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https://apps.juniper.net/mib-explorer/search.jsp#object=dot1qPortVlanStatisticsTableifOutUcastPkts&product=Junos%20OS&release=17.2R1

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https://www.manageengine.com/products/mibbrowser-free-tool/

Q-BRIDGE-MIB refers only to internal VLAN indexes,

you need to use both MIBs to get Port/VLAN mappings including  the 802.1Q VLAN tag ID (jnxExVlanTag). 

1- define the Interface SNMP Index ( show interface ...)

2- snmp mib get + oid name or oid number + if ID ( from show interface ... ) 

{master:0}
readonly@EX4300-Client-1-Active> show snmp mib walk 1.3.6.1.2.1.17.1.4
dot1dBasePort.4096 = 4096
dot1dBasePort.4097 = 4097
dot1dBasePortIfIndex.4096 = 513
dot1dBasePortIfIndex.4097 = 514
dot1dBasePortCircuit.4096 = 0.0
dot1dBasePortCircuit.4097 = 0.0
dot1dBasePortDelayExceededDiscards.4096 = 0
dot1dBasePortDelayExceededDiscards.4097 = 0
dot1dBasePortMtuExceededDiscards.4096 = 0
dot1dBasePortMtuExceededDiscards.4097 = 0

show snmp mib get ifIndex.536
show snmp mib get ifDescr.536
show snmp mib get ifInOctets.536
show snmp mib get ifInUcastPkts.536
show snmp mib get ifOutOctets.536
show snmp mib get ifOutUcastPkts.536

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