OSPF for Routed Access: Starting from Cisco IOS Release 12.2(55)SE, the IP Base image supports a new feature called OSPF for Routed Access. OSPF for Routed Access is designed specifically to enable you to extend Layer 3 routing capabilities to the wiring closet. It supports only one OSPFv2 and one OSPFv3 instance, with a maximum number of 200 dynamically learned routes.
With the typical topology (hub and spoke) in a campus environment, where the wiring closets (spokes) are connected to the distribution switch (hub) forwarding all nonlocal traffic to the distribution layer, the wiring closet switch need not hold a complete routing table. A best practice design, where the distribution switch sends a default route to the wiring closet switch to reach interarea and external routes (OSPF stub or totally stub area configuration), should be followed when OSPF for Routed Access is used in the wiring closet. For more details, visithttp://www.cisco.com/en/US/partner/docs/solutions/Enterprise/Campus/routed-ex.html.
Note that the IP Base image entitles the user to configure OSPF for Routed Access; however, the restrictions on the number of routes and instances are not enforced in this release.
The IP Services image is required if one needs multiple OSPFv2 and OSPFv3 instances without route restrictions. Additionally, the IP Services image is required to enable the multi-VRF-CE feature.
その条件以上で OSPF を使用したい場合は、IP Service のライセンス購入/追加が必要になります。
補足: ちなみに、最新バージョンでは OSPF for Routed Access での学習ルート上限が 200->1000 に上がっているようです。