Dynamic Routing

Invalid routes are automatically removed

Route fails

If a route fails, a backup route is found if available

Key points

• Routers can use dynamic routing protocols to advertise information about the routes they know to other routers.

• They form adjacencies / neighbor relationships / neighborships with adjacent routers to exchange this information.

• If multiple routes to a destination are learned, the router determines which route is superior and adds it to the routing table. It uses the 'metric' of the route to decide which is superior (lower metric = superior).