Cisco N7K-C7010 Configuration Guide - Page 112
Loopback Interfaces, Tunnel Interfaces, High Availability
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Information About Layer 3 Interfaces Chapter 4 Configuring Layer 3 Interfaces Send document comments to [email protected] Figure 4-2 Connecting Two VLANs with VLAN interfaces Nexus Switch VLAN interface 1 IP VLAN interface 10 VLAN 1 VLAN 10 186123 Host 1 Host 2 Note You can configure VLAN interface for inband management in the Cisco Nexus 7000 Series switches with the F1 Series modules in the chassis. Loopback Interfaces A loopback interface is a virtual interface with a single endpoint that is always up. Any packet transmitted over a loopback interface is immediately received by this interface. Loopback interfaces emulate a physical interface. You can configure up to 1024 loopback interfaces per VDC, numbered 0 to 1023. You can use loopback interfaces for performance analysis, testing, and local communications. Loopback interfaces can act as a termination address for routing protocol sessions. This loopback configuration allows routing protocol sessions to stay up even if some of the outbound interfaces are down. Tunnel Interfaces Cisco NX-OS supports tunnel interfaces as IP tunnels. IP tunnels can encapsulate a same-layer or higher layer protocol and transport the result over IP through a tunnel created between two routers. See Chapter 8, "Configuring IP Tunnels," for more information on IP tunnels. High Availability Layer 3 interfaces support stateful and stateless restarts. After the switchover, Cisco NX-OS applies the runtime configuration after the switchover. See the Cisco Nexus 7000 Series NX-OS High Availability and Redundancy Guide, Release 5.x, for complete information on high availability. Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x 4-4 OL-23435-03