Cisco N7K-C7010 Configuration Guide - Page 111
VLAN Interfaces
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Chapter 4 Configuring Layer 3 Interfaces Information About Layer 3 Interfaces Send document comments to [email protected] Figure 4-1 shows a trunking port from a switch that connects to router B on interface E 2/1. This interface contains three subinterfaces that are associated with each of the three VLANs carried by the trunking port. Figure 4-1 Subinterfaces for VLANs SSwwiittcchh AA VVLLAANN1100 VVLLAANN2200 VVLLAANN3300 ee11//11 TTrruunnkk ee22//11 ee 22//11..1100 ee 22//11..2200 ee 22//11..3300 RRoouutteerr BB 118866112222 For more information on VLANs, see the Cisco Nexus 7000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.x. VLAN Interfaces A VLAN interface or switch virtual interfaces (SVI), 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, Cisco NX-OS creates a VLAN interface for the default VLAN (VLAN 1) to permit remote switch administration. You must enable the VLAN network interface feature before you can see configure it. Beginning in Cisco NX-OS Release 4.2, the system automatically takes a checkpoint prior to disabling the feature, and you can rollback to this checkpoint. See Cisco Nexus 7000 Series NX-OS System Management Configuration Guide, Release 5.x, for information on rollbacks and checkpoints. You must configure the VLAN network interface in the same VDC as the VLAN. Note You cannot delete the VLAN interface for VLAN 1. You can route across VLAN interfaces to provide Layer 3 inter-VLAN routing by configuring a VLAN interface for each VLAN that you want to route traffic to and assigning an IP address on the VLAN interface. For more information on IP addresses and IP routing, see the Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 5.x. Figure 4-2 shows two hosts connected to two VLANs on a device. You can configure VLAN interfaces for each VLAN that allows Host 1 to communicate with Host 2 using IP routing between the VLANs. VLAN 1 communicates at Layer 3 over VLAN interface 1and VLAN 10 communicates at Layer 3 over VLAN interface 10. OL-23435-03 Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x 4-3