Configuring a UDP-jitter Test

A UDP-jitter test measures the delay jitter of a network to determine whether the network can carry real-time services.

Context

The UDP-jitter test requires the cooperation between the NQA server and the NQA client. Before implementing the UDP-jitter test, you need to configure the UDP listening function on the NQA server.

The NTP configured for the NQA server and client can improve the test accuracy.

Procedure

Configure the NQA server.
1. Access the system view.
  system-view
2. Configure the address and port number of the UDP server.
  nqa-server udpecho [ vpn-instance vpn-instance-name ] ip-address port-number

Configure the NQA client.

Access the system view.
system-view
Create an NQA test instance and access the test instance view.
nqa test-instance admin-name test-name
Set the test type to UDP-jitter.
test-type jitter
Set the destination address.
destination-address ipv4 ip-address
Configure the destination port.
destination-port port-number

Optional: Configure other parameters for the UDP-jitter test.

Item	Command	Description
Configuring description of a test instance	description description-information	-
Configuring a tested VPN instance	vpn-instance vpn-instance-name	-
Setting the outbound interface for sending the test packet	source-interface [ interface-type interface-number ]	By default, the FW determines the outbound interface by querying the routing table. If there are multiple paths to the tested destination address, you can specify the source interface, so that test packets are forwarded along a specified path.
Setting the source IP address of test packets	source-address ipv4 ip-address	By default, no source IP address is specified for test packets. The packets use the primary IP address of the outbound interface as their source IP address. The specified source IP address must be the IP address of an Up interface on the FW. Otherwise, the test will fail.
Setting the payload size of test packets	datasize size	By default, the payload size is 100 bytes. When the value of datasize is set to 172, the payload of a packet contains 172 bytes. When the value of datasize is set to another value, the payload of a packet constantly contains 100 bytes.
Setting the padding field of test packets	datafill string	By default, the FW pads the payload using a fixed string. When datasize is set to 172, the first 100 bytes in the payload are fixed values and the subsequent types are circularly filled by the field specified by datafill.
Setting the TTL value of test packets	ttl value	The default value is 30.
Setting the ToS value of test packets	tos value	The default value is 0.
Setting the interval at which test packets are sent	interval { seconds interval \| milliseconds interval }	By default, UDP-jitter test packets are sent every 20 ms.
Configuring the number of packets sent in a single probe	jitter-packetnum number	By default, the number of packets sent in a single probe is set to 20.
Configuring the number of probes in a single test (one probe contains multiple continuously-sent probe packets, and the number of probe packets is determined by jitter-packetnum)	probe-count number	By default, one test initiates three probes. NOTE: The product of probe-count and jitter-packetnum cannot exceed 3000.
Setting the test interval	frequency interval	By default, no test interval is set, and the test runs only once.
Setting the probe failure percentage	fail-percent percent	The default probe failure percentage is 100%. That is, the test is considered failed only when all probes fail.
Setting the timeout for a single probe	timeout time	By default, the expiration time for a single probe in the UDP-jitter test is 3s.
Setting the maximum number of historical records	records history number	By default, there are a maximum of 50 historical records.
Setting the maximum number of test result records	records result number	By default, a maximum of five test results are recorded.
Setting the aging time of a test instance	agetime hh:mm:ss	The default value is 0. That is, test instances are never aged.
Configuring the system to send test packets without querying the routing table	sendpacket passroute	By default, the FW forwards the test packets based on the route queried in the routing table.

Start the NQA test.
start
Select one of the following start modes as required.
- Start the NQA test immediately.
  
  start now [ end { at [ yyyy/mm/dd ] hh:mm:ss | delay { seconds second | hh:mm:ss } | lifetime { seconds second | hh:mm:ss } ]
- Start the NQA test at a specified time point.
  
  start at [ yyyy/mm/dd ] hh:mm:ss [ end { at [ yyyy/mm/dd ] hh:mm:ss | delay { seconds second | hh:mm:ss } | lifetime { seconds second | hh:mm:ss } ]
- Start the NQA test after the delay of a specified period.
  
  start delay { seconds second | hh:mm:ss } [ end { at [ yyyy/mm/dd ] hh:mm:ss | delay { seconds second | hh:mm:ss } | lifetime { seconds second | hh:mm:ss } ]

Follow-up Procedure

On the NQA server, run the display nqa-server command to query the server information.

<FW> display nqa-server NQA Server Max: 100              NQA Server Num: 1 NQA Concurrent TCP Server: 0     NQA Concurrent UDP Server: 1 NQA Concurrent RTP-UDP Server: 0 NQA Concurrent RTP-TCP Server: 0     

nqa-server udpecho 1.1.1.1 6555 NOTINSERVICE

On the NQA client, run the display nqa results [ test-instance admin-name test-name ] command to query the test results.

<FW> display nqa results NQA entry(admin, jitter) :testflag is inactive ,testtype is jitter 1 . Test 1 result   The test is finished SendProbe:3000                       ResponseProbe:3000 Completion:success                   RTD OverThresholds number:0 Min/Max/Avg/Sum RTT:5/48/8/23008     RTT Square Sum:192244 NumOfRTT:3000                        Drop operation number:0 Operation sequence errors number:0   RTT Stats errors number:0 System busy operation number:0       Operation timeout number:0 Min Positive SD:1                    Min Positive DS:1 Max Positive SD:30                   Max Positive DS:39 Positive SD Number:765               Positive DS Number:728 Positive SD Sum:1553                 Positive DS Sum:775 Positive SD Square Sum:7873          Positive DS Square Sum:2299 Min Negative SD:1                    Min Negative DS:1 Max Negative SD:18                   Max Negative DS:38 Negative SD Number:726               Negative DS Number:723 Negative SD Sum:1557                 Negative DS Sum:776 Negative SD Square Sum:7569          Negative DS Square Sum:2246 Min Delay SD:0                       Min Delay DS:0 Avg Delay SD:3                       Avg Delay DS:3 Max Delay SD:39                      Max Delay DS:47 Packet Loss SD:0                     Packet Loss DS:0 Packet Loss Unknown:0                Average of Jitter:1 Average of Jitter SD:2               Average of Jitter DS:1 Jitter out value:1.0328811           Jitter in value:0.5140466 NumberOfOWD:3000                     OWD SD Sum:11523 OWD DS Sum:10065                     TimeStamp unit: ms Packet Rewrite Number: 0             Packet Rewrite Ratio: 0% Packet Disorder Number: 0            Packet Disorder Ratio: 0% Fragment-disorder Number: 0          Fragment-disorder Ratio: 0% Start time: 2016-01-26 10:54:00+08:00 End time: 2016-01-26 10:55:01+08:00

**Table 1** Description of the **display nqa results** command output
Item	Description
SendProbe	Number of sent test packets
ResponseProbe	Number of received response packets
Completion	Test completion state: success: The test is successful. no result: The test is running, and no result has been obtained. failed: The test fails.
RTD OverThresholds number	Number of times the RTD exceeds the specified threshold
Min/Max/Avg/Sum RTT	Minimum, maximum, average, and sum of the round trip time of the test packet
RTT Square Sum	Quadratic sum of the round trip time of the test packet
NumOfRTT	Number of RTTs
Drop operation number	Number of test packet sending failures
Operation sequence errors number	Number of received out-of-order packets
RTT Stats errors number	Number of RTT state errors
System busy operation number	Number of initialization or resource application failures
Operation timeout number	Number of expiration times in the test
Min Positive SD	Minimum positive jitter of the path from the source to the destination
Min Positive DS	Minimum positive jitter of the path from the destination to the source
Max Positive SD	Maximum positive jitter of the path from the source to the destination
Max Positive DS	Maximum positive jitter of the path from the destination to the source
Positive SD Number	Number of positive jitters of the path from the source to the destination
Positive DS Number	Number of positive jitters of the path from the destination to the source
Positive SD Sum	Sum of positive jitter values of the path from the source to the destination
Positive DS Sum	Sum of positive jitter values of the path from the destination to the source
Positive SD Square Sum	Quadratic sum of positive jitter values of the path from the source to the destination
Positive DS Square Sum	Quadratic sum of positive jitter values of the path from the destination to the source
Min Negative SD	Minimum negative jitter of the path from the source to the destination
Min Negative DS	Minimum negative jitter of the path from the destination to the source
Max Negative SD	Maximum negative jitter of the path from the source to the destination
Max Negative DS	Maximum negative jitter of the path from the destination to the source
Negative SD Number	Number of negative jitters of the path from the source to the destination
Negative DS Number	Number of negative jitters of the path from the destination to the source
Negative SD Sum	Sum of negative jitter values of the path from the source to the destination
Negative DS Sum	Sum of negative jitter values of the path from the destination to the source
Negative SD Square Sum	Quadratic sum of negative jitters of the path from the source to the destination
Negative DS Square Sum	Quadratic sum of negative jitters of the path from the destination to the source
Min Delay SD	Minimum delay of the path from the source to the destination
Min Delay DS	Minimum delay of the path from the destination to the source
Avg Delay SD	Average delay of the path from the source to the destination
Avg Delay DS	Average delay of the path from the destination to the source
Max Delay SD	Maximum delay of the path from the source to the destination
Max Delay DS	Maximum delay of the path from the destination to the source
Packet Loss SD	Maximum number of lost packets on the path from the source to the destination
Packet Loss DS	Maximum number of lost packets on the path from the destination to the source
Packet Loss Unknown	Number of lost packets in an unknown direction
Average of Jitter	Average jitter
Average of Jitter SD	Average jitter of the path from the source to the destination
Average of Jitter DS	Average jitter of the path from the destination to the source
Jitter out value	Jitter of the path for sending packets
Jitter in value	Jitter of the path for receiving packets
NumberOfOWD	Number of one-way-delay packets
OWD SD Sum	Sum of unidirectional delay of the path from the source to the destination
OWD DS Sum	Sum of unidirectional delay of the path from the destination to the source
TimeStamp unit	Timestamp unit
Packet Rewrite Number	Number of rewritten packets
Packet Rewrite Ratio	Proportion of rewritten packets
Packet Disorder Number	Number of out-of-order packets
Packet Disorder Ratio	Proportion of out-of-order packets
Fragment-disorder Number	Number of out-of-order packets generated upon fragmentation
Fragment-disorder Ratio	Proportion of out-of-order packets generated upon fragmentation
Start time	Test start time
End time	Test end time