A network engineer is testing OSPF routing and using loopback interfaces to represent future networks. The engineer enters the following commands on a router in OSPF Area 1:
RS29(config)# interface loopback 0 RS29(config-if)# ip address 10.5.54.1 255.255.255.0 RS29(config-if)# router ospf 1 RS29(config-router)# network 10.5.53.0 0.0.0.255 area 1
How will the route appear in each routing table of other area 1 routers?
- 10.5.54.0/32 is subnetted, 1 subnets
L 10.5.54.1 [110/65] via 10.1.1.1, 00:37:15, Serial 0/0/1 - 10.5.54.0/24 is subnetted, 1 subnets
O 10.5.54.1 [110/65] via 10.1.1.1, 00:37:15, Serial 0/0/1 - 10.5.54.0/32 is subnetted, 1 subnets
O 10.5.54.1 [110/65] via 10.1.1.1, 00:37:15, Serial 0/0/1 - 10.5.54.0/24 is subnetted, 1 subnets
O IA 10.5.54.1 [110/65] via 10.1.1.1, 00:37:15, Serial 0/0/1
Explanation: When a loopback interface is advertised through OSPF, it is always advertised with a /32 prefix length and shown in the routing table of other routers as an OSPF route with a /32 prefix. If the show ip ospf interface command is shown on the router with the loopback interface configured, the loopback interface shows as a loopback network type instead of a point-to-point, point-to-multipoint, broadcast, or nonbroadcast type.
Exam with this question: Quiz – OSPF CCNPv8 ENARSI
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