Configuring the UDP jitter operation
![[CAUTION: ]](images/caution.png) | CAUTION: To ensure successful UDP jitter operations and avoid affecting existing services, do not perform the operations on well-known ports from 1 to 1023. | |
Jitter means inter-packet delay variance. A UDP jitter operation measures unidirectional and bidirectional jitters. The operation result helps you to determine whether the network can carry jitter-sensitive services such as real-time voice and video services through the UDP jitter operation.
The UDP jitter operation works as follows:
The NQA client sends UDP packets to the destination port.
The destination device time stamps each packet it receives, and then sends the packet back to the NQA client.
Upon receiving the responses, the NQA client calculates the jitter according to the timestamps.
The UDP jitter operation requires both the NQA server and the NQA client. Before you perform the UDP jitter operation, configure the UDP listening service on the NQA server. For more information about UDP listening service configuration, see "Configuring the NQA server."
To configure a UDP jitter operation:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Create an NQA operation and enter NQA operation view. | nqa entry admin-name operation-tag | By default, no NQA operations exist. |
3. Specify the UDP jitter type and enter its view. | type udp-jitter | N/A |
4. Specify the destination address of UDP packets. | destination ip ip-address | By default, no destination IP address is specified. The destination IP address must be the same as the IP address of the listening service on the NQA server. |
5. Specify the destination port of UDP packets. | destination port port-number | By default, no destination port number is specified. The destination port number must be the same as the port number of the listening service on the NQA server. |
6. (Optional.) Specify the source IP address for UDP packets. | source ip ip-address | By default, the packets take the primary IP address of the output interface as their source IP address. The source IP address must be the IP address of a local interface, and the interface must be up. Otherwise, no UDP packets can be sent out. |
7. (Optional.) Specify the source port number of UDP packets. | source port port-number | By default, no source port number is specified. |
8. (Optional.) Set the payload size for each UDP packet. | data-size size | The default setting is 100 bytes. |
9. (Optional.) Specify the payload fill string for UDP packets. | data-fill string | The default payload fill string is the hexadecimal string 00010203040506070809. |
10. (Optional.) Set the number of UDP packets sent in one UDP jitter operation. | probe packet-number packet-number | The default setting is 10. |
11. (Optional.) Set the interval for sending UDP packets. | probe packet-interval interval | The default setting is 20 milliseconds. |
12. (Optional.) Specify how long the NQA client waits for a response from the server before it regards the response times out. | probe packet-timeout timeout | The default setting is 3000 milliseconds. |
![[NOTE: ]](images/note.png) | NOTE: Use the display nqa result or display nqa statistics command to verify the UDP jitter operation. The display nqa history command does not display the UDP jitter operation results or statistics. | |