Consider the partial output of the show ip route eigrp command:

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Last Updated on July 31, 2021 by InfraExam

Consider the partial output of the show ip route eigrp command:

300-410 Part 05 Q16 067
300-410 Part 05 Q16 067

Which of the following destination subnets have equally load-balanced routes? (Choose all that apply.)

  • 172.161.4.47/30
  • 172.161.11.0/27
  • 15.200.16.0/24
  • 15.11.78.0/24
  • 0.0.0.0/0
Explanation:
The 172.161.11.0/27 and 15.200.16.0/24 networks have equally load-balanced routes. A default route, 0.0.0.0/0, has been configured for load balancing as well. These three subnets are each load balanced on multiple routes. The output entry for the 172.161.11.0/27 subnet is as follows:

D 172.161.11.0/27 [90/1723695] via 10.10.19.45, 00:56:17, S0/1
[90/1723695] via 10.10.19.40, 00:50:58, S0/1

This subnet can be reached by rtrA through two routes: 10.10.19.45 and 10.10.19.40 next-hop addresses. Both these routes have the same metric (1723695), and so are equally load balanced.

In the output, the 15.200.16.0/24 subnet has three equal-metric routes: 10.10.78.23, 10.10.19.40, and 10.10.70.41. These three routes are equally used to balance the load from rtrA to the 15.200.16.0/24 subnet.

The default route 0.0.0.0/0 is load balanced through two interfaces, as shown in the output:

D*EX 0.0.0.0/0 [170/2645987] via 10.10.70.41, 00:05:12, Ethernet0/0
[170/2645987] via 10.10.70.23, 00:05:12, Ethernet0/0

This load balancing of the default route could be tested by using traceroute to any IP address not represented in the routing table and verifying the path taken.

Subnets 172.161.4.47/30 and 15.11.78.0/24 are not participating in load balancing. In the given output, there is a single route (line) for both of these subnets. The rtrA router uses the route through the next-hop 10.10.78.23 to reach the 172.161.4.47/30 destination subnet. Similarly, rtrA uses the next-hop 10.10.70.41 to transmit packets to the 15.11.78.0/24 subnet.

Objective:
Layer 3 Technologies
Sub-Objective:
Configure and verify EIGRP load balancing

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