H3C Technologies H3C SecPath F1000-E - Manual (Page 79)

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NOTE:
The TCP port number for the HTTP server must be 80 in an HTTP test. Otherwise, the test will fail.
Configuring a UDP Jitter Test
NOTE:
It is recommended not to perform an NQA UDP jitter test on known ports, namely, ports from 1 to 1023.
Otherwise, the NQA test will fail or the corresponding services of this port will be unavailable.
Real-time services such as voice and video have high requirements on delay jitters. With the UDP jitter
test, uni/bi-directional delay jitters can be obtained to judge whether a network can carry real-time
services.
Delay jitter refers to the difference between the interval of receiving two packets consecutively and the
interval of sending these two packets. The procedure of a UDP jitter test is as follows:
• The source sends packets at regular intervals to the destination port.
• The destination affixes a time stamp to each packet that it receives and then sends it back to the
source.
• Upon receiving the packet, the source calculates the delay jitter, and the network status can be
analyzed.
Configuration prerequisites
A UDP jitter test requires cooperation between the NQA server and the NQA client. Before the UDP jitter
test, make sure that the UDP listening function is configured on the NQA server. For the configuration of
the UDP listening function, see Configuring the NQA Server .
Configuring a UDP jitter test
Follow these steps to configure a UDP jitter test:
To do… Use the command… Remarks
Enter system view system-view —
Enter NQA test group view
nqa entry admin-name
operation-tag
—
Configure the test type as UDP jitter
and enter test type view
type udp-jitter Required
Configure the destination address
for a test operation
destination ip ip-address
Required
By default, no destination IP
address is configured for a test
operation.
The destination IP address must be
consistent with that of the existing
listening service on the NQA
server.