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If a router is configured to introduce an address summary into an NLSP area, it does so, with the number of ticks equal to 1 (as the default), an area count equal to 6 (as the default), and the ability to configure both parameters with a different value. The area count is the number of areas through which the route information is allowed to propagate. As the route information is passed through each of these areas, the area count is decremented by one. This enables the initial sending router to control the spread of information through all NLSP areas that are connected to each other.
Address summaries are not exported from an NLSP area into a RIP cloud because the capability to express a summarized route within RIP does not exist. In addition, updating RIP with this capability is not cost-effective because the default route is sufficient for RIP.
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