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4. Now that the ports have been assigned, the VLANs are enabled from
the Device/VLAN Configuration screen.
The switch will now classify each frame received as belonging to either
the Red or Blue VLANs. Traffic from one VLAN will not be forwarded to
the members of the other VLAN, and all frames transmitted by the switch
will be normal, untagged Ethernet frames.
4.1.2
Frame Handling
This section describes the operations of the switch when two frames are
received. The first frame is a broadcast sent by station R1.
1. Station R1 transmits the broadcast frame. The switch receives this
frame on Port 1. As the frame is received, the switch classifies it. The
frame is untagged, so the switch classifies it as belonging to the VLAN
that Port 1 is assigned to, the Red VLAN.
2. At the same time, the switch adds the source MAC address of the
frame and VLAN the associated port to its Source Address Table in
FID 2. In this fashion it learns that station R1 is located out Port 1.
802.1Q VLAN User's Guide
802.1Q Switch
R1
1
VLAN ID 002
R2
2
VLAN ID 002
3
R2
VLAN ID 002
Figure 4-2 Switch Configured for VLANs
B3
4
VLAN ID 003
B2
5
VLAN ID 003
6
B1
VLAN ID 003
2263_12
Example 1
4-3
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