In the flat layer approach, each domain in the network knows the every other domain information in the network through the domain mapping table. Domain mapping table needs to be updated, either a new member joins the network or existing one leaves the network. If new node (RADIUS server) joins the network then domain mapping table present on all other nodes in the network needs to be updated with new node domain information. One of the nodes in the network is responsible to broadcast the information of join/leave node operation to all other nodes in the network to update their domain mapping table with latest membership updates. With this simple broadcasting approach in the network, update operation may take much time to update all domain mapping tables in the network.