Interactive Scenarios

Interactive Simulation allows you to specify the nodes, trunks, and/or facilities that he wants to fail for the simulation run. Subsequent failures can also be performed by continuing the simulation using a different set of failed elements.

Note: Before running an interactive simulation, review your failure simulation option settings via Tools > Options > Failure Simulation, and are described in detail in Failure Simulation Options.

Fail Link

Fails selected trunks in the network. In the Fail Links tab, a list of all trunks is displayed. To fail a link, simply select the row for a link. The link is grayed out on the map and marked with a red ‘F’ symbol to indicate its failure. To bring a trunk back up, select the failed trunk. 'Reset All' will bring all failed trunks up. Use the View Changes option to see how the failure impacts link utilization, and demand/tunnel routing.

Figure 103: Fail Links Window

Fail Interface

The purpose of this tab is to study the failure of a physical interface, which can have multiple logical links. For example, failing fe-0/1/2 on router ATL_TEST will cause 3 logical links associated with fe-0/1/2.0, fe-0/1/2.211, fe-0/1/242 to fail. Select the row for a physical interface to bring down or up the physical interface and associated logical links. ‘Reset All’ will bring all failed interfaces up. Use the View Changes option to see how the failure impacts link utilization, and demand/tunnel routing.

Fail Node

Fail selected nodes in the network. Use the View Changes option to see how the failure impacts link utilization, and demand/tunnel routing.

Figure 104: Fail Nodes Window

Fail Facility

Fail selected facilities in the network. A facility file must be defined and loaded in order to use this feature.

Use the View Changes option to see how the failure impacts link utilization, and demand/tunnel routing.

Run, Step, Stop

• Run is used to run a simulation with the given failures.
• Step is used to step through a simulation. A step consists of the rerouting of a single demand. For each step, a Paths window appears indicating the rerouted path (if any) and the disconnected path. This feature is applicable only when a running simulation has been stopped.
• Stop is used to stop a running simulation.

View Changes

The following changes can be viewed after performing the interactive simulation:

• View Link Changes: View changes to the link utilization and RSVP utilization
• View Demand Changes: View changes to the demand placement, number of hops, and delay (ms)
• View Tunnel Changes: View changes to the tunnel placement, number of hops, and delay (ms)

Reset Simulation

Reset the simulation to the initial network state. All trunks and nodes are set to active and all demands are routed according to the state at which the simulation mode was entered.