<P> Protocol - dependent modules (PDMs) are used by the routing protocol EIGRP to make decisions about adding routes learned from other sources; for example other routers or routing protocols to the routing table . In fact EIGRP has the capability for routing several different protocols including IPv4 and IPv6 using protocol - dependent modules (PDMs). The PDM is also capable of carrying information from the routing table to the topology table . EIGRP offers support for various routed protocols (e.g. Internet Protocol Version 6 (IPv6), IP, IPX, AppleTalk), and has added support for Service Routing (SAF) PDMs . The only other routing protocol that comes with support for multiple network layer protocols is Intermediate System - to - Intermediate System (IS - IS). </P> <P> "In theory, EIGRP can add PDMs to easily adapt to new or revised routed protocols such as IPv6 . Each PDM is responsible for all functions related to its specific routed protocol . The IP - EIGRP module is responsible for the following functions: </P> <Ol> <Li> Send and receive EIGRP packets that bear IP data . </Li> <Li> Notify DUAL (Diffusing Update Algorithm) of new IP routing information that is received . </Li> <Li> Maintain the results of DUAL routing decisions in the IP routing table . </Li> <Li> Redistribute routing information that was learned by other IP - capable routing protocols. "When a newly discovered neighbor is learned, the address and interface of the neighbor are recorded, and this information is held in the neighbor table, stored in RAM . There is one neighbor table per each protocol - dependent module . </Li> </Ol>

What is the purpose of the eigrp pdm