You can set optimization parameters to relieve network congestion and augment capacity. You start by defining a maximum utilization threshold for a specified set of interfaces and then layering additional options that operate on Layer 3, Layer 1, and across failure sets.
Some of the optimizer options are mutually exclusive; for example, if you tell the optimizer to create port circuits, it cannot create parallel circuits at the same time. Other options are complementary; for example, you can specify the creation of parallel circuits and new adjacencies together.
Choose Tools > Capacity Planning Optimization
In the Layer 3 tab, define the maximum utilization threshold that you want to use for all interfaces in the network.
Decide on the Layer 3 optimization options to use. (Options are described in Table 1.)
You can upgrade all existing circuits or a subset of these circuits. If you want to allow the upgrade of just certain circuits, indicate those circuits to be modified. This is useful if you want to limit your upgrades to a certain geographical location in the network.
To create new port circuits or parallel circuits, choose one of the following options:
By default, the optimizer does not create new adjacencies. If you specify a set of candidate nodes for it to use, the optimizer proposes new adjacencies. The optimizer restricts a new adjacency between the specified candidate nodes. For example, you might require that only core nodes be directly connected. In this case, specify only core nodes as your candidate nodes. Additionally, you can impose a limit on the maximum number of new adjacencies that the optimizer creates.
To create new adjacencies:
Decrement (default): The metric of new interfaces is equal to the shortest path minus the value specified in the metric option.
Fixed: The metric of new interfaces is equal to the value specified in the Fixed Metric field.
(Optional) On the Advanced tab, choose options to provide additional capacity planning and describe the cost for the various elements in your design.
(Optional) On the Layer 3 tab, override the defaults for how circuits are tagged or for how new optimized plan files are named.
Click OK to create the capacity planning optimization reports.
WAE Design routes the traffic and looks at the utilization threshold you specified, and any other optimization parameters you specified. After running an optimization, you can look at the summary report to see what the optimizer did to remove congestion. The key metric to look at is the Total Capacity Added (Mb/s).
Figure 1 shows the design after optimization using the parameters specified in Step 1. In this case, the optimizer proposes to set up two new adjacencies: