3Com corebuilder 3500 Implementation Manual page 196

196 C 9: V
HAPTER IRTUAL
Receive port is
untagged in a
VLAN that matches
No
theframe's protocol
type?
Assign
frame to
null VLAN
LAN
S
The flow chart in Figure 34 shows the VLAN ingress rules for the system
at Release 3.0.
Figure 34 Flow Chart for 3.0 Ingress Rules
Incoming Frame
No
Frame tagged?
Yes
No
Assign
frame to
matched
VLAN
Yes (Frame tagged with a VID)
VLAN
mode is
all Open?
A VLAN is
defined that
No
matches both
the frame's VID
and protocol
type?
Assign
frame to
null VLAN
To Egress rules
Receive port is
in aVLAN that
No
matches both the
frame's VID and
protocol type?
Yes
Yes
Yes
Assign
frame to
matched
VLAN
(Frame has been assigned to one
specific VLAN)