The value of tmnxOamTrCtlSrcAddrType specifies the type of host
address to be used as the source for performing an OAM traceroute
operation. This object indicates the type of address stored in the
corresponding tmnxOamTrCtlSrcAddress object. Only 'ipv4' and 'ipv6'
address types are supported.
This object is valid only when the tmnxOamTrCtlTestMode has a
value of 'icmpTraceRoute' or 'lspTraceRoute'.