NS-3.28 main-attribute-value.cc example outdated

[Aaron Burnie]

Hello,

While working through the NS-3 manual (completely new user) to understand how everything works I came across an issue with "main-attribute-value.cc" within the directory /ns-3.28/src/point-to-point/examples

Not sure on the history but I believe some queue attribute names have changed from older to newer versions which is creating runtime errors.

Error:

msg="Could not set default value for ns3::DropTailQueue<Packet>::MaxPackets", file=../src/core/model/config.cc, line=787

First lines of code creating the issue:

 Config::SetDefault ("ns3::DropTailQueue<Packet>::MaxPackets", StringValue ("80"));

 Config::SetDefault ("ns3::DropTailQueue<Packet>::MaxPackets", UintegerValue (80));

Solution:

Using the reference below, change the example file such that it uses current attributes.

https://www.nsnam.org/doxygen/main-attribute-value_8cc_source.html

Config::SetDefault ("ns3::QueueBase::MaxSize", StringValue ("80p"));

Config::SetDefault ("ns3::QueueBase::MaxSize", QueueSizeValue (QueueSize (QueueSizeUnit::PACKETS, 80)));

I have also attached the updated example file.

Furthermore, section "Defining Attributes" within the NS-3 manual needs updating to reflect the changes. 

[Tom Henderson]

Hi Aaron, thanks for bringing this to our attention.  Stefano has already updated this example program a couple of months ago in ns-3-dev, but I agree that it is outdated in the ns-3.28 release (I plan to make a small minor release to fix this and other issues).  I updated the documentation on both our ns-3-dev and ns-3.28 branches today, and the updated ns-3.28 documentation is on the website.

- Tom

[Aaron Burnie]

Thanks for the speedy reply and glad I could provide a small amount of feedback.

Aaron