I have an issue with heartbeat on MPX. Same conf works for my SDX/VPX. I use -tagall and bind the tag on a dedicated interface + switch allowing this VLAN. When I do a capture, nothing is sent through this interface/VLAN on MPX. The only difference is the VPX uses VLAN ID 1 for mgt as it go through SDX. MPX uses a native ID X for the mgt, not default 1, access port. Maybe it's related but the MPX send heartbeat only through the Mgt. Thanks!