MGMD Drop Unknown multicast traffic configuration. This feature can be enabled/disabled globally or per-VLAN for IGMP and MLD. If this field is set on-global, a single drop_unknown multicast filter is created to forward unknown multicast traffic for the Bridge. If this field is set as on-vlan, then one filter each will be created per-vlan to forward unknown multicast traffic on that VLAN. There could be cases where even if on-vlan is set, there are no more multicast filters available in the switch for a vlan and the vlan would fall back to a global filter. There could be cases where a global filter can't be supported in the given hardware platform. In those cases, though configuration is on-global, per-vlan filter would be created. There is a drop_unknown status in this same table which indicates the platform capability status. There is a drop_unknown status at VLAN level which indicates if for that VLAN, it falls back to global filter because of filter exhaustion. If the platform cannot support on-global and filters are exhausted then MGMD would flood the unknown multicast traffic on the VLAN.