Aswitch virtual interface (SVI) is a logical interface that ties Layer 3 functionality, such as IP inform VLAN. The SVI, in turn, can be used for inter-VLAN routing, to fallback-bridge nonroutable protoco VLANs, and to represent the VLAN to a routing domain. By default, an SVI is created for VLAN 1 foi management. If you are familiar with the Cisco 2900XL/3500XL series switches from CCIE PSV1, a much like the "interface VLAN 1" used for management. Unlike the previous switches, you can conf SVIs and a routing protocol to provide connectivity between the VLANs. To configure an SVI, aside single default, you must have the EMI software image installed on the switch.
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