How to Start Temporally Ordered Routing Projects Using OMNeT++

To start a Temporally Ordered Routing (TOR) project using OMNeT++ which replicating a network in which routing decisions are according to the time or event sequences. This type of routing is frequently utilised within scenarios in which the routing decisions are created based on a certain temporal order or time-based criteria like time-sensitive data flows, event-based routing, or proactive routing decisions.

What is Temporally Ordered Routing?

Temporally Ordered Routing (TOR) routing scheme denotes the decisions are according to the network topology, however time-ordered events or time-related limitations. It should execute in real-time applications, event-driven networks, or systems in which routing decisions made based on the timestamps, scheduled events, or time-of-day rules.

We can be utilised OMNeT++ for replicating and envisioning the systems. OMNeT++ doesn’t directly support for TOR, but we can be executed it with the support of custom modules and logic according to the event timing, scheduled tasks, or time-based packet routing.

Steps to Start Temporally Ordered Routing (TOR) Simulation in OMNeT++

Step 1: Set Up OMNeT++ and INET

Make sure that we have OMNeT++ and the INET Framework installed on the system, since it support network and routing models, which can prolong for Temporally Ordered Routing.

  1. Install OMNeT++:
    • We should download and install  the new version of OMNeT++ on the system.
  2. Install INET Framework:
    • The INET offers networking protocols and modules with routers, hosts, and network applications. We can be prolong this framework for executing TOR.
    • We can install INET by copying it through INET GitHub repository or utilising the OMNeT++ module manager.

Step 2: Create a New OMNeT++ Project for TOR

  1. Create a New OMNeT++ Project:
    • Go to OMNeT++ IDE and then make a new project by navigating File > New > OMNeT++ Project. Name it to the project as TemporallyOrderedRouting.
  2. Define Your Network Topology:
    • Create a network topology with routers, hosts, and connections. These will be containing the nodes in the network, which will make routing decisions depends on time.
    • Make a simple topology with a network that containing three routers and two hosts, and then we will beexecuted the temporally ordered routing logic.

Example of a simple network topology:

network TemporallyOrderedRoutingNetwork {

submodules:

router1: Router;

router2: Router;

router3: Router;

host1: Host;

host2: Host;

connections:

host1.ethg++ <–> EthernetInterface <–> router1.ethg++;

router1.ethg++ <–> EthernetInterface <–> router2.ethg++;

router2.ethg++ <–> EthernetInterface <–> router3.ethg++;

router3.ethg++ <–> EthernetInterface <–> host2.ethg++;

}

In this case:

  • The network includes router1, router2, and router3, and host1 and host2 are the endpoints.
  • Then, we can be prolonged the topology if required for use case such as integrating additional routers or hosts.

Step 3: Define Temporally Ordered Routing Logic

In OMNeT++, we need to describe how routing decisions are created according to the time for executing Temporally Ordered Routing. Following is some basic methods:

  1. Time-based Packet Scheduling:
  • Choose once packets should be routed with a certain route to utilise time intervals or timestamps. It is frequently utilised within applications, which need real-time information or event-driven routing.

For instance, we should be described the behaviors of routing, which may modify based on whether the present time is in specific ranges.

  1. Use Self-Messages for Time-based Events:
  • OMNeT++ provides self-message that permit to schedule events. We can be utilised these self-messages causing time-based routing decisions.

Example of scheduling a self-message modifying the behavior of routing at a particular time within a router module:

class TimeBasedRouter : public cSimpleModule {

private:

cMessage *routeChangeEvent;

protected:

virtual void initialize() override {

routeChangeEvent = new cMessage(“RouteChangeEvent”);

scheduleAt(simTime() + 10, routeChangeEvent);  // Schedule event after 10 seconds

}o

virtual void handleMessage(cMessage *msg) override {

if (msg == routeChangeEvent) {

// Perform routing changes after 10 seconds

EV << “Routing change at time ” << simTime() << endl;

changeRouting();  // Implement the logic to change routing here

}

}

void changeRouting() {

// Implement the logic to alter routing tables or paths here

// You can update the routing table or reconfigure paths based on time

}

};

In this case:

  • The router module (TimeBasedRouter) arranges a route change event later than 10 seconds.
  • Once the event happens then the router modifies the routing path or their behavior.
  1. Time-Dependent Routing Decisions:
  • We will want to switch the routing algorithm such as from shortest-path routing to time-dependent routing depends on the present time of network.
  • We need to make a routing table in which each entry contains time-dependent weight or metric, and then rely on the current time, router choose routes.

For instance, we need to select the route including least delay within a time-sensitive network during specific hours, or else a path with higher bandwidth in the course of peak times.

Step 4: Implement Routing and Event-Based Logic

We can inscribe code, which manages the routing decisions according to the time intervals, events, or conditions for replicating temporally ordered routing. We can carry out this by means of influencing the routing tables, path selections, and timing events.

Example of simple routing decision logic according to the time:

class TemporallyOrderedRouter : public cSimpleModule {

private:

cMessage *routingEvent;

protected:

virtual void initialize() override {

routingEvent = new cMessage(“RoutingEvent”);

scheduleAt(simTime() + 5, routingEvent);  // Schedule event to change routing in 5 seconds

}

virtual void handleMessage(cMessage *msg) override {

if (msg == routingEvent) {

// After 5 seconds, adjust the routing

EV << “Adjusting routing due to time-based decision at time ” << simTime() << endl;

adjustRouting();

}

}

void adjustRouting() {

// Logic to adjust the routing path or reconfigure network connections based on time

}

};

In this instance:

  • The TemporallyOrderedRouter module uses a self-message to schedule routing changes after 5 seconds.
  • The adjustRouting() method contains the logic to dynamically change routing paths based on the time-based event.

Step 5: Configure the Simulation in omnetpp.ini

We set the simulation to define the network and metrics like event timings and the routers behavior using omnetpp.ini file.

Example configuration:

network = TemporallyOrderedRoutingNetwork

sim-time-limit = 60s

[Config TOR]

*.router1.routingProtocol = “TimeBasedRouter”

*.router2.routingProtocol = “TimeBasedRouter”

*.router3.routingProtocol = “TimeBasedRouter”

# Set custom time intervals for routing events

*.router1.routingEvent.scheduleAt = 10s

*.router2.routingEvent.scheduleAt = 15s

*.router3.routingEvent.scheduleAt = 20s

In this set up:

  • The routers are set with the support of TimeBasedRouter logic.
  • Custom scheduling is configured in diverse routers for managing events at various times that is after 10, 15, and 20 seconds.

Step 6: Run the Simulation

  1. Compile the Project:
    • In OMNeT++ IDE, select Build option to compile the project in the system.
  2. Start the Simulation:
    • Utilise Tkenv or Qtenv which is OMNeT++ graphical interfaces to execute the simulation and envision how the temporally ordered routing performs.
  3. Monitor the Network and Routing:
    • We have to monitor the routing decisions to be made at certain times and make sure that the routers are modifying its routes according to the scheduled events if required.
  4. Debugging:
    • Record messages and envision the routing changes to utilise the EV macro within the OMNeT++ log files. It will support to debug and observe the real time routing decisions.

Example of logging:

EV << “Routing updated at time ” << simTime() << “. New path selected.” << endl;

Step 7: Test and Optimize the Simulation

  1. Introduce Failures:
    • We need to replicate the network failures (link failures or router crashes) and then monitor how the routing decisions modify depends on the specific time.
  2. Extend the Simulation:
    • Depends on the time, we integrate additional routers, hosts, and complex routing rules like dynamic adjustments of bandwidth, path selection according to the time-of-day, or event-based routing mechanisms.
  3. Analyze Performance:
    • We estimate the temporally ordered routing’s performance like convergence time, overhead, and time-based routing decisions effectiveness.

Conclusion

To execute the Temporally Ordered Routing (TOR) that needs to describe routing logic, is handled by time or scheduled events using OMNeT++. In router modules, we can be replicated routing decisions depends on the time intervals, timestamps, or event sequences to utilise self-messages and custom logic of OMNeT++. We can experiment this method within basic network topology and also we monitor how the routing decisions adjust rely on the time. We can prolong this simulation for designing real-time, time-sensitive, or event-driven network systems.

In this manual, we had presented in-depth insights about how to start and replicate the Temporally Ordered Routing projects and how to execute and enhance the simulation using OMNeT++ environment. We can ready to offer essential information on this subject as needed.

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