Module Summary
 EIGRP starts by building a table of adjacent neighbors. Route
exchanges with these neighbors result in an EIGRP topology
table. The DUAL process calculates the best EIGRP routes,
which are moved into the IP routing table.
 Steps to configure basic EIGRP are: define EIGRP as a routing
protocol, define attached networks participating in EIGRP, and, if
desired, define interface bandwidth.
 The configuration of a passive interface, IP default-network, and
summarization are all advanced steps to improve network
scalability and decrease the number of EIGRP updates
exchanged between EIGRP neighbors.
© 2009 Cisco Systems, Inc. All rights reserved.
ROUTE v1.0—2-1
Module Summary (Cont.)
 Any Transport over MPLS (AToM) supports EIGRP, allowing
service provider PE-routers to be aware of EIGRP and P-routers
to be hidden from the customer network.
 EIGRP supports MD5 authentication, which checks and
authenticates the source of each routing update packet received.
 Features such as stub routing and active process enhancement
help improve network stability and performance.
© 2009 Cisco Systems, Inc. All rights reserved.
ROUTE v1.0—2-2
© 2009 Cisco Systems, Inc. All rights reserved.
ROUTE v1.0—2-3