Value,Description,Reference
0,No Downward routes maintained by RPL,[RFC6550]
1,Non-Storing Mode of Operation,[RFC6550]
2,Storing Mode of Operation with no multicast support,[RFC6550]
3,Storing Mode of Operation with multicast support,[RFC6550]
4,P2P Route Discovery Mode of Operation,[RFC6997][RFC-ietf-roll-aodv-rpl-20]
5,Non-Storing Mode of Operation with ingress replication multicast support,[RFC9685]
6,Unassigned,
7,Reserved,[RFC9008][RFC9010][RFC9035][RFC-ietf-roll-dao-projection-40]