nbsCmmcSysTftpHostIP 1.3.6.1.4.1.629.200.4.1

This is the IP Address of the TFTP Server/Client serving the actual TFTP transfer. A TFTP transfer may mean a software/microcode/parameter/etc.. download/upload process, initiated by the SNMP agent, for one of the modules, including, but not only, the System Control Card. It is 0.0.0.0, if th TFTP host is undefined.