VeEX MPA, User Manual

Page: 607 / 842

Protocol Tabs
607
•
The maximum Burst Size allowed dynamically changes based on the last Frame
Size setting to be saved.
Example :
•
A 1GigE stream configured for a Frame Size of 128 bytes has a maximum Burst
Size of 844594 PPS.
•
When the Burst Size is set to 844594, this generates a burst of exactly 844594
packets, at 100% bandwidth for a full 1 second, with the minimum Inter-Packet
Gap between each packet, regardless of the Rate setting.
•
The Burst Size can be thought of as the amount of time that the burst of 100%
BW is "On", up to 1 second for the maximum allowed burst size.
•
A Burst Size of 1/2 the max (422297 for 1Gbps) would generate 100% bandwidth
for 1/2 a second, then the amount of "Off" time would depend on the Rate
setting.
•
The Rate is the "ratio of time" that packets are "On" for (100% BW), versus "Off"
for (0% BW).
•
If the Rate is set to 50%, then the burst of 100% BW would last for the same
amount of time as the 0% BW.
•
The greater the Rate, the shorter the "Off" time. The lower the Rate, the greater
the "Off" time.
Constant Burst Setup :
1. Turn OFF the test Stream(s) and press the Restart button to clear any packet
count history.
2. Next turn ON the test Stream(s) that are configured for Burst Mode, as described
above.
3. Monitor the network device under test (DUT) for anomalies, as the bursts of
generated packets are received.
4. Turn OFF
the test Stream(s) and verify that the DUT’s RX Packet count and the
TX Packet count match.
Single Burst Setup:
MPA_e_manual_D07-00-129P_RevA00