ethIfDefaultVLAN 1.3.6.1.4.1.2928.2.2.1.3.2.1.13

If an untagged frame is received on this interface, it will be tagged with a VLAN having a VLAN id as specified in this variable. The VLAN tag will be a customer or service tag as set on ethFwdVLANMode, or ignored if set to `transparent(1)'.