Information Technology Reference
In-Depth Information
When the router is reloaded, what is the router ID for R1?
10.1.1.1
When the router is reloaded, what is the router ID for R2?
10.2.2.2
When the router is reloaded, what is the router ID for R3?
10.3.3.3
Use the
show ip ospf neighbors
command to verify that the router IDs have changed.
Step 4.
R1#
show ip ospf neighbor
Neighbor ID
Pri
State
Dead Time
Address
Interface
10.3.3.3
0
FULL/ -
00:00:30
192.168.10.6
Serial0/0/1
10.2.2.2
0
FULL/ -
00:00:33
192.168.10.2
Serial0/0/0
R2#
show ip ospf neighbor
Neighbor ID
Pri
State
Dead Time
Address
Interface
10.3.3.3
0
FULL/ -
00:00:36
192.168.10.10
Serial0/0/1
10.1.1.1
0
FULL/ -
00:00:37
192.168.10.1
Serial0/0/0
R3#
show ip ospf neighbor
Neighbor ID
Pri
State
Dead Time
Address
Interface
10.2.2.2
0
FULL/ -
00:00:34
192.168.10.9
Serial0/0/1
10.1.1.1
0
FULL/ -
00:00:38
192.168.10.5
Serial0/0/0
Use the
router-id
command to change the router ID on the R1 router.
Step 5.
Note:
Some IOS versions do not support the
router-id
command. If this command is not available, continue to
Task 7.
R1(config)#
router ospf 1
R1(config-router)#
router-id 10.4.4.4
Reload or use “clear ip ospf process” command, for this to take effect
If this command is used on an OSPF router process that is already active (has neighbors),
the new router ID is used at the next reload or at a manual OSPF process restart. To manu-
ally restart the OSPF process, use the
clear ip ospf process
command:
R1(config-router)#
end
R1#
clear ip ospf process
Reset ALL OSPF processes? [no]:
yes
R1#
Use the
show ip ospf neighbor
command on router R2 to verify that the router ID of R1
has been changed.
Step 6.
R2#
show ip ospf neighbor
Neighbor ID
Pri
State
Dead Time
Address
Interface
10.3.3.3
0
FULL/ -
00:00:36
192.168.10.10
Serial0/0/1
10.4.4.4
0
FULL/ -
00:00:37
192.168.10.1
Serial0/0/0
