Static Routing and Distance Vector Routing Protocols - CCIE Routing and Switching Exam Certification Guide - page 353

The output for Router10 is shown in Example 7-32. The feasible distance (281600) shown for
network 172.16.2.0/24 is the same number shown as the neighbor's metric in Router9's
topology table.

Example 7-32 EIGRP Topology Table of Router10

Router10#show ip eigrp topology
IP-EIGRP Topology Table for AS(100)/ID(172.16.4.2)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status

P 172.16.4.0/30, 1 successors, FD is 2169856
via Connected, Serial0
P 172.16.1.0/24, 1 successors, FD is 2195456
via 172.16.4.1 (2195456/281600), Serial0
P 172.16.2.0/24, 1 successors, FD is 281600
via Connected, Ethernet0
P 172.16.3.0/28, 1 successors, FD is 2211584
via 172.16.4.1 (2211584/297728), Serial0

EIGRP Summary
The characteristics of EIGRP are summarized as follows:
•

Hybrid routing protocol (distance vector that has link-state protocol characteristics).

•

Uses IP protocol 88.

•

Classless protocol (supports VLSMs).

•

Default composite metric of bandwidth and delay.

•

Load and reliability can be factored into the metric.

•

Sends partial route updates only when changes occur.

•

Support for authentication.

•

Uses DUAL for loop prevention.

•

By default, equal-cost load balancing; unequal-cost load balancing with the variance
command.

•

Administrative distance is 90 for EIGRP internal routes, 170 for EIGRP external routes,
and 5 for EIGRP summary routes.