Configuring a UDP Jitter Test Instance

Context

When configuring a UDP Jitter test instance, configure reachable routes between the UDP Jitter client and the UDP Jitter server.

You can set the number of packets to be sent consecutively in each test instance. This configuration is used to simulate certain traffic. For example, G.711 traffic can be simulated within 1 minute by sending 3000 UDP packets at an interval of 20 milliseconds.

If the clocks at the client and server are not synchronized, the result of unidirectional jitter test will be inaccurate. Configuring NTP on the client and server can effectively improve test result accuracy.

The NQA client also functions as the UDP Jitter client. The jitter obtained in this test is the UDP Jitter. Perform the following steps on the NQA client.

In the load balancing scenario, unidirectional UDP Jitter test is not supported.

When a link aggregation interface is used as the outbound interface of a route, the unidirectional UDP Jitter test result will be inaccurate if the member interfaces of the link aggregation interface change.

When a VLANIF interface is used as the outbound interface of a route, the unidirectional UDP Jitter test result will be inaccurate if the physical interfaces of the VLANIF interface change.

Procedure

Configure the UDP Jitter server.
1. Run system-view
  The system view is displayed.
2. Run nqa-server udpecho [ vpn-instance vpn-instance-name ] ip-address port-number
  The monitoring IP address and port number of the UDP server are configured.
Configure the NQA client.
1. Run system-view
  The system view is displayed.
2. (Optional) Run nqa-jitter tag-version version-number
  The version number is configured for UDP Jitter packets.
  
  By default, the version number of UDP Jitter test packets is 1.
  
  After setting the version number of the UDP Jitter test packets to 2 and enabling the NQA client to collect statistics about packet loss in one direction, you can view the number of lost packets on the link from the source to the destination, from the destination to the source, or from unknown directions. Based on these statistics, you can easily locate network faults and detect malicious attacks.
3. Run nqa test-instance admin-name test-name
  An NQA test instance is created, and the NQA view is displayed.
4. Run test-type jitter
  The test type is set to UDP Jitter.
5. Run destination-address ipv4 ipv4-address
  The destination address is configured.
6. Run destination-port port-number
  The destination port number is configured.
7. (Optional) Run the following commands as required to configure parameters for the UDP Jitter test:
  - Run description string
    
    A description is configured for the test instance.
  - Run frequency interval
    
    The test period is set for the NQA test instance.
  - Run timeout time
    
    The timeout period of a probe is set for the NQA test instance.
  - Run source-address ipv4 ipv4-address
    
    The source IP address is configured.
  - Run source-port port-number
    
    The source port number is configured.
  - Run ttl number
    
    The TTL value in the NQA test packet is set.
  - Run datasize size
    
    The packet size is set for the NQA test instance.
  - Run datafill fillstring
    
    The padding field is configured for the NQA test instance.
  - Run source-interface interface-type interface-number
    
    The source interface that sends test packets is configured.
  - Run sendpacket passroute
    
    The NQA test instance is configured to send packets without searching the routing table.
    
    By default, the NQA test packets are sent with searching the routing table.
  - Run probe-count number
    
    The number of probes in each test is set.
    
    By default, the number of probes is 3.
  - Run tos value
    
    Type of Service (TOS) is set for the test packet.
  - Run fail-percent percent
    
    The failure percentage is set for the NQA test instance.
    
    By default, the failure percentage is 100%, that is, the test is regarded failed only when all the probes fail.
  - Run interval { milliseconds interval | seconds interval }
    
    The interval at which test packets are sent is set.
    
    A shorter interval enables a test to be complete sooner. Delays occur during the sending and receiving of test packets on the processor. Therefore, if the interval for sending test packets is short, the UDP Jitter test results are inaccurate.
  - Run jitter-packetnum number
    
    The number of test packets sent in each probe is set.
    
    By default, 20 packets are sent each time in each test.
    
    The UDP Jitter test is used to collect and analyze the delay variation during the UDP packet transmission. To improve the accuracy of the test result, the system sends multiple test packets each time. The more test packets are sent, the more accurate the statistics are, and the longer the test lasts.
    
    The probe-count command sets the number of UDP Jitter probes and the jitter-packetnum command sets the number of test packets sent during each probe. The product of probe count multiplied by the number of test packets must be less than or equal to 3000.
  - Run vpn-instance vpn-instance-name
    
    The VPN instance name is configured.
  - Run records history number
    
    The maximum number of historical records is set for the NQA test instance.
  - Run records result number
    
    The maximum number of result records is set for the NQA test instance.
  - Run agetime hh:mm:ss
    
    The aging time is set for the NQA test instance.