I am learning about switching and came across SVI in vlans ,I Googled and watched couple videos and got really confusing Firsly where do we use Svi? and why do we use it,How to configure svi and what are the benefits of using svi, How to determine svi on a cisco or Nexus Switch .please any help is highly appreciated.
An SVI is a Switched Virtual Interface. It is an interface for the VLAN itself on the switch. It can be a layer-3 interface (IP addressing) to allow the switch itself to participate in the VLAN.
A layer-2 switch can use a layer-3 SVI as its management interface, and it would also need a default gateway in the VLAN to allow the management interface to be reached from other networks through the router at the default gateway address.
For a layer-3 switch, a layer-3 SVI is a gateway for the VLAN. It is a virtual router interface, allowing traffic from the VLAN of the SVI to be routed to and from other networks, e.g. other layer-3 SVIs or router interfaces configured on the layer-3 switch.