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4-4
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 4 Configuring Layer 3 Interfaces
Information About Layer 3 Interfaces
Figure 4-2 Connecting Two VLANs with VLAN interfaces
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.
VLAN
interface 1
VLAN
interface 10
Nexus Switch
VLAN 10VLAN 1
IP
Host 1 Host 2
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