Recommendation ITU-T G.9905 specifies centralized metric based source routing (CMSR), a proactive, layer 2 multi-hop routing protocol. CMSR is a proactive routing protocol which can find and maintain reliable routes considering the link quality of both directions. The routing control packet overhead of CMSR is quite low compared to existing proactive routing protocols such as optimized link state routing (OLSR), so that it can be applied for large-scale networks even on narrow band power line communication (PLC) networks.

Amendment 1 adds the following features: a PAN-INFO sub-message in the Hello message to notify information on the coordinator or network status, message formats for non-6LoWPAN networks, and a procedure for inter-node communication and upstream source routing.