Routers are receiving too many external routes and CPU spikes on low-memory devices. Which action mitigates the issue when redistributing routes?

The summary-address command is used on an Autonomous System Boundary Router (ASBR) to summarize external routes before injecting them into an OSPF area. This reduces the number of Type 5 LSAs, which are used for external routes, thereby decreasing the routing table size and CPU load on other routers, especially low-memory devices. The area range command is used on an Area Border Router (ABR) to summarize internal routes (Type 3 LSAs) between OSPF areas, not external routes. Therefore, configuring it on an ASBR or for external routes is incorrect. The summary-address command is specifically designed for summarizing external routes at the ASBR.