I have encountered a problem getting the FDB table from a CRS106-1C-5S (RouterOS v7., it just returns port number 0 for most MAC addresses.
For example (I left only the relevant lines in the output):
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/interface/bridge/host/print
Flags: D - DYNAMIC; L - LOCAL; E - EXTERNAL
Columns: MAC-ADDRESS, ON-INTERFACE, BRIDGE
# MAC-ADDRESS ON-INTERFACE BRIDGE
80 D E 1C:61:B4:5A:1D:DE sfp5 bridge
95 DL 48:A9:8A:87:7E:B8 sfp4 bridge
96 DL 48:A9:8A:87:7E:B9 sfp5 bridge
104 D E 60:E3:27:DA:3A:1F sfp4 bridge
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/interface/ethernet/switch/unicast-fdb/print
Flags: D - DYNAMIC; A - ACTIVE
Columns: MAC-ADDRESS, PORT, VLAN-ID, ACTION, MIRROR, SVL, AGE, ISOLATION-PROFILE, QOS-GROUP
# MAC-ADDRESS PORT VLAN-ID ACTION MIRROR SVL AGE ISOLATION-PROFILE QOS-GROUP
8 DA 60:E3:27:DA:3A:1F sfp4 12 forward no no 2 promiscuous none
26 DA 48:A9:8A:87:7E:B8 switch1-cpu 0 forward no yes 3 promiscuous none
53 DA 48:A9:8A:87:7E:B9 switch1-cpu 0 forward no yes 3 promiscuous none
54 DA 1C:61:B4:5A:1D:DE sfp5 12 forward no no 2 promiscuous none
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snmpwalk -v2c -cpublic 1.2.3.4 .1.3.6.1.2.1.17.4.3.1.1
SNMPv2-SMI::mib-2.17.4.3.1.1.28.97.180.90.29.222 = Hex-STRING: 1C 61 B4 5A 1D DE
SNMPv2-SMI::mib-2.17.4.3.1.1.72.169.138.135.126.184 = Hex-STRING: 48 A9 8A 87 7E B8
SNMPv2-SMI::mib-2.17.4.3.1.1.72.169.138.135.126.185 = Hex-STRING: 48 A9 8A 87 7E B9
SNMPv2-SMI::mib-2.17.4.3.1.1.96.227.39.218.58.31 = Hex-STRING: 60 E3 27 DA 3A 1F
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snmpwalk -v2c -cpublic 1.2.3.4 .1.3.6.1.2.1.17.4.3.1.2.28.97.180.90.29.222
SNMPv2-SMI::mib-2.17.4.3.1.2.28.97.180.90.29.222 = INTEGER: 0
snmpwalk -v2c -cpublic 1.2.3.4 .1.3.6.1.2.1.17.4.3.1.2.72.169.138.135.126.184
SNMPv2-SMI::mib-2.17.4.3.1.2.72.169.138.135.126.184 = INTEGER: 5
snmpwalk -v2c -cpublic 1.2.3.4 .1.3.6.1.2.1.17.4.3.1.2.72.169.138.135.126.185
SNMPv2-SMI::mib-2.17.4.3.1.2.72.169.138.135.126.185 = INTEGER: 6
snmpwalk -v2c -cpublic 1.2.3.4 .1.3.6.1.2.1.17.4.3.1.2.96.227.39.218.58.31
SNMPv2-SMI::mib-2.17.4.3.1.2.96.227.39.218.58.31 = INTEGER: 0
There is no such problem with, say, CRS328-4C-20S-4S+RM. However, on that switch VLANs are configured diferently (/interface/bridge/vlan instead of /interface/ethernet/switch).