CHAPTER 8
Configuring V irtual Loopback and Null Interfaces
This module describes the configuration of loopback and null interfaces on the Cisco NCS 6000 Series Router.
Loopback and null interfaces are considered virtual interfaces.
A virtual interface represents a logical packet switching entity within the router. Virtual interfaces have a
global scope and do not have an associated location. Virtual interfaces have instead a globally unique numerical
ID after their names. Examples are Loopback 0, Loopback 1, and Loopback 99999. The ID is unique per
virtual interface type to make the entire name string unique such that you can have both Loopback 0 and Null
0.
Loopback and null interfaces have their control plane presence on the active route processor (RP). The
configuration and control plane are mirrored onto the standby RP and, in the event of a switchover, the virtual
interfaces move to the ex-standby, which then becomes the newly active RP.
Feature History for Configuring Loopback and Null Interfaces
ModificationRelease
This feature was introduced on the Cisco NCS 6000 Series Router.Release 5.0.0
• Prerequisites for Configuring Virtual Interfaces, on page 103
• Information About Configuring Virtual Interfaces, on page 103
• How to Configure Virtual Interfaces, on page 105
• Configuration Examples for Virtual Interfaces, on page 109
Prerequisites for Configuring Virtual Interfaces
You must be in a user group associated with a task group that includes the proper task IDs. The command
reference guides include the task IDs required for each command. If you suspect user group assignment is
preventing you from using a command, contact your AAA administrator for assistance.
Information About Configuring Virtual Interfaces
To configure virtual interfaces, you must understand the following concepts:
Interface and Hardware Component Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
103
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