Routing Table

The routing table in a router using RIPng contains an entry for every known destination network.

Each routing table entry contains the following information:

• IP address and prefix length of the destination network
• Metric (hop count) to the destination network
• IP address of the next hop router, if the destination is not directly connected
• Interface for the next hop
• Timer that tracks the amount of time since the entry was last updated
• A flag that indicates if the entry is a new one since the last update
• The source of the route, for example, static, RIPng, OSPFv3, etc.

The router exchanges an update message with each neighbor every 30 seconds (default value), or when there is a change to the overall routed topology (also called triggered updates). If a router does not receive an update message from its neighbor within the route timeout period (180 seconds by default), the router assumes the connection between it and its neighbor is no longer available.