When configure ldp resolve-root-using is set to mcast-rtm and then changed to ucast-rtm there is traffic disruption. If MoFRR is enabled, by toggling from mcast-rtm to ucast-rtm (or the other way around) the MoFRR is not used. In fact, MoFRR is torn down and re-established using the new routing table.
The mcast-rtm only has a local effect. All MLDP routing calculations on this specific node use MRTM and not RTM.
If mcast-rtm is enabled, all MLDP functionality is based on MRTM. This includes MoFRR, ASBR-MoFRR, policy-based SPMSI, and non-segmented inter-AS.