What is the recommended Cisco best practice for configuring an OSPF-enabled router so that each router can be easily identified when troubleshooting routing issues?
- Configure a value using the router-id command.
- Use the highest active interface IP address that is configured on the router.
- Use a loopback interface configured with the highest IP address on the router.
- Use the highest IP address assigned to an active interface participating in the routing process.
Explanation: A Cisco router is assigned a router ID to uniquely identify it. It can be automatically assigned and take the value of the highest configured IP address on any interface, the value of a specifically-configured loopback address, or the value assigned (which is in the exact form of an IP address) using the router-id command. Cisco recommends using the router-id command.