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Floor 3
Floor 2
4. When Switch 1 receives the tagged broadcast frame, it also examines
the tag and classifies the frame as belonging to the Red VLAN. This
broadcast frame is then sent to all ports eligible to receive Red VLAN
frames. In this case only the 1D trunk, Port 3, is eligible, as it is
considered a member of all VLANs for forwarding purposes. The
VLAN Tag is stripped from the frame and the frame is transmitted out
Port 3 as shown in Figure 4-10. The Source Address Table, FID 1 for
Switch 1 is updated to contain User B.
Floor 2
Green, Inc.
Floor 1
5. The Mail Server receives the broadcast frame and recognizes it. The
Mail Server responds with a unicast frame to User B. This frame
crosses the 1D Trunk and is received by Switch 1. Switch 1 classifies
the unicast frame as belonging to the Default VLAN (the only
membership for the 1D Trunk port).
802.1Q VLAN User's Guide
Bridge 3
1
Blue VLAN
Figure 4-9 Switch 2 Forwards to 1Q Trunk
1
Green VLAN
Figure 4-10 Switch 1 Forwards to 1D Trunk
2
Bridge 4
3
2
Red VLAN
4
2
Mail Server
3
1
4
Example 3
File Server
2263_19
2263_20
4-15
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