Aggregated routes are introduced into NLSP in the same way that external RIP routes are introduced. There are two methods of introducing aggregated routes into NLSP:
For example, if a router is configured with address summaries 572* and 5729* on a link running RIP and learns from that link that the destination 57285489 is reachable and that no other matching destinations are learned, then the router reports the aggregated route 572* to the NLSP area. The asterisk represents a wildcard character. If the router learns that destination 57298381 is reachable, then only 5729* is reported to the NLSP area. If both 57298381 and 57212376 are reachable, then the router reports both 572* and 5729* to the NLSP area.
Routers always report aggregated routes with the longest match. For example, if a router is configured with address summaries C9* and C91* and learns that the destination C9123456 is reachable, then the router reports only the aggregated route C91*.