Information Technology Reference
In-Depth Information
Configure the router to advertise the 192.168.10.8/30 network attached to the Serial 0/0/1
interface.
Step 4.
When you are finished, return to privileged EXEC mode:
R2(config-router)#
network 192.168.10.8 0.0.0.3 area 0
R2(config-router)#
end
%SYS-5-CONFIGI: Configured from console by console
R2#
Configure OSPF on the R3 router using the
router ospf
and
network
commands.
Step 5.
Use a process ID of 1. Configure the router to advertise the three directly connected net-
works. When you are finished, return to privileged EXEC mode:
R3(config)#
router ospf 1
R3(config-router)#
network 172.16.1.32 0.0.0.7 area 0
R3(config-router)#
network 192.168.10.4 0.0.0.3 area 0
R3(config-router)#
00:17:46: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.10.5 on Serial0/0/0 from
LOADING to FULL, Loading Done
R3(config-router)#
network 192.168.10.8 0.0.0.3 area 0
R3(config-router)#
00:18:01: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.10.9 on Serial0/0/1 from
EXCHANGE to FULL, Exchange Done
R3(config-router)#
end
%SYS-5-CONFIGI: Configured from console by console
R3#
Notice that when the networks for the serial links from R3 to R1 and R3 to R2 are added
to the OSPF configuration, the router sends a notification message to the console stating
that a neighbor relationship with another OSPF router has been established.
Task 6: Configure OSPF Router IDs
The OSPF router ID is used to uniquely identify the router in the OSPF routing domain. A router ID is
an IP address. Cisco routers derive the router ID in one of three ways and with the following precedence:
IP address configured with the OSPF
router-id
command
1.
Highest IP address of any of the router's loopback addresses
2.
Highest active IP address on any of the router's physical interfaces
3.
Examine the current router IDs in the topology.
Step 1.
Because no router IDs or loopback interfaces have been configured on the three routers,
the router ID for each router is determined by the highest IP address of any active interface.
What is the router ID for R1?
192.168.10.5
What is the router ID for R2?
192.168.10.9
What is the router ID for R3?
192.168.10.10
