For easy management and effective control, RIP supports the features multi-process and multi-instance. The multi-process feature allows a set of interfaces to be associated with a specific RIP process. This ensures that the process performs all the protocol operations only on this set of interfaces. Therefore, multiple RIP processes can work on a single router and each process is responsible for a unique set of interfaces. In addition, the routing data is independent between RIP processes. However, routes can be imported between processes.
For routers that support VPN, you can associate each RIP process with a specific VPN instance. In this case, all the interfaces attached to the RIP process should be associated with the RIP-process-related VPN instance.