D-Link DES-3225G Switch User Manual


 
24-port NWay Ethernet Switch User’s Guide
48 Switch Management Concepts
In the above example, step 4 is the key element. Because
the packet has 802.1Q VLAN data encoded in it ’s header,
the ingress port can make VLAN-based decisions about its
delivery – whether server #2 is attached to a port that is a
member of VLAN 2 and thus should the packet be delivered,
the queuing priority to give to the packet, etc. It can also
perform these functions for VLAN 1 packets as well, and in
fact, for any tagged packet it receives regardless of the
VLAN number.
If the ingress port in step 4 were connected to a non-
802.1Q-compliant device and was thus receiving untagged