|Understanding OSPF Router ID (RID) Assignment|
In both OSPFv2 (IPv4) and OSPFv3 (IPv6), the router ID (RID) is a 32-bit number assigned to the router. The RID must be unique within the OSPF network, as a RID provides a point of origin for link state advertisements (LSAs). If LSAs from more than one device improperly sharing a RID appear in the OSPF database, the shortest path first (SPF) calculation for the OSPF area will be, at best, wonky.
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|Working With OSPF Router IDs (RIDs)|
Explore how OSPF router IDs are assigned, how to change them, and the impact to the OSPF domain when router IDs are changed in this real-time demo using OSPFv3 between two Cisco IOS devices.