The IP Base image supports Open Shortest Path First (OSPF) for Routed Access, Enhanced Interior
Gateway Routing Protocol (EIGRP) "limited" Stub Routing, Nonstop Forwarding/Stateful Switchover
(NSF/SSO), and RIPv1/v2. The IP Base image does not support enhanced routing features such as BGP,
Intermediate System-to-Intermediate System (IS-IS), Full OSPF, Full Enhanced Interior Gateway
Routing Protocol (EIGRP) & Virtual Routing Forwarding (VRF-lite).

The LAN Base image complements the existing IP Base and Enterprise Services images. It is focused
on customer access and Layer 2 requirements and therefore many of the IP Base features are not
required. The IP upgrade image is available if at a later date you require some of those features

Starting with Cisco IOS Release XE 3.5.0E, OSPF Routed Access in IP Base support rose to 1000 routes.

Cisco XE Release Strategy

Customers with Catalyst 4500 Series Switches who need the latest hardware and software features
should migrate to Cisco IOS Release XE 3.6.0E.

IOS XE 3.2.xSG is an active maintenance train that supports Sup7E only. IOS XE 3.4.xSG is a
maintenance train supporting Sup7E and Sup7L-E. IOS XE 3.6.xSG is a maintenance train supporting
Sup7E, Sup7L-E and Sup8-E. IOS XE 3.6.xE, 3.4.xSG, and 3.2.xSG are extended maintenance (EM)
releases. IOS XE 3.5.xE and 3.3.0SG are standard releases (SM).

Figure 1

displays the release strategy.