Rate Limit
Setup
In the setup that has been used for the
tests between StarLight and the
Amsterdam Science Park, also some
pilot rate limit tests have been executed. Therefore, at the Amsterdam Force10
switch a rate limit of 2800 Mbits/s has been configured with the following
configuration command:
rate limit 2800 50 peak 2800 50 vlan VlanID
This implies that a commited-rate of 2800 Mbits/s with a burst of
50 KBytes and also a peak-rate of 2800 Mbits/s again with a
burst of 50 KBytes has been configured for that interface but limited to
the VLAN with ID VlanID.
Performed Experiments
In the tests presented below the influence of the configured rate limit in the
direction ASP -> SL upon the test results will be
compared with the results obtained for the unlimited direction
SL -> ASP. Besides the usual, standard TCP and UDP
bulk test flows, also TCP and UDP tests will be executed where the bandwidth of
these flows are shaped as a function of the time using the triangle profile
shown in
.
This triangle profile has been used to check for possible hysteresis effects
between the areas where the bandwidth is going up and down.
|
BW | +--+
| | |
| +--+ +--+
| | |
| +--+ +--+
| | |
| +--+ +--+
| | |
+--------------------------
Time
|
| . |
|
Triangle bandwidth profile shaped as a function of
the time. |