Selecting And Identifying The Designated Shelf Controller; Selecting And Identifying The Dsc On Cisco Xr 12000 And 12000 Series Routers; Verifying The Dsc - Cisco XR 12000 Series Getting Started Manual

Chapter 1 Introduction to Cisco IOS XR Software

Selecting and Identifying the Designated Shelf Controller

The designated shelf controller (DSC) controls a standalone router or a multishelf system. A DSC is a
role that is assigned to one performance route processor (PRP) card in each router . A DSC is a role that
is assigned to one performance route processor (PRP) card in each router or multishelf system. PRP
cards operate in Cisco XR 12000 and 12000 Series Routers.
Note Throughout this guide, the term PRP is used to refer to the PRP cards supported on
Cisco XR 12000 Series Routers. Cisco XR 12000 Series Routers, support both the PRP-2 and the
PRP-3 cards. If a feature or an issue applies to only one platform, the accompanying text specifies the
platform.
Although each router can have two RP cards, only one can serve as the DSC and control the router. The
DSC provides system-wide administrative functions, including:
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The first step in setting up a new router is to select or identify the DSC because the initial router
configuration takes place through the DSC. The following sections describe how to select and identify
the DSC on different routers:
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Selecting and Identifying the DSC on Cisco XR 12000 and 12000 Series Routers

A Cisco XR 12000 Series Router or Cisco 12000 Series Internal Router supports multiple PRPs. When
the router is started for the first time, the PRP in the slot with the lowest number becomes the active PRP
and is identified by the alphanumeric display: ACTV RP. The active PRP serves as the DSC. If another
PRP is configured as a standby PRP for the DSC, that PRP can assume the DSC role if the DSC fails.
To have a PRP in a higher-numbered slot become the DSC, you must bring up the router with only that
PRP installed. After the chosen PRP becomes the DSC, it remains the DSC after subsequent restarts and
you can add the other PRPs.
Additional PRPs can be installed to host secure domain routers (SDRs), which are introduced in
Note
Chapter 3, "Configuring General Router Features."
connect to the DSC. To configure SDR features, you must connect to the PRP for the appropriate SDR.

Verifying the DSC

Use the show dsc command to verify which RP is acting as the primary DSC for the router or routing
system.
The following example shows sample output of the show dsc command on a
Cisco XR 12000 Series Router:
OL-24755-01
User configuration using a terminal connection or network connection
Distribution of software to each node in the router or system
Coordination of software versioning and configurations for all nodes in the router or system
Hardware inventory and environmental monitoring
Selecting and Identifying the DSC on Cisco XR 12000 and 12000 Series Routers, page 1-9
Verifying the DSC, page 1-9

Selecting and Identifying the Designated Shelf Controller

To configure general router features, you must
Cisco IOS XR Getting Started Guide for the Cisco XR 12000 Series Router
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