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5-4-7-1. Port-based VLAN
In order for an end station to send packets to different VLANs, it has to be
either capable of tagging the packets it sends with VLAN tags OR be attached
to a VLAN-aware bridge. The VLAN-aware bridge must be capable of
classifying and tagging the packet with different VLAN ID. The classification
and tagging of the packets is based on default PVID and other information
about the packet, such as the protocol.
The MIL-SME801P switch will support protocol-based VLAN classification by
means of both built-in knowledge of layer 2 packet formats used by selected
popular protocols, such as Novell IPX and AppleTalk’s EtherTalk, and some
degree of programmable protocol matching capability.