Path Analysis Window
For many large networks, when a tunnel is rerouted due to a network failure, the new path remains in use even when the network failure is resolved. Thus, after an extended period of time, a suboptimal set of paths might evolve in the network.
To re-establish an optimal set of paths for a network in this situation, the NorthStar Controller has the Path Analysis feature.
To use the Path Analysis feature, you must first have a network project loaded. The NorthStar Controller finds the optimal placement of tunnels using the current set of nodes and links in the network.
From the Juniper NorthStar Planner window, select Application > Path Analysis. The Path Analysis window is displayed as shown in Figure 1.
Table 1 lists the fields in the Path Analysis window.
Table 1: Path Analysis Window Fields
The name of the tunnel.
The name or IP address of the ingress node.
The name or IP address of the egress node.
The bandwidth of the tunnel.
The original administrative weight.
The best possible administrative weight for the tunnel if there are no other tunnels in the network.
Best AW Gain
The difference between the Orig AW and the Best AW.
The optimal administrative weight for the tunnel, taking into account the other tunnels in the network.
The difference between the Orig AW and the New AW.
The original path of the tunnel.
The best possible path of the tunnel if there are no other tunnels in the network.
The optimal path for the tunnel, taking into account the other tunnels in the network.
The Type field is used by the NorthStar Controller to identify properties of the LSP such as PCC delegated, PCC initiated, or externally-controlled.
To optimize all LSPs displayed in the Path Analysis table, select Optimize > Optimize All. To optimize selected LSPs displayed in the Path Analysis table, select Optimize > Optimize Selected. To highlight the selected LSPs in the topology map and display the Paths window, click View Paths. In the Paths window, you can toggle the Highlight: All Paths or Highlight None selection.
After performing path analysis, select View Changes > View Summary to display a summary of the path analysis results. Select View Changes > View Link Changes to display a list of link changes. Select View Changes > View LSP Changes to display a list of path changes.
To see the options that control how path analysis operates, select Options. The Path Analysis Options dialog box is displayed as shown in Figure 2.
In the Path Analysis Options window, you can set the Placement Order options for the Path Analysis feature to use the following:
The path analysis Placement Order option is set by selecting Tools > Options and then selecting Path Placement. Selecting the placement order from the drop-down menu in the Path Analysis Options dialog box has no effect.