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Spirent KB Article
Doc ID: FAQ18384
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Spirent TestCenter: What is the difference between Step and Burst Mode?
Environment/Versions
STC all releases
Traffic Generator
Step duration Mode
Burst duration Mode
Answer
This will be explained using a config with the following details:
10 stream blocks
Length of each increments by 1 bytes starting from 64 bytes
We can use this in the pcap to easily see what stream block is being tx/rx
BURST MODE:
Here we use a step of 9
We start the generator
Wait a few seconds (so that you can see a gap in the timestamp in Wireshark)
Start the generator again
Here is the resultant pcap
note how the 10th packet, which is the first one from step 4, is 64 bytes
This means the generator starts at the top of the stream blocks, that is, stream block with index 0
Step mode:
Here we use a step of 9
We start the generator
Wait a few seconds (so that you can see a gap in the timestamp in Wireshark)
Start the generator again
Here is the resultant pcap
note how the 10th packet, which is the first one from step 4, is 73 bytes.
This time the generator will start off where it left off after step 2
Also note that if you change any parameter in the generator, the starting point of the next “start generator” will be back at stream block index 0.
Version
1.0
Publish Date
2018-04-23
Categories
Product : Spirent TestCenter,Traffic Generation,Generator/Analyzer
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