Chapter 5 NMT Execute Commands

Fail Analysis Command

Fail Analysis Command

Selecting Fail Analysis from the Execute menu allows you to create a situation where one or more lines fail. You can also generate a situation where the lines are failed one at a time (see the Simulate All menu choice). By failing a line, you can force the NMT to create alternative routes; the NMT does this by using the Automatic Routing Management algorithm.

Using this algorithm, the NMT can reveal whether network links have enough extra bandwidth, according to values in the configuration, to support extra traffic if one or several links go down. To conduct a fail analysis, you must first select Route or Optimize from the Execute menu.

The Fail Analysis submenu has the following choices:

•Fail: Fails one or more connections in the network. A location can be a node, card, or port. Failing a port will fail the link using that port.

Note In this case, the HELP key is useful guide. Enter HELP once to select the site. Enter Help a second time to select a port.

•Alternate Route—Attempts to reroute the connections after failing the network locations specified above. Its output results to the following tables in the Display menu: Total Links Load, Routes, and No Routes.

•Results—Displays reports that summarizes the alternative routes from the above reroute.

•Generate—Generate a file with the reports from above.

•Simulate All—Automatically fails each link, card, site, or port, and produces a report. When you select Simulate All, you are asked to enter a name for the report; the NMT fails each element one at a time, and you can display the report by selecting View from the Report menu.

•View—View any failure analysis report from a disk.

•Options—Allows you to specify whether the system should ignore IMATM trunks or virtual trunks when performing a fail analysis.

If all connections do not reroute as a result of link failure or a set of link failures, add additional capacity to the links by increasing the size of existing links, the link count, or adding new links. You can use TPI and WANDL to help design a resilient topology.

Build Sites Command

Selecting Build Sites from the Execute menu allows you to provision the sites without routing the connections. You have the option of building all sites or one specific site. If all links and connections are not provisioned, the command will display link and connection ends that could not be built.

 

Cisco WAN Modeling Tools Guide

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OL-10426-01, Rev. A0

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Cisco Systems OL-10426-01 manual Fail Analysis Command, Build Sites Command
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OL-10426-01 specifications

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