Multicast counter via SNMP

Can’t read multicast counter via SNMP on RB750Gr3, RB2011

From terminal :

[admin@STRZ] > interface ethernet print stats-detail  

Flags: X - disabled, R - running, S - slave 
 0 R  ;;; SYG
      name="ether1" driver-rx-byte=4 644 733 013 238 driver-rx-packet=3 449 595 665 driver-tx-byte=8 823 050 447 driver-tx-packet=122 782 745 rx-bytes=4 658 531 400 447 
      rx-packet=294 309 197 rx-too-short=0 rx-64=23 687 667 rx-65-127=58 538 776 rx-128-255=2 557 261 rx-256-511=1 379 234 rx-512-1023=2 200 872 rx-1024-1518=3 361 231 861 rx-too-long=0 
      rx-broadcast=52 850 469 rx-pause=0 rx-multicast=3 102 436 004 rx-fcs-error=0 rx-align-error=0 rx-fragment=0 rx-jabber=0 rx-drop=0 tx-bytes=9 331 260 541 tx-packet=116 039 331 
      tx-64=5 549 629 tx-65-127=115 665 844 tx-128-255=1 400 258 tx-256-511=109 994 tx-512-1023=29 282 tx-1024-1518=27 739 tx-broadcast=331 803 tx-pause=0 tx-multicast=6 411 611 
      tx-collision=0 tx-excessive-collision=0 tx-multiple-collision=0 tx-single-collision=0 tx-deferred=0 tx-late-collision=0 tx-drop=0 tx-fcs-error=0

is OK.

From SNMP :

IF-MIB::ifInMulticastPkts.1 = Counter32: 0
IF-MIB::ifOutMulticastPkts.1 = Counter32: 0

IF-MIB::ifHCInMulticastPkts.1 = Counter64: 0
IF-MIB::ifHCOutMulticastPkts.1 = Counter64: 0

How to read the rx-multicast and tx-multicast value via SNMP ?