Digitus RedRapid X User Manual page 58

Most small home or office networks do not need to use RIP; they have only one
router, such as the ADSL Router, and one path to an ISP. In these cases, there
is no need to share routes, because all Internet data from the network is sent to
the same ISP gateway.
You may want to configure RIP if any of the following circumstances apply to
your network:
Your home network setup includes an additional router or RIP-enabled PC

(other than the ADSL Router). The ADSL Router and the router will need to
communicate via RIP to share their routing tables.
Your network connects via the ADSL line to a remote network, such as a

corporate network. In order for your LAN to learn the routes used within your
corporate network, they should both be configured with RIP.
Your ISP requests that you run RIP for communication with devices on their

network.
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