The route daemon, routed, listens on UDP port 520. It receives broadcast messages from routers or other hosts using the Routing Information Protocol (RIP). These messages are used by your storage system to update its internal routing tables to determine which network interfaces are optimal for each destination.
Your storage system never broadcasts RIP messages containing routes because Data ONTAP is not capable of acting as a router.
RIP is not secure because an attacker can easily send artificial RIP messages and cause hosts running the routed daemon (such as your storage system) to redirect network traffic to the attacker. The attacker can then receive and sift this traffic for passwords and other information and send it on to the actual destination, where the intrusion is undetected. This method can also be used as a starting point for TCP session attacks.
Because of these security issues, use static routes (those set up using the route command on your storage system) instead of using the routed daemon.