An SVI must be configured for each VLAN to enable routing between them. This requires assigning an IP address to each SVI that acts as the default gateway for the VLAN associated with it. Configuring an IP helper address, while useful for forwarding DHCP requests across networks, isn't specifically for routing between VLANs. Assigning an IP address to each physical interface or setting a native VLAN on a trunk link does not enable inter-VLAN routing.
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What is an SVI, and why is it important for VLAN routing?
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How does configuring a native VLAN on a trunk link differ from enabling inter-VLAN routing?