Based on Recommendation ITU-T G.9971, Recommendation ITU-T G.9973 specifies the configuration management protocol. This protocol is used to manage devices in the IP home network for the purpose of showing users the Layer 2 home network topology. Recommendation ITU-T G.9973 also enables fault management with utilizing device information which the local agent of the device manages. They are described in TTC JJ-300.00.