Examine EIGRP in the Routing Table

We can verify the EIGRP in the routing table using the “show ip route” command. It is important to verify the information in the routing table to ensure that it is populated as estimated, based on configurations entered. The automatic summarization is enabled by default before in the ISO 15. It is important to know that auto summarization can make a difference in the information displayed in the IPv4 routing table. If auto summarization is enabled by default then we can disable it using a “no auto-summary” command in router configuration mode.

Figure 1, illustrates the routing table of R1 for the topology we have used in the previous lesson. EIGRP routes are represented in the routing table with letter D because the protocol is based upon the DUAL algorithm.

Examine EIGRP in the Routing Table

The command verifies EIGRP in the routing table. It displays the entire routing table; including remote networks learned dynamically, directly connected and static routes. It is the first command used to check for convergence. If routing is correctly configured on all routers, the show ip route command displays a full routing table. Notice that R1 has installed routes to three IPv4 remote networks in its IPv4 routing table:

  • 168.1.0/24 network, received from router R2 via 10.10.10.6, on the Gigabit Ethernet 0/0 interface
  • 168.2.0/24 network, received from router R3 via 10.10.10.2 on the Gigabit Ethernet 0/1 interface
  • 10.10.8/30 network, received from both R2 on the Gigabit Ethernet 0/0 interface, and from R3 on the Gigabit Ethernet 0/1 interface

R1 has two different paths to the 10.10.10.8/30 network because its cost to reach that network is the same or equal using both routers. R1 uses both paths to accomplish this network, which is known as load balancing.