I had 11.3.0 some issue of sysVlanStatTable or sysVlanxStatTable.
snmpwalk -m F5-BIGIP-SYSTEM-MIB -c public -v 2c f5_host .1.3.6.1.4.1.3375.2.1.2.13.2.2.1
F5-BIGIP-SYSTEM-MIB::sysVlanMemberVmname."/Common/HA"."1.3" = STRING: 1.3
F5-BIGIP-SYSTEM-MIB::sysVlanMemberVmname."/Common/LAN"."1.4" = STRING: 1.4
F5-BIGIP-SYSTEM-MIB::sysVlanMemberVmname."/Common/WAN"."1.1" = STRING: 1.1
F5-BIGIP-SYSTEM-MIB::sysVlanMemberVmname."/Common/WAN2"."1.2" = STRING: 1.2
F5-BIGIP-SYSTEM-MIB::sysVlanMemberVmname."/Common/WAN3"."1.2" = STRING: 1.2
F5-BIGIP-SYSTEM-MIB::sysVlanMemberParentVname."/Common/HA"."1.3" = STRING: /Common/HA
F5-BIGIP-SYSTEM-MIB::sysVlanMemberParentVname."/Common/LAN"."1.4" = STRING: /Common/LAN
F5-BIGIP-SYSTEM-MIB::sysVlanMemberParentVname."/Common/WAN"."1.1" = STRING: /Common/WAN
F5-BIGIP-SYSTEM-MIB::sysVlanMemberParentVname."/Common/WAN2"."1.2" = STRING: /Common/WAN2
F5-BIGIP-SYSTEM-MIB::sysVlanMemberParentVname."/Common/WAN3"."1.2" = STRING: /Common/WAN3
F5-BIGIP-SYSTEM-MIB::sysVlanMemberTagged."/Common/HA"."1.3" = INTEGER: false(0)
F5-BIGIP-SYSTEM-MIB::sysVlanMemberTagged."/Common/LAN"."1.4" = INTEGER: false(0)
F5-BIGIP-SYSTEM-MIB::sysVlanMemberTagged."/Common/WAN"."1.1" = INTEGER: false(0)
F5-BIGIP-SYSTEM-MIB::sysVlanMemberTagged."/Common/WAN2"."1.2" = INTEGER: true(1)
F5-BIGIP-SYSTEM-MIB::sysVlanMemberTagged."/Common/WAN3"."1.2" = INTEGER: true(1)
F5-BIGIP-SYSTEM-MIB::sysVlanMemberType."/Common/HA"."1.3" = INTEGER: interface(0)
F5-BIGIP-SYSTEM-MIB::sysVlanMemberType."/Common/LAN"."1.4" = INTEGER: interface(0)
F5-BIGIP-SYSTEM-MIB::sysVlanMemberType."/Common/WAN"."1.1" = INTEGER: interface(0)
F5-BIGIP-SYSTEM-MIB::sysVlanMemberType."/Common/WAN2"."1.2" = INTEGER: interface(0)
F5-BIGIP-SYSTEM-MIB::sysVlanMemberType."/Common/WAN3"."1.2" = INTEGER: interface(0)
snmpwalk -m F5-BIGIP-SYSTEM-MIB -c public -v 2c f5_host .1.3.6.1.4.1.3375.2.1.2.13.6.2.1.3
F5-BIGIP-SYSTEM-MIB::sysVlanStatBytesIn."/Common/HA" = Counter64: 14227914980
F5-BIGIP-SYSTEM-MIB::sysVlanStatBytesIn."/Common/LAN" = Counter64: 1083712031397
F5-BIGIP-SYSTEM-MIB::sysVlanStatBytesIn."/Common/WAN" = Counter64: 300664146409
F5-BIGIP-SYSTEM-MIB::sysVlanStatBytesIn."/Common/WAN2" = Counter64: 142056782281
F5-BIGIP-SYSTEM-MIB::sysVlanStatBytesIn."/Common/WAN3" = Counter64: 142056782281
snmpwalk -m F5-BIGIP-SYSTEM-MIB -c public -v 2c f5_host .1.3.6.1.4.1.3375.2.1.2.13.7.2.1.6
F5-BIGIP-SYSTEM-MIB::sysVlanxStatHcInOctets."/Common/HA" = Counter64: 14227919270
F5-BIGIP-SYSTEM-MIB::sysVlanxStatHcInOctets."/Common/LAN" = Counter64: 1083712916719
F5-BIGIP-SYSTEM-MIB::sysVlanxStatHcInOctets."/Common/WAN" = Counter64: 300664161169
F5-BIGIP-SYSTEM-MIB::sysVlanxStatHcInOctets."/Common/WAN2" = Counter64: 142056798677
F5-BIGIP-SYSTEM-MIB::sysVlanxStatHcInOctets."/Common/WAN3" = Counter64: 142056798677
Can see WAN2 and WAN3 at the 1.2, but they have the same statistical value.