jcluser@vMX2# run show bridge statistics    
   Local interface: ge-0/0/5.0, Index: 343
     Broadcast packets:                   366
     Broadcast bytes  :                 21960
     Multicast packets:                     0
     Multicast bytes  :                     0
     Flooded packets  :                     0
     Flooded bytes    :                     0
     Unicast packets  :                    16
     Unicast bytes    :                  1340
     Current MAC count:                     1 (Limit 8192)
   Local interface: ge-0/0/4.0, Index: 342
     Broadcast packets:                     0
     Broadcast bytes  :                     0
     Multicast packets:                     0
     Multicast bytes  :                     0
     Flooded packets  :                     0
     Flooded bytes    :                     0
     Unicast packets  :                     0
     Unicast bytes    :                     0
     Current MAC count:                     0 (Limit 8192)
   Local interface: ge-0/0/3.0, Index: 336
     Broadcast packets:                     0
     Broadcast bytes  :                     0
     Multicast packets:                     0
     Multicast bytes  :                     0
     Flooded packets  :                     0
     Flooded bytes    :                     0
     Unicast packets  :                     0
     Unicast bytes    :                     0
     Current MAC count:                     0 (Limit 8192)
   Local interface: ge-0/0/2.0, Index: 334
     Broadcast packets:                     0
     Broadcast bytes  :                     0
     Multicast packets:                     0
     Multicast bytes  :                     0
     Flooded packets  :                     0
     Flooded bytes    :                     0
     Unicast packets  :                     0
     Unicast bytes    :                     0
     Current MAC count:                     0 (Limit 8192)
   Local interface: ge-0/0/1.0, Index: 332
     Broadcast packets:                     0
     Broadcast bytes  :                     0
     Multicast packets:                     0
     Multicast bytes  :                     0
     Flooded packets  :                     0
     Flooded bytes    :                     0
     Unicast packets  :                     0
     Unicast bytes    :                     0
     Current MAC count:                     0 (Limit 8192)
   Local interface: ge-0/0/0.0, Index: 340
     Broadcast packets:                     0
     Broadcast bytes  :                     0
     Multicast packets:                     0
     Multicast bytes  :                     0
     Flooded packets  :                     0
     Flooded bytes    :                     0
     Unicast packets  :                     0
     Unicast bytes    :                     0
     Current MAC count:                     0 (Limit 8192)

[edit]ma	

jcluser@vMX2# run show bridge mac-table extensive 

MAC address: 00:50:56:be:7f:9d
  Routing instance: default-switch
   Bridging domain: vlan-100, VLAN : 100
   Learning interface: ge-0/0/5.0   
   Base learning interface: ge-0/0/5.0   
   Layer 2 flags: in_hash,in_ifd,in_ifl,in_vlan,in_rtt,kernel,in_ifbd
   Epoch: 0                            Sequence number: 0     
   Learning mask: 0x00000001