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To disable injecting routes into an area from an ABR manually, the user can apply the prefix lists in inbound or outbound directions to control the dissemination of routes into and out of OSPF areas. The command used to control route dissemination is set protocols ospf area in filter-list prefix. The keyword in indicated routes advertised into an area. Whereas out indicates routes going out of the area. Its important to note that the user must configure the prefix list before applying it through the set protocols ospf area in filter-list prefix command. The command to create the prefix list is set protocols ospf area in|out filter-list prefix.
Figure 5-6. OSPF area range configuration.
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