SVI (Switch Virtual Interface)

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VLAN-interface, also known as SVI (Switch Virtual Interface) or RVI (Routed VLAN Interface) - a virtual interface multilevel switch. It provides routing and often serves as the default gateway for the local network segment. VLAN-interface behaves normally and is configured as a physical router interface: it is possible to assign IP, it participates in the VRRP, etc. can have ACL. You can imagine that this is a physical interface within the switch, and can, on the contrary, imagine that this is the switch routing interface, which terminates the VLAN.


To switch can route traffic between the VLAN, you need to:

enable ip routing corresponding VLAN must be created must be created corresponding VLAN interface (switched virtual interfaces)

SVI-interface:

It is, belonging to VLAN ports as one interface to the routing and switching functions in the system; created when the interface vlan; It supports routing protocols.

SVI-interface is in state up, if the three conditions are satisfied:

VLAN, which corresponds SVI, and there is an active switch in VLAN database SVI is not turned off administrative At least one level 2 interface belongs to the corresponding VLAN, it is in the up state and the STP forward.

Creating SVI interface and state:

If you create a VLAN interface, but does not create the corresponding VLAN and does not include ip routing, the port will be able to "down down". After you create the corresponding VLAN, the port is able to "up down".

SVI autostate

Default SVI-interface switches to "down", if all of the interfaces that go into VLAN'a "down" state. Port can be excluded from checking the availability of the SVI-interface. To do this, use switchport autostate exclude command. Once the command applies to all VLAN, which are included in the interface. This can be useful for when a switch port is connected to the traffic analyzer or IDS.


SVI on Cisco Integrated Services Routers is designed to provide basic Layer 3 functions for the Layer 2 switch ports that belong to a specific VLAN. The SVI does not provide the same feature set and functions as the integrated Layer 3 Ethernet ports of the integrated services routers and should not be used to entirely replace the Layer 3 Ethernet ports. Customer who need additional Layer 3 Ethernet ports for their Integrated Services Routers may consider the use of 1- and 2-Port Fast Ethernet High-Speed WIC for modular ISR platforms. The guidelines presented in this document summarize feature support considerations for an Integrated Services Router deployment that uses SVIs.


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