Packet format changes OSPF version number changed to 3 From the LSA header, the options field has been removed. In hello packets and database description, the options field is changed from 16 to 24 bits. In hello packet, the address information has been removed. The interface ID has been added. In router-LSAs, two options bits, the R-bit and the V6-bit, have been added. R-bit: allows for multi-homed hosts to participate in the routing protocol. V6-bit: specializes the R-bit. Add instance ID, which allows multiple OSPF protocol instances on the same logical interface.
PaCkEt fOrmat ChAnges oSpF vErsion nUmbEr changeD To 3 from tHe LsA headEr, the oPtioNS fIelD has Been removed. in hello pAcKETS And databasE dEscRiption, the oPtiOns fIElD iS cHanGeD From 16 to 24 bIts. IN hEllo PAckeT, ThE address InFoRmatioN haS bEeN RemoVed. the interface id haS beeN added. in rOuTer-lsaS, tWo oPtIons bIts, tHE r-bIT anD ThE v6-Bit, haVE beeN adDeD. r-BiT: AlLOws for mUlti-hoMed hosts to PaRtiCIpAte in THe routinG protocoL. V6-bit: specIaLIzes ThE R-BiT. add inSTANCe iD, whiCh aLloWs MultIple osPf PRotOCol instances on The SAme logicAL iNtErFace.