Why Trunks

When all of the Catalysts in a network support one VLAN and need connectivity, you can establish links between the Catalysts to transport intra-VLAN traffic. One approach to interconnecting Catalysts uses links dedicated to individual VLANs. For example, the network in Figure 8-1 connects several Catalysts together. All of the Catalyst configurations include only one VLAN—all ports belong to the same VLAN. Catalysts A and B interconnect with two direct links for resiliency. If one link fails, Spanning Tree enables the second link.

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