Dynamic Routing

[Amar Agrawal]

How to change the metric of node after 1s of simulation to send the packet from another path??

[Konstantinos]

What type of routing do you use at the moment to route the packets? 

[Amar Agrawal]

Sir I am using global routing to route the packets.

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[Konstantinos]

You can use the AddHostRouteTo to create a route to a specific IP.

I would suggest to remove the previous route first and then add the new. 

Example of creating a specific route (/examples/routing/static-routing-slash32) 

This is for static routing, but can be applied also in globalrouting because Ipv4GlobalRouting provides same methods.

In order to do that at a particular time, you need to use the Simulator::Schedule to create the event.

On Friday, March 28, 2014 9:48:53 AM UTC, Amar Agrawal wrote:

Sir I am using global routing to route the packets.

[Amar Agrawal]

Sir scenario is like this.

n1-------2-------n2-------3-----n3

|_____1_____n4____2___|

I have used setMetric() for all the nodes. 

So at the starting in simulation its going through path n1->n2->n3 

Now after simulation I am changing the metric between nodes n1n2 to 1 and n2n3 to 1

So this time it going through path n1->n4->n3.

now I want to do both the things in one simulation.

Sir please tell me what function should I use to do it.

[Konstantinos]

On Friday, March 28, 2014 10:05:32 AM UTC, Amar Agrawal wrote:

Sir scenario is like this.

n1-------2-------n2-------3-----n3

|_____1_____n4____2___|

I have used setMetric() for all the nodes. 

So at the starting in simulation its going through path n1->n2->n3 

Now after simulation I am changing the metric between nodes n1n2 to 1 and n2n3 to 1

So this time it going through path n1->n4->n3.

 

What do you mean AFTER the simulation ?

 

now I want to do both the things in one simulation.

Sir please tell me what function should I use to do it.

If you are using the SetMetric, then you can use this again.

Change the metric and re-calculate the routes using Ipv4GlobalRoutingHelper::RecomputeRoutingTables().

Using Simulator::Schedule() to do them after simulation has started.

[Amar Agrawal]

Simulator::Schedule(Seconds(2.0),SetMetric,n1n4,0,6);

Simulator::Schedule(Seconds(2.0),SetMetric,n1n4,1,6);

I am writing this code but i am getting error. What I am doing wrong here?

[Konstantinos]

Please refer to the ns-3 documentation for creating events and callbacks

http://www.nsnam.org/docs/manual/html/events.html

http://www.nsnam.org/docs/manual/html/callbacks.html

[Amar Agrawal]

Done!

Thank you sir for the links.