Configure the router to limit the prefix size on any route advertisement to /24 or the least significant prefixes issued to the customer. Create a "match rule" within a "route profile" by specifying a prefix list, to be applied to the desired L3Out (external routed network) to filter BGP routes based on the prefixes defined in the list. The route profile is applied to a specific L3Out (external routed network) to control which prefixes are advertised or accepted from external networks. Refer to the L3 out documentation on setting up route maps or using the import controls on the external EPG subnets on this connection. Ensure on the L3Out the option for Route Control Enforcement Import is checked. Tenants >> {{your_Tenant}} >> Networking >> L3Out >> {{your_l3out}} >> Policy >> Main >> Route Control Enforcement