The VLAN ID of the surveillance VLAN. The surveillance VLAN is used to assign VLANs for untagged video packets. The value zero is for display only and not configurable, which means there is no surveillance VLAN on the switch.
Sources for this description
D-Link official switch MIBsD-Link MIB copies (LibreNMS/Observium Community)Netdisco MIB archive copies