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Chapter 4: Examples
Floor 3
Blue Industries
Floor 2
4. The File Server responds with a unicast frame to User A. All switches
between the File Server and User A have an entry in their respective
Source Address Tables identifying which port to use for forwarding
the frame to User A, MAC address "Y" in FID 3. All switches update
their Source Address Tables for the File Server's MAC address "Z" as
the frame is forwarded through the switch fabric to User A. The
802.1D switches update their Source Address Tables based on the
source MAC address and receive port and the 802.1Q switches update
their databases based on the source MAC address, VLAN, and receive
port.
5. The frame from the File Server is received on Switch 2, and forwarded
to Switch 1 as a tagged frame classified as belonging to the Red
VLAN. Switch 1 removes the tag and forwards the frame to Bridge 1,
which in turn forwards the frame out of the port attached to User A.
All subsequent frames between User A and the File Server are
forwarded through the switch fabric in the same manner.
4-10
2
Bridge 3
2
1
Blue VLAN
Figure 4-6 Transmitting to Bridge 4
Redco
Bridge 4
3
Red VLAN
802.1Q VLAN User's Guide
File Server
2263_16
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