This is a yes/no switch on an SDP bind that turns on counting of ingress packets dropped for carrying an unexpected extra VLAN tag. An admin enables it, setting the value to true, only on the specific bindings where visibility into that drop reason is needed, since it defaults to false everywhere else to avoid unnecessary counting overhead. For example, setting sdpBindIngressExtraVlanTagDropCount to true on a suspect bind would start the paired packet and octet counters incrementing as double-tagged frames are rejected there.