Configuration Guide for Cisco NCS 1001, IOS XR Release 25.x.x

Controllers

Updated: July 27, 2026

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This topic explains controller identifiers and the rack, slot, instance, and port values that identify the optical controller locations in the system.

A controller identifier is a location value that

uses the Rack/Slot/Instance/Port format,
identifies the optical controller that you configure or display, and
uses values such as 0/1/0/1 for a specific controller location.

Controller identifier fields

Table 1. Controller identifier fields
Field	Value
Rack	0
Slot	1 to 3. These slots support pluggable optical modules.
Instance	0
Port	Depends on the specific pluggable optical module.

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