What is different between IPv6 routing table entries compared to IPv4 routing table entries?
- IPv6 routing tables include local route entries which IPv4 routing tables do not.
By design IPv6 is classless so all routes are effectively level 1 ultimate routes.*
- The selection of IPv6 routes is based on the shortest matching prefix, unlike IPv4 route selection which is based on the longest matching prefix.
- IPv6 does not use static routes to populate the routing table as used in IPv4.
Explanation: Routers running IOS release 15 have link local routing table entries for both IPv4 and IPv6. The selection of both IPv6 routes and IPv4 routes is based on the longest matching prefix. The routing tables of both IPv6 and IPv4 use directly connected interfaces, static routes, and dynamically learned routes.