Router_A#debug ip ospf events
OSPF events debugging is on
OSPF: Interface Serial0 going Down
OSPF: neighbor 192.168.1.1 is dead, state DOWN
OSPF: neighbor 192.168.3.1 is dead, state DOWN
OSPF: Tried to build Router LSA within MinLSInterval
OSPF: Interface Serial0 going Up
OSPF: 2 Way Communication to neighbor 192.168.3.1
OSPF: send DBD packet to 172.16.0.2 seq 0x381
OSPF: Receive dbd from 192.168.3.1 seq 0x8ED
OSPF: NBR Negotiation Done We are the SLAVE
OSPF: send DBD packet to 172.16.0.2 seq 0x8ED
OSPF: Receive dbd from 192.168.3.1 seq 0x8EE
OSPF: send DBD packet to 172.16.0.2 seq 0x8EE
OSPF: Database request to 192.168.3.1
OSPF: sent LS REQ packet to 172.16.0.2, length 12
OSPF: Receive dbd from 192.168.3.1 seq 0x8EF
OSPF: Exchange Done with neighbor 192.168.3.1
OSPF: send DBD packet to 172.16.0.2 seq 0x8EF
OSPF: Synchronized with neighbor 192.168.3.1, state:FULL