About OSPF
Open Shortest Path First (OSPF) is an Interior Gateway Protocol (IGP) developed by the OSPF working group of the Internet Engineering Task Force (IETF). Designed expressly for IP networks, OSPF supports IP subnetting and tagging of externally derived routing information. OSPF also allows packet authentication and uses IP multicast when sending and receiving packets.
Segment routing configuration on the OSPF protocol can be applied at the process or the area level. If you configure segment routing at the process level, it is enabled for all the areas. However, you can enable ore disable it per area level.
Segment routing on the OSPF protocol supports the following:
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OSPFv2 control plane
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Multi-area
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IPv4 prefix SIDs for host prefixes on loopback interfaces
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Adjacency SIDs for adjacencies