Prerequisites For Preconfiguring Physical Interfaces; Information About Preconfiguring Physical Interfaces; Physical Interface Preconfiguration Overview; Benefits Of Interface Preconfiguration - Cisco 6000 Series Configuration Manual

Prerequisites for Preconfiguring Physical Interfaces

Prerequisites for Preconfiguring Physical 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.
Before preconfiguring physical interfaces, be sure that the following conditions are met:
• Preconfiguration drivers and files are installed. Although it may be possible to preconfigure physical

Information About Preconfiguring Physical Interfaces

To preconfigure interfaces, you must understand the following concepts:

Physical Interface Preconfiguration Overview

Preconfiguration is the process of configuring interfaces before they are present in the system. Preconfigured
interfaces are not verified or applied until the actual interface with the matching location (rack/slot/module)
is inserted into the router. When the anticipated modular services card is inserted and the interfaces are created,
the precreated configuration information is verified and, if successful, immediately applied to the router's
running configuration.
Note When you plug the anticipated modular services card in, make sure to verify any preconfiguration with the
appropriate show commands.
Use the show run command to see interfaces that are in the preconfigured state.
Note
We recommend filling out preconfiguration information in your site planning guide, so that you can compare
that anticipated configuration with the actual preconfigured interfaces when that card is installed and the
interfaces are up.
Tip Use the commit best-effort command to save the preconfiguration to the running configuration file. The
commit best-effort command merges the target configuration with the running configuration and commits
only valid configuration (best effort). Some configuration might fail due to semantic errors, but the valid
configuration still comes up.

Benefits of Interface Preconfiguration

Preconfigurations reduce downtime when you add new cards to the system. With preconfiguration, the new
modular services card can be instantly configured and actively running during modular services card bootup.
Interface and Hardware Component Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
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interfaces without a preconfiguration driver installed, the preconfiguration files are required to set the
interface definition file on the router that supplies the strings for valid interface names.
Preconfiguring Physical Interfaces