OSPF master slave election

For every OSPF neighbor adjacency, one of the two routers is elected as a master, and the other is a slave. The master sends the first Database Description Packet (DDP) , and is the only part that is allowed to retransmit. The slave can only respond to the master's Database Description Packets. The master/slave relationship is negotiated in state ExStart.

The router with the higher router ID becomes master. This is not to be confused with the DR/BDR election process.

Links: https://datatracker.ietf.org/doc/html/rfc2328#page-100

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