to locate the fault using the diagnosis function provided by iPCA.


  • iPCA of the current version only applies to IP networks, and cannot be used on other types of networks, such as MPLS VPN.
  • If load balancing or Virtual Router Redundancy Protocol (VRRP) is deployed on the network, only the latest path of packets is displayed. That is, on a network with load balancing deployed, only the path where the currently transmitted packets pass through is displayed; on a network with VRRP deployed, only the path where the running service passes through is displayed.
  • If NAT is configured on a network, the source and destination IP addresses of packets are changed; therefore, the result of end-to-end service packet loss measurement may be inaccurate. In this situation, it is recommended that you deploy packet loss measurement on each segment before and after the IP addresses are translated. You can obtain the packet loss ratio of the entire service flow.


  1. Choose Topology > Topology Management from the main menu.

  2. Choose Quick Diagnose on the toolbar.

  3. After you select the source and destination devices, the Quick Diagnose dialog box is displayed.

  4. Select Real flow detection, set parameters, and click OK.
  5. Set the MAC addresses and VLAN IDs of the source and destination devices and click Detect Route to search service flows passing through the source device to the destination device.


    To show the packet loss ratio on a new path, you can change the path by changing the source and destination devices.

  6. After the service flow path is discovered, click Detect to show packet loss ratio on the path.

    If the service flow path is not discovered, eSight displays a prompt message, and you need to handle the problem according to the prompt message. The possible causes are as follows:

    • The MAC address and VLAN ID of the terminal are incorrect.
    • A device along the path does not support hop-by-hop detection.
    • A network exception occurs.

    The devices not supporting agile features are also displayed in the path discovery result. Agile devices refer to the devices supporting agile features. Currently, Huawei agile devices include S12700, S7700, and S5720HI. For details, see eSight Specification List.

    The measurement result shows the packet loss ratio on the service flow path.

Updated: 2019-09-12

Document ID: EDOC1100044378

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