[ndnSIM] link failure

[Alex Afanasyev]

> On Apr 28, 2015, at 3:37 AM, Trade <trade20122012 at gmail.com> wrote:
> 
> Christian,
> Thanks for bringing good point. I did notice there are different ways for handling link failures.
> In NLSR implementation as well as published paper, they use taking one node down
> instead of link fails. But in Ndnsim, uses the link down but two nodes still can communicate
> with others.

Just to add one puzzle piece to the picture:  NS-3 as of yet does not support concept of removing node from the simulation environment, nor remove/physically break any specific link.  That is main reason why link failures in LinkHelper are implemented as adding 100% LossError model on the link.


> One more question, in ndnsim example, both bestroute and calculateallpossible route appear
> in the main file, then does it account for ?

Trade, I’m not sure I fully understand your question.  Can you clarify what you mean?

—
Alex

> On 4/27/15 12:34 AM, Christian Kreuzberger wrote:
>> As far as I know, Link failures are, as per the name, LINK failures, and not
>> node failures.
>> This means that in theory two nodes can still communicate via alternate
>> routes.
>> 
>> However, this behaviour depends on the forwarding strategy you use. If you
>> are using ndnSIM 2.0 + NFD with BestRoute, you might not be able to
>> experience this behaviour, if you use Broadcast +
>> CalculateAllPossibleRoutes() you should see the behaviour.
>> 
>> For examples see
>> 
>> http://ndnsim.net/2.0/helpers.html#link-control-helper
>> 
>> and
>> 
>> http://ndnsim.net/2.0/examples.html#simple-scenario-with-link-failures
>> 
>> 
>> 
>> 
>> 
>>> -----Original Message-----
>>> From: ndnSIM [
>>> mailto:ndnsim-bounces at lists.cs.ucla.edu
>>> ] On Behalf Of
>>> Trade
>>> Sent: Sunday, April 26, 2015 2:00 AM
>>> To:
>>> ndnsim at lists.cs.ucla.edu
>>> 
>>> Subject: [ndnSIM] link failure
>>> 
>>> Does link failure refer to only one node down or "the link down but two
>>> nodes still can transmit message to other neighbors"?  Which one is the
>>> 
>> case
>> 
>>> in ns3 or ndnsim?
>>> 
>>> Thanks
>>> 
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>>> ndnSIM mailing list
>>> 
>>> ndnSIM at lists.cs.ucla.edu
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> 
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