Thursday, March 16, 2006

 

Gateway of Last Resort With EIGRP. (Question #41)

Consider the following two outputs from show ip route on a router that is learning about gateway of last resort information from a neighboring EIGRP router. In both cases the gateway of last resort is 30.30.30.2 but the details are different.

Can you deduce what had to be configured on the neighboring router to get the show ip route output in case#1 and how it was different from what needed to be configured on the neighboring router to get the show ip route output shown in case#2?

Case 1

Gateway of last resort is 30.30.30.2 to network 1.0.0.0

1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
D 1.1.1.1/32 [90/435200] via 30.30.30.2, 03:37:24, Ethernet0
D*EX 1.0.0.0/8 [170/307200] via 30.30.30.2, 00:00:16, Ethernet0
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/409600] via 30.30.30.2, 03:37:24, Ethernet0
33.0.0.0/32 is subnetted, 1 subnets
C 33.33.33.33 is directly connected, Loopback1
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
D 10.10.10.0 [90/307200] via 30.30.30.2, 03:37:24, Ethernet0
30.0.0.0/24 is subnetted, 1 subnets
C 30.30.30.0 is directly connected, Ethernet0


Case 2

Gateway of last resort is 30.30.30.2 to network 0.0.0.0

1.0.0.0/32 is subnetted, 1 subnets
D 1.1.1.1 [90/435200] via 30.30.30.2, 03:40:15, Ethernet0
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/409600] via 30.30.30.2, 03:40:15, Ethernet0
33.0.0.0/32 is subnetted, 1 subnets
C 33.33.33.33 is directly connected, Loopback1
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
D 10.10.10.0 [90/307200] via 30.30.30.2, 03:40:15, Ethernet0
30.0.0.0/24 is subnetted, 1 subnets
C 30.30.30.0 is directly connected, Ethernet0
D*EX 0.0.0.0/0 [170/307200] via 30.30.30.2, 00:00:07, Ethernet0


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