Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > OSPF > RIDs > Choosing the OSPF RID
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > OSPF > Initialization > Choosing the OSPF RID
Root: WRM Database > Information Technology > Certifications > CCNA > IOS > Initial Load > OSPF RID > Choosing the OSPF RID
Root: WRM Database > Information Technology > Certifications > CCNA > IOS Commands > "clear ip ospf process" > Choosing the OSPF RID
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > OSPF > IOS Commands > "clear ip ospf process" > Choosing the OSPF RID



Choosing the OSPF RID


Each router chooses its OSPF RID when OSPF is initialized. Initialization happens during the initial load of IOS. So, if OSPF comes up, and later other interfaces come up that happen to have higher IP addresses, the OSPF RID does not change until the OSPF process is restarted. OSPF can be restarted with the "clear ip ospf process" command, but depending on the circumstance IOS still may not change its OSPF RID until the next IOS reload.







References

Odom, Wendell (2008) CCNA ICND2 Official Exam Certification Guide, Second Edition. Indianapolis: Cisco Press.