How to Pack Your Trunk for the Trip to the Other Switch

How to Pack Your Trunk for the Trip to the Other Switch

To explain the other use of the term "trunk," Figure 7-8 adds VLANs to the network from Figure 7-7. As shown in previous figures, Fred and Barney are in one VLAN, and Betty and Wilma are in another VLAN. However, now the traffic in both VLANs must cross over the trunk between two switches. When a switch receives a frame over that trunk, it could be confused about which VLAN's MAC address table to use when deciding how to forward the frame. Figure 7-8 shows the sample network and the dilemma that switch2 faces upon receipt of the frame that Fred sent to Barney.