Chapter 25 Understanding FWSM 4.x Routing and Feature Enhancements
Several significant additions to the 4.x code enhance routing and other features. Some of these additions include Enhanced Interior Gateway Routing Protocol (EIGRP) routing, route health injection, and some additional security features and application inspection enhancements.
EIGRP has been a long-awaited feature for the Firewall Services Module (FWSM). With EIGRP support, the FWSM can be integrated into an existing EIGRP network, minimizing the need to redistribute routing information into other routing protocols. This reduces the complexity of managing multiple routing processes and simplifies the network design, especially within the datacenter.