H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 589)

63-10
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:
z
The source sends packets at regular intervals to the destination port.
z
The destination affixes a time stamp to each packet that it receives and then sends it back to the
source.
z
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.
Configuring the UDP-jitter test
Follow these steps to configure the 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.
Configure the destination port for a
test operation
destination port port-number
Required
By default, no destination port
number is configured for a test
operation.
The destination port must be
consistent with that of the existing
listening service on the NQA
server.
Specify the source port number for
a request
source port port-number
Optional
By default, no source port number
is specified.
Configure the size of a probe
packet sent
data-size size
Optional
100 bytes by default.
Configure the string of fill
characters of a probe packet sent
data-fill string
Optional
The string of fill characters of an
ICMP probe packet is the string
corresponding to the ASCII code
00 to 09 by default.
Configure the number of
consecutive packets in a UDP-jitter
probe
probe packet-number
packet-number
Optional
10 by default.
Configure the interval for sending
consecutive packets probe packet-interval
packet-interval
Optional
20 milliseconds by default.