[ndnSIM] Best Route acting weird

[Muhammad Hosain Abdollahi Sabet]

​Hi there,

I was trying to show the impact forwarding plane and forwarding strategy in
failure detection with a simple scenario in ndnSIM:

  ndn::FibHelper::AddRoute(nodes.Get(0),ndn::Name("/prefix"),
> nodes.Get(2),1);
>   ndn::FibHelper::AddRoute(nodes.Get(1),ndn::Name("/prefix"),
> nodes.Get(2),20);
>   ndn::FibHelper::AddRoute(nodes.Get(0),ndn::Name("/prefix"),
> nodes.Get(1),20);
>
>   ndn::StrategyChoiceHelper::Install(nodes.Get(0), ndn::Name("/prefix"),
> "/localhost/nfd/strategy/best-route");
>
>   // Consumer
>   ndn::AppHelper consumerHelper("ns3::ndn::ConsumerCbr");
>   consumerHelper.SetPrefix("/prefix");
>   consumerHelper.SetAttribute("Frequency", StringValue("1"));
>   consumerHelper.Install(nodes.Get(0));
>
>   // Producer
>   ndn::AppHelper producerHelper("ns3::ndn::Producer");
>   producerHelper.SetPrefix("/prefix");
>   producerHelper.SetAttribute("PayloadSize", StringValue("1024"));
>   producerHelper.Install(nodes.Get(2));
>
>   Simulator::Schedule(Seconds(3.0), ndn::LinkControlHelper::FailLink,
> nodes.Get(0), nodes.Get(2));
>   Simulator::Schedule(Seconds(15.0), ndn::LinkControlHelper::UpLink,
> nodes.Get(0), nodes.Get(2));
>

It works fine at first and detects the failure so tries with the other face
from 4s to 8s. But After 9s, Consumer tries sending interest while nfd does
not send it:

9s 0 ndn.Consumer:SendPacket()
> 9s 0 ndn.Consumer:SendPacket(): [INFO ] > Interest for 6
> 9s 0 ndn.Consumer:WillSendOutInterest(): [DEBUG] Trying to add 6 with
> +9000000000.0ns. already 0 items
> 10s 0 ndn.Consumer:SendPacket()
> 10s 0 ndn.Consumer:SendPacket(): [INFO ] > Interest for 7
> 10s 0 ndn.Consumer:WillSendOutInterest(): [DEBUG] Trying to add 7 with
> +10000000000.0ns. already 1 items
> 10.6s -1 ndn.Consumer:OnTimeout(6)
> 11s 0 ndn.Consumer:SendPacket()
> 11s 0 ndn.Consumer:SendPacket(): [INFO ] > Interest for 6
> 11s 0 ndn.Consumer:WillSendOutInterest(): [DEBUG] Trying to add 6 with
> +11000000000.0ns. already 1 items
>

 As soon as UpLink event, consumer tries with the first face and retrieves
data. Why is that? Is it a kind of bug in nfd?

Thanks,
Sabet
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