Switch Virtual Interface Concept Inside a Switch
A typical Layer 2 Cisco Nexus 5500 switch can use only one Layer 3 VLAN interface (SVI) without a Layer 3 module or license, but the network engineer can choose which VLAN interface to enable this on (typically VLAN 1). All interfaces on a Cisco Nexus switch belong to a Virtual Routing and Forwarding (VRF) instance called Default, except for the management interface, which belongs to the Management VRF. Within the “default” VRF, the network engineer can configure a single Layer 3 interface called a switched virtual interface (SVI). Example 8-5 shows the configuration of an SVI on VLAN 1.
Note
Some Cisco switches, called Layer 2 switches, forward Ethernet frames, as discussed in depth in Chapter ...
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