Hi Gerald,
What is the end goal?
Are you using the SX6036G to bridge between IB and Ethernet?
the SwitchX ethernet switch doesn't support MRP,MMRP.
To forward Multicast traffic between IB and Ethernet via the SX6036G, you should enable the proxy-arp multicast mode.
See the User Manual:
http://www.mellanox.com/related-docs/prod_management_software/MLNX-OS_VPI_v3_4_3002_UM.pdf section 8 - Gateway