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Example 2, VLANs Across Multiple Switches
VLAN Operation and Network Applications 12-31
Figure 12-15 Transmitting to Bridge 4
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 FDB ID 2. 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.
Floor 2
30691_72
Floor 3
1
3
2
Bridge 3
Bridge 4
Redco
Blue Industries
Red VLAN
Red VLAN
Blue VLAN
Blue VLAN
File Server
2