This route policy enables you to selectively exclude some VPC/VNet CIDRs from being advertised to on-prem.

One use case is if you have Spoke VPC/VNets that have multiple CIDR blocks, among which some of them are overlapping. If you attach these Spoke VPC/VNets, the Aviatrix Controller will reject them as there are overlapping CIDRs. By excluding the overlapping CIDRs, you will be able to attach the Spoke VPC/VNets.

When this policy is applied to an Aviatrix Transit Gateway, the list is an "Exclude list" meaning the CIDRs in the input fields will be excluded from advertising to on-prem.

When this policy is applied to an Aviatrix Spoke gateway, the list is an "Include list" meaning only the CIDRs in the input fields are advertised to on-prem. In Release 4.7 and later, the "Include list" can be network ranges that are outside of the Spoke VPC/VNet CIDR.