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Switch 1
Switch 1 is set as follows:
1. On the Port Filtering Configuration screen, the Filter Using Port
VLAN Lists is set to YES for ALL ports.
2. The Forward Default VLAN Out All Ports is set to YES using the
Device/VLAN Configuration screen. This adds the Default VLAN to
the Port VLAN List of every switch port.
3. One VLAN is added to the list of VLANs in the Device/VLAN
Configuration screen. In this example, it is set as follows:
•
VLAN ID 224, FID 1, with a VLAN Name of Green
4. A Port VLAN ID is assigned to the switch ports as follows using the
Port Assignment screen:
•
Port 1, VLAN ID: 224 for the Green VLAN
•
Port 2, Port Mode: 1Q Trunk
•
Port 3, Port Mode: 1D Trunk
These settings change the configuration of the switch, so that Port 1 is
part of the Green VLAN and is set to transmit a frame type of
untagged. Port 2 is set as an 802.1Q Trunk port, which makes the port
eligible to transmit frames of all VLANs, and sets all frames
forwarded out this port to be tagged frames. Port 3 is set as a 1D Trunk
port, where frames classified as belonging to any VLAN are
forwarded untagged, and received frames are classified as belonging
to the Default VLAN.
4.3.2
Frame Handling
The following describes how, when User B attempts to contact the Mail
Server on Switch 1, the frames are classified on Switch 4 and traverse the
network.
1. User B sends a broadcast frame in an attempt to contact the Mail
Server. The frame enters Bridge 1 and, being a broadcast, is forwarded
to all ports. Bridge 1 learns User B's MAC address from the Source
Address field of the frame and adds it to its Source Address Table in
FID 1.
802.1Q VLAN User's Guide
Example 3
4-13
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