Loopback Interfaces; Tunnel Interfaces; High Availability - Cisco 7206 - VXR Router Configuration Manual

Information About Layer 3 Interfaces
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m
Figure 4-2
You can configure VLAN interface for inband management in the Cisco Nexus 7000 Series switches
Note
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,"

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
Connecting Two VLANs with VLAN interfaces
Nexus Switch
IP
VLAN
interface 1
VLAN 1
Host 1
VLAN
interface 10
VLAN 10
Host 2
for more information on IP tunnels.
Chapter 4 Configuring Layer 3 Interfaces
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