Example-1: This configures a route summarization policy named OSPF_SUMM. The cost attribute is set to 100 and it will be set to the summary route. The cost is used for path selection. The inter_area attribute is set to true to use the area range for the summary configuration. If set to false it will use summary address. Once configured, the policy will be associated with an external EPG subnet marked with export route control in order to execute the actual summarization for the configured external EPG subnet.