Huaimo Chen, Gyan Mishra, Aijun Wang, Yisong Liu, Haibo Wang, Yanhe Fan, 2022-05-15, This doc describes extensions to Border Gateway Protocol (BGP) for flooding the backlink states on a topology that is a subgraph of the total topology of a BGP-SPF area, so that the amount of money of flooding traffic in the area is tremendously lessened.