What is the usage of OSPF router-id and the selection principle of the router-id

Latest reply: Mar 24, 2016 13:45:35 950 1 0 0

What is the usage of OSPF router-id and the selection principle of the router-id?

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Osaideo Created Mar 24, 2016 13:45:35 Helpful(0) Helpful(0)

The router ID of each OSPF process is the unique identity on AS. It can be appointed by command, which has a highest priority. The configuration command is as following:
[Router]OSPF 100 router-id
If the router-id is not configured by command, the system will select an IP address of interfaces automatically. And the selection order will be: Firstly, select the largest IP address from all Loopback interfaces as the router-id, if there is no loopback interface, then the largest IP address of physic interfaces will be selected as the router-id.
To ensure the stability of router-id, once the router-id has been selected, it will not be changed even when a bigger IP address is configured, OSPF progress is deleted and re-configured, and OSPF progress is reset. Only when the IP address which has been selected as router-id is deleted or this interface is deleted, and OSPF progress is reset change the router-id.
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