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A switched virtual interface (SVI) is a VLAN of switch ports represented by one interface to a routing or bridging system. There is no physical interface for the VLAN and the SVI provides the Layer 3 processing for packets from all switch ports associated with the VLAN. There is one-to-one mapping between a VLAN and SVI, thus only a single SVI can be mapped to a VLAN. By default, an SVI is created for the default VLAN (VLAN1) to permit remote switch administration. An SVI cannot be activated unless associated with a physical port. 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. SVIs advantages include: * Much faster than router-on-a-stick, because everything is hardware-switched and routed. * No need for external links from the switch to the router for routing. * Not limited to one link. Layer 2 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.〔(【引用サイトリンク】url=https://www.juniper.net/techpubs/en_US/junos11.1/topics/concept/bridging-routed-vlan-interface.html )〕 ==References== * Cisco Systems, 2006, "Building Cisco Multilayer Switched Networks" (Version 3.0), Cisco Systems Inc. * Data Centre Networking Module (COMH9003) | Cork Institute of Technology 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Switch virtual interface」の詳細全文を読む スポンサード リンク
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