Here is the show ip route command from router R1, which is load-balancing to the 10.80.13.0/30 network. On R1, the following change was made. In which two ways will the EIGRP routing table and topology table be affected? (Choose two.)

IT Exam Items Repository › Category: CCNP ENCOR v9 › Here is the show ip route command from router R1, which is load-balancing to the 10.80.13.0/30 network. On R1, the following change was made. In which two ways will the EIGRP routing table and topology table be affected? (Choose two.)

Here is the show ip route command from router R1, which is load-balancing to the 10.80.13.0/30 network.

R1> show ip route 
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 
       E1 - OSPF external type 1, E2 - OSPF external type 2 
       * - candidate default, U - per-user static route 
       o - ODR, P - periodic downloaded static route 
Gateway of last resort is not set
  10.80.0.0/8 is variably subnetted, 11 subnets, 4 masks
D    10.80.13.0/30 [90/2681856] via 10.80.234.3, 01:13:17, Serial0/0 
                   [90/2681856] via 10.80.234.2, 01:13:17, Serial1/0 
D    10.80.23.2/32 [90/2681856] via 10.80.234.2, 01:13:17, Serial0/0 
<output omitted>

On R1, the following change was made. In which two ways will the EIGRP routing table and topology table be affected? (Choose two.)

R1(config)# router eigrp 10
R1(config-router)# maximum-paths 1

There will be no change in the routing table for the route 10.80.13.0/30.
The EIGRP routing table will have only one route for 10.80.13.0/30.
The EIGRP topology table will have only one route for 10.80.13.0/30.
The EIGRP topology table will have no route for 10.80.13.0/30.
The EIGRP topology table will indicate both routes to the network 10.80.13.0/30.

Explanation: The configuration change on R1 involves the maximum-paths command, which dictates how many paths the EIGRP process installs in the router's IP routing table for a single destination.

Effect on the Routing Table: By default, Cisco IOS software allows EIGRP to install up to four equal-cost paths in the routing table. Configuring maximum-paths 1 explicitly disables load balancing. As a result, even though R1 has two valid, equal-cost paths to reach 10.80.13.0/30 (via 10.80.234.3 and 10.80.234.2), it will now only install one of those routes into the routing table.
Effect on the Topology Table: The EIGRP topology table functions as a database that contains all destination routes advertised by neighbor routers. Unlike the routing table, which only stores the "best" paths allowed by policy, the topology table retains information for every path learned from every adjacent neighbor. Limiting the number of paths installed in the routing table does not purge these entries from the protocol's underlying database. Therefore, the topology table will still show both routes to the network.

In conclusion, the maximum-paths command restricts the forwarding instructions (routing table) but does not limit the protocol's knowledge of the network structure (topology table).

Here is the show ip route command from router R1, which is load-balancing to the 10.80.13.0/30 network. On R1, the following change was made. In which two ways will the EIGRP routing table and topology table be affected? (Choose two.)

About The Author

ITExamAnswers Editorial Team