Example 2, VLANs Across Multiple Switches

Figure 12-15 Transmitting to Bridge 4

Floor 3

Blue Industries

 

Redco

 

 

 

2

File Server

Bridge 3

2

Bridge 4

3

 

1

 

Blue VLAN

 

Red VLAN

 

Floor 2

 

 

 

 

 

 

30691_72

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.

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Enterasys Networks 2H258, 2E253, 2H253, 2H252 manual Transmitting to Bridge