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H3C Technologies H3C MSR 5600 User Manual

Page 29

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16

Jitter means inter-packet delay variance. A UDP jitter operation measures unidirectional and

bidirectional jitters so that you can verify whether the network can carry jitter-sensitive services such as
real-time voice and video services.
The UDP jitter operation works as follows:

1.

The NQA client sends UDP packets to the destination port at a regular interval.

2.

The destination device takes a time stamp to each packet that it receives, and then sends the
packet back to the NQA client.

3.

Upon receiving the responses, the NQA client calculates the jitter according to the time stamps.

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 operation is
created.

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 that 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 must be the

same as that of the listening service
on the NQA server.

6.

(Optional.) Specify the source
port number of UDP packets. source port port-number

By default, no source port number
is specified.

7.

Specify the payload size in
each UDP packet.

data-size size

The default setting is 100 bytes.

8.

Specify the string to be filled

in the payload of each UDP

packet.

data-fill string

The default setting is the
hexadecimal number

00010203040506070809.

9.

Specify the number of UDP
packets sent in one UDP jitter

operation.

probe packet-number
packet-number

The default setting is 10.

10.

Configure the interval for

sending UDP packets.

probe packet-interval
packet-interval

The default setting is 20
milliseconds.

11.

Specify how long the NQA
client waits for a response

from the server before it

regards the response times
out.

probe packet-timeout
packet-timeout

The default setting is 3000
milliseconds.

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