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Reverted edits by 185.233.181.166 (talk) (HG) (3.4.13)

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{{short description|Logical layer-3 interface on a switch}}
{{No footnotes|date=June 2021}}

A '''switch virtual interface''' ('''SVI''') represents a logical layer-3 interface on a switch.

VLANs divide broadcast domains in a LAN environment. Whenever hosts in one VLAN need to communicate with hosts in another VLAN, the traffic must be routed between them. This is known as inter-VLAN routing. On [[layer-3 switch]]es it is accomplished by the creation of layer-3 interfaces (SVIs). Inter VLAN routing, in other words routing between VLANs, can be achieved using SVIs.<ref>{{Cite web|last=Hamza|first=Arif|date=14 September 2021|title=Switch Virtual Interfaces|url=https://ciscoeducation.com/switch-virtual-interfaces-configuration/|website=Cisco Education}}</ref>

SVI or VLAN interface, is a virtual routed interface that connects a VLAN on the device to the Layer 3 router engine on the same device. Only one VLAN interface can be associated with a VLAN, but you need to configure a VLAN interface for a VLAN only when you want to route between VLANs or to provide IP host connectivity to the device through a virtual routing and forwarding (VRF) instance that is not the management VRF. When you enable VLAN interface creation, a switch creates a VLAN interface for the default VLAN (VLAN 1) to permit remote switch administration.

SVIs are generally configured for a VLAN for the following reasons:
* Allow traffic to be routed between VLANs by providing a [[default gateway]] for the VLAN.
* Provide fallback bridging (if required for non-routable protocols).
* Provide Layer 3 IP connectivity to the switch.
* Support bridging configurations and routing protocol.
* Access Layer - 'Routed Access' Configuration (in lieu of Spanning Tree)

SVIs advantages include:
* Much faster than [[Router on a stick|router-on-a-stick]], because everything is hardware-switched and routed.
* No need for external links from the switch to the [[router (computing)|router]] for routing.
* Not limited to one link. Layer 2 [[EtherChannel|EtherChannels]] can be used between the switches to get more bandwidth.
* Latency is much lower, because it does not need to leave the switch

An SVI can also be known as a Routed VLAN Interface (RVI) by some vendors.<ref>{{cite web|title=Understanding Routed VLAN Interfaces on EX Series Switches|url=https://www.juniper.net/techpubs/en_US/junos11.1/topics/concept/bridging-routed-vlan-interface.html|accessdate=29 May 2013}}</ref>

==References==
* [[Cisco Systems]], [https://www.cisco.com/c/en/us/support/docs/lan-switching/inter-vlan-routing/41860-howto-L3-intervlanrouting.html Configure InterVLAN Routing on Layer 3 Switches]
*[[Cisco Systems]], [https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-director/network-devices-mgmt-guide/5-3/b_Network_Devices_Management_Guide_53/b_Network_Devices_Management_Guide_50_chapter_011100.pdf Configuring SVI]
*[[Cisco Systems]], 2006, "Building Cisco Multilayer Switched Networks" (Version 3.0), Cisco Systems Inc.
*[https://ciscoeducation.com/switch-virtual-interfaces-configuration/ Switch Virtual Interfaces (SVI) configuration]
{{Reflist}}
* Data Centre Networking Module (COMH9003) | Cork Institute of Technology

[[Category:Computer networking]]

{{compu-network-stub}}

Switch virtual interface - Revision history

imported>REDACTED403: Reverted edits by 185.233.181.166 (talk) (HG) (3.4.13)