We have two X670 with MLAG and MPLS/VPLS enabled, some ports use MLAG. We have shared group of 4 ports for ISC link between switches, also have customer vlan V100 on both switches, vlan V100 does not added to any MLAG ports, only to ISC link as tagged and one non-MLAG port on each switch as tagged. On each switch have vpls pw to same destination(cisco). This PW-res using V100 as service vlan. One VPLS on one switch have status UP, another VPLS on another switch have status STANDBY because they both connected to the same Cisco ME3600X with "xconnect" and "backup peer" config.
In FDB we don't see any MACs on ISC link and traffic flooded to all ports belonging vlan V100 because switch don't have destination MAC in FDB. If we remove one of vpls pw-res MACs appear in FDB as Software Controlled Deletion on ISC link and all work correctly on switch where not have vpls pw. Disabling vpls is not help only deletion. Version IMG: 184.108.40.206.