Information Technology Reference
In-Depth Information
The router ID can also be seen in the output of the
show ip protocols
,
show ip ospf
, and
show ip ospf interfaces
commands:
R3#
show ip protocols
Routing Protocol is “ospf 1”
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 192.168.10.10
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
<output omitted>
R3#
show ip ospf
Routing Process “ospf 1” with ID 192.168.10.10
Supports only single TOS(TOS0) routes
Supports opaque LSA
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
<output omitted>
R3#
show ip ospf interface
FastEthernet0/0 is up, line protocol is up
Internet address is 172.16.1.33/29, Area 0
Process ID 1, Router ID 192.168.10.10, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 192.168.10.10, Interface address 172.16.1.33
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:00
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
<output omitted>
Use loopback addresses to change the router IDs of the routers in the topology.
Step 2.
R1(config)#
interface loopback 0
R1(config-if)#
ip address 10.1.1.1 255.255.255.255
R2(config)#
interface loopback 0
R2(config-if)#
ip address 10.2.2.2 255.255.255.255
R3(config)#
interface loopback 0
R3(config-if)#
ip address 10.3.3.3 255.255.255.255
Reload the routers to force the new router IDs to be used.
Step 3.
When a new router ID is configured, it will not be used until the OSPF process is restart-
ed. Make sure that the current configuration is saved to NRAM, and then use the
reload
command to restart each of the routers.
