| Exam 200-120 | Question id=78 | IP Routing Technologies |
Which statements about the OSPF Router ID are true?
| A. |
It identifies the source of a Type 1 LSA. | |
| B. |
It should be the same on all routers in an OSPF routing instance. | |
| C. |
By default, the lowest IP address on the router becomes the OSPF Router ID. | |
| D. |
The router automatically chooses the IP address of a loopback as the OSPF Router ID. | |
| E. |
It is created using the MAC Address of the loopback interface. |
This router-id can be statically assigned, or it can be dynamically assigned based on an interface IP addresses.
To statically assign the router-id:
Router(config-router)#router-id 172.16.1.1
Automatically assign the router-id:
- The highest IP Address of a manually created loopback interface.
- If there is no configured Loopback interface then the router-id will be the highest IP Address of the active physical interface.