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NE20E-S2 V800R010C10SPC500 Feature Description - System Monitor 01

This is NE20E-S2 V800R010C10SPC500 Feature Description - System Monitor
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TWAMP Implementation Process

TWAMP Implementation Process

A Two-Way Active Measurement Protocol (TWAMP) test covers the establishment of a control session, establishment and start of a test session, and stop of the entire TWAMP session.

Establishment of a Control Session

A control session provides a basis for the establishment of a test session. Figure 7-4 shows how a control session is established.

  1. The server specifies a TCP port number (the default port number is 862), and the control-client initiates a TCP connection.
  2. The server replies with a Server-Greeting message to notify the control-client of the server configurations.
  3. After receiving the Server-Greeting message, the control-client sends a Set-Up-Response message to the server to establish a control session.
  4. The server verifies the Set-Up-Response message and replies with a Server-Start message.

A control session is established between the control-client and the server.

Figure 7-4 Establishment of a control session

Establishment of a Test Session

After a control session is established, users can specify an IP address and a UDP port number on the control-client to establish a test session. Figure 7-5 shows how a test session is established.

  1. The control-client sends a Request-TW-Session message carrying an IP address and a UDP port number to the server through the TCP connection.
  2. After receiving the Request-TW-Session message, the server establishes a test session based on the IP address and UDP port number in the Request-TW-Session message and replies to the control-client with an Accept-Session message.

A test session is established between the control-client and the server.

Figure 7-5 Establishment of a test session

Start of a Test Session

A test session is started based on a control session. After a test session is established, the control-client can send a Start-Session message to the server. After receiving the Start-Session message, the server instructs the control session to start all test sessions that are established based on the control session. Figure 7-6 shows how a test session is started.

  1. The control-client sends a Start-Session message to the server.
  2. After receiving the Start-Session message, the server notifies the session-reflector of the test session information to enable the session-reflector to respond to probes.
  3. The session-reflector replies to the control-client with a Start-ACK message to start the test sessions.
  4. After receiving the Start-ACK message, the control-client notifies the session-sender of the test session information to enable the session-sender to send probes.

Test sessions are started, and the session-reflector starts to respond to probes.

Figure 7-6 Start of a test session

Stop of a TWAMP Session

After statistics are collected, users can stop a TWAMP session. Figure 7-7 shows how a TWAMP session is stopped.

  1. The control-client sends a Stop-Session message to instruct the server to stop collecting statistics.
  2. After receiving the Stop-Session message, the server disables the session-reflector from responding to probes in a TWAMP session.

The TWAMP session is stopped.

Figure 7-7 Stop of a TWAMP session

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Updated: 2019-01-02

Document ID: EDOC1100055478

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