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NE40E V800R010C10SPC500 Feature Description - System Monitor 01

This is NE40E V800R010C10SPC500 Feature Description - System Monitor
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).



Ping process

A source sends an Internet Control Message Protocol (ICMP) Echo Request message to a specified IP address (the destination). Upon receipt, the destination replies with an ICMP Echo Reply message. If the source receives the ICMP Echo Reply message within a specified period, the destination is reachable. If the source does not receive the ICMP Echo Reply message within a specified period, it considers the destination unreachable and displays a message indicating ping operation timeout.

In a ping operation, the identifier of an ICMP message is used as the ping process ID. Each ICMP Echo Reply message is mapped to each ping process.

The ping command labels each ICMP Echo Request message with a sequence ID that starts from 1 and increases by 1 at a time. The number of ICMP Echo Request messages to be sent varies in different processes. By default, a device sends five ICMP Echo Request messages at a time. If the destination is reachable, the source can receive five ICMP Echo Reply messages that have sequence numbers corresponding to those of ICMP Echo Request messages. The number of ICMP Echo Request messages can be set. If the TTL value of a packet is reduced to 0 when the packet reaches the Device but not the destination, the Device replies with an ICMP TTL Expired in Transit message, indicating that the destination is unreachable.

Ping operation on trunk member interfaces

A ping operation can be performed on Layer 3 trunk interfaces (logical interfaces), in addition to physical interfaces.

A trunk interface is a logical interface with multiple physical interfaces bundled together. The transmission path of each trunk member interface varies, and the delay time, jitter time, and packet loss ratio of each trunk member interface are different. Therefore, if QoS performance of a trunk interface deteriorates, check for the faulty member interface. The ping operation on trunk member interfaces can meet this requirement and help users locate the faulty interfaces.

To monitor the link status of a trunk member interface from end to end, ICMP Echo Request and Reply messages must follow the link of the same trunk member interface. This means that on the destination, an ICMP Echo Reply message is sent to the source through the interface that receives the ICMP Echo Request message.


Tracert process

The source port first sends three UDP packets with the TTL value of 1 to a remote device. By default, the first packet uses port 33434 as the receive port on the target device. Port numbers in ascending order are used to send the following packets. For example, the second packet uses port 33435 as the receive port, and the third packet uses the port numbered 33436 as the receive port. The TTL value of 1 causes the UDP packets to "timeout" as soon as the packets hit the first Device along the path; the Device then responds with an ICMP TTL Timeout message indicating that the UDP packets have expired. The source sends another three UDP messages, each with the TTL value of 2, which causes the second Device to reply with ICMP TTL Timeout messages. This process repeats until the UDP packets reach the destination of the path.

If these UDP packets are sent to an invalid port at the destination, ICMP Port Unreachable messages are returned, indicating that the port is unreachable and the tracert process has stopped. The tracert process collects information about the path along which packets travel to the destination.

The maximum TTL value for a UDP packet is 30. Each time no response is received within the configured timeout period, the source node displays messages indicating that the UDP packets expire. If TTL values in UDP packets expire, the destination is unreachable, and the tracert test fails.

Updated: 2019-01-03

Document ID: EDOC1100055050

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