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The following steps show how a Cisco 3750 is configured for zone-level layer-3 switching. These steps assume VLAN 201 is used to route untagged private IPs for pod 1, and pod 1’s layer-2 switch is connected to GigabitEthernet1/0/1. Setting VTP mode to transparent allows us to utilize VLAN IDs above 1000. Since we only use VLANs up to 999, vtp transparent mode is not strictly required. vtp mode transparent vlan 200-999 exit Configure GigabitEthernet1/0/1. interface GigabitEthernet1/0/1 switchport trunk encapsulation dot1q switchport mode trunk switchport trunk native vlan 201 exit The statements configure GigabitEthernet1/0/1 as follows: VLAN 201 is the native untagged VLAN for port GigabitEthernet1/0/1. Cisco passes all VLANs by default. As a result, all VLANs (300-999) are passed to all the pod-level layer-2 switches.