H3C Technologies H3C SR8800 - Manual (Page 31)

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2. The destination affixes a time stamp to each packet that it receives, and then sends it back to the
source.
3. Upon receiving the response, the source calculates the delay jitter, which reflects network
performance. Delay refers to the amount of time it takes a packet to be transmitted from source to
destination or from destination to source. Delay jitter is the delay variation over time.
Configuration prerequisites
UDP jitter tests require cooperation between the NQA server and the NQA client. Before you start UDP
jitter tests, configure UDP listening services on the NQA server. For more information about UDP listening
service configuration, see “
Configuring the NQA server .”
Configuring UDP jitter tests
To configure UDP jitter tests:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter NQA test group view.
nqa entry admin-name
operation-tag
N/A
3. Configure the test type as UDP
jitter and enter test type view. type udp-jitter N/A
4. Configure the destination
address of UDP packets.
destination ip ip-address
By default, no destination IP
address is configured.
The destination IP address must be
the same as that of the listening
service on the NQA server.
5. Configure the destination port
of UDP packets.
destination port port-number
By default, no destination port
number is configured.
The destination port must be the
same as that of the listening service
on the NQA server.
6. Specify the source port
number of UDP packets.
source port port-number
Optional.
By default, no source port number
is specified.
7. Configure the size of the data
field in each UDP packet.
data-size size
Optional.
100 bytes by default.
8. Configure the string to be
filled in the data field of each
probe packet.
data-fill string
Optional.
By default, the string is the
hexadecimal number
00010203040506070809.
9. Configure the number of
probe packets to be sent
during each UDP jitter probe
operation.
probe packet-number
packet-number Optional.
10 by default.
10. Configure the interval for
sending probe packets during
each UDP jitter probe
operation.
probe packet-interval
packet-interval Optional.
20 milliseconds by default.