When using the show ip route command, what code indicates OSPF routes not within the local area?

The code that indicates OSPF routes not within the local area is represented as "IA." This stands for Inter-Area routes, which are routes learned from another area within the OSPF routing domain. OSPF, or Open Shortest Path First, is a link-state routing protocol that organizes networks into areas to optimize routing.

When OSPF processes routes, it distinguishes between intra-area routes (routes within the same OSPF area) and inter-area routes. The "IA" code is specifically used to mark those routes that have been learned from a different area than the one in which the router resides. This distinction is crucial as it helps network administrators understand how routing decisions are made and helps in troubleshooting routing issues.

In contrast, "O" indicates intra-area routes, which are learned from the same OSPF area, while "O E2" signifies external E2 routes learned from another autonomous system. "R" represents routes learned from the RIP (Routing Information Protocol). Each of these codes serves a different purpose in the context of OSPF and routing, highlighting the importance of understanding the nature of each route type in network management.