Optimize Command, Message | Cisco Systems OL-10426-01 specs

Chapter 5 NMT Execute Commands

Optimize Command

The NMT provides several tools for optimizing network models that allow you to create a least-cost topology with selected links. When you select Optimize from the Execute menu, the NMT processes your configuration to design a least-facilities-cost network. The Optimize command eliminates unused links (links that are not used for routing traffic) from the topology. Although the unused links are eliminated from the topology, they remain in the links table for possible later use. The process works as follows:

1.The system calculates all possible topologies and selects the one in which all traffic is routed at the lowest possible cost. During this process, the Optimizing Topology message box displays a running tally of the number of topologies tried, the last two most recent costs, and the least cost so far If a connection fails, the router breaks the routing loop.

Initial Topology is the starting point for building all other topologies that the optimizer can generate and analyze. It is generated from your specified data, including all sites, links that have positive values in the ‘Keep’ field and links specified in the preferred routes for the connections.

2.The connections are routed and the complete path is verified. During this process the Routing Connections message box displays the total number of network connections and maintains a running tally of the number of connections successfully routed.

3.The program generates several reports. These include informatory messages which describe the algorithm used to generate the resulting topology (initial, connection based, minimum span tree, or Link table).

Note If the optimizer fails to find a topology based on initial topology and the minimum span tree algorithm, it will build a topology based on the Link table. All links marked as removable will be removed by the optimizer; otherwise, they will be used for connections.

You can stop the optimize process by pressing Escape. If you press Escape during the first step when the system is calculating all the possible topologies, you are given the option to cancel all processes or continue with the second process using the best topology found so far.

If the NMT approach to optimization is insufficient, consider using the TPI to translate your network into WANDL format. WANDL offers several different optimization methods. (See Chapter 12, “Third-Party Interface.”)

Optimize will write up an informatory message describing which algorithm it used to obtain optimal topology.

Table 5-3 Optimize Informatory Messages

Message	Meaning

Initial Topology	Existing Facilities were sufficient to route all
	connections. No new links were added.

Connection Based	Actual/preferred route information was used to
	obtain starting topology.

Minimum Span Tree	Minimum span tree algorithm was used to
	generate an initial tree topology.

Link Based	Links were sorted.

	Cisco WAN Modeling Tools Guide
	Cisco WAN Modeling Tools Guide
OL-10426-01, Rev. A0		5-5
OL-10426-01, Rev. A0		5-5

OL-10426-01 specifications

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Cisco Systems OL-10426-01 manual Optimize Command, Optimize Informatory Messages

Models: OL-10426-01