SVI (Switch Virtual Interface)

• It is used for Inter-Vlan routing
• Using SVI, without using a router, we can route packets to different networks and vlans

• Traditionally, switches send traffic only to hosts within the same broadcast domain (Single VLAN) and routers handled traffic between different broadcast domains (Different VLANs). This meant that network devices in different broadcast domains could not communicate without a router.
• With SVIs the switch will use virtual Layer 3 interface to route traffic to other Layer 3 interface thus eliminating the need for a physical router.
• VLANs reduce the load on a network by dividing a LAN into smaller segments and keeping local traffic within a VLAN. However, because each VLAN has its own domain, a mechanism is needed for VLANs to pass data to other VLANs without passing the data through a router.
• The solution is to use switched virtual interface – SVI.

REFERENCES:

- https://www.examcollection.com/certification-training/ccna-configure-intervlan-routing-svi-interfaces.html

- https://learningnetwork.cisco.com/thread/62241

- http://www.cisco.com/c/en/us/support/docs/lan-switching/inter-vlan-routing/41860-howto-L3-intervlanrouting.html