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■ To support routing protocol and bridging configurationsīy default, an SVI is created for the default VLAN (VLAN1) to permit remote switch administration. ■ To provide Layer 3 IP connectivity to the switch ■ To provide fallback bridging if it is required for nonroutable protocols ■ To provide a default gateway for a VLAN so that traffic can be routed between VLANs You configure an SVI for a VLAN for these reasons: Only one SVI can be associated with a VLAN.
The SVI for the VLAN provides Layer 3 processing for packets from all switch ports associated with that VLAN. It is "virtual" in that there is no physical interface for the VLAN, and yet it can accept configuration parameters applied to any Layer 3 router interface.
An SVI is a virtual Layer 3 interface that can be configured for any VLAN that exists on a Layer 3 switch.
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