1-14
Static Virtual LANs (VLANs)
VLAN Operating Rules
Figure 1-7. Untagged VLAN Operation
■ Tagged Packet Forwarding: If a port is a tagged member of the same
VLAN as an inbound, tagged packet received on that port, then the switch
forwards the packet to an outbound port on that VLAN. (To enable the
forwarding of tagged packets, any VLAN to which the port belongs as a
Yes
Port “X” receives
an inbound,
untagged Packet.
Is the
port an untagged
member of any
VLANs?
No
Does the
packet’s protocol
match the protocol of
an untagged VLAN
membership on
the port?
Drop the
packet.
No
Yes
Forward the
packet on that
protocol VLAN.
Is the
port a member
of an untagged,
port-based
VLAN?
No
Drop the
packet.
Yes
Forward the
packet on the
port-based VLAN.
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