Cisco Systems Cisco IOS XR Chassis Serial ID Rack Number, DSC in a CRS-1/M-F1 Multishelf System

Chapter 3 Bringing Up the Cisco IOS XR Software on a Multishelf System

Information About Bringing Up a Multishelf System

Figure 3-1 DSC in a CRS-1/M-F1 Multishelf System

Gigabit Ethernet Control Bus

RP (SC)

RP (SC)

Fabric Cards SC

Fabric Cards SC

RP (SC)

RP (SC)

Catalyst 6509 Switches

DSC

Line Card Chassis	Fabric Card Chassis	Line Card Chassis
Rack 1	Rack F0	Rack 0

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Note Chassis, shelf, and rack are used interchangeably. Each term refers to the physical tower that contains the installed cards, power, and cooling equipment. In general, chassis describes the system components. Rack is used in software to assign a rack number to each chassis.

A rack number plan lists each chassis in a system with the correct chassis serial ID and an assigned rack number. The serial ID is the chassis serial number, which can be accessed by the software and uniquely identifies the chassis. The rack number for an LCC is a number in the range of 0 to 255, which is easier to remember and read than serial numbers in display messages.

The rack number plan is used during the startup and configuration of Rack 0. The LCC that hosts the DSC must be configured as Rack 0. The non-DSC LCC must be configured to use a rack number in the range of 1 to 255. FCC rack numbers range from F0 to F3, as shown in Table 3-1, Table 3-2, and Table 3-3.

Table 3-1shows a sample rack number plan for a single-FCC system.

Table 3-1	Sample Rack Number Plan for a Single-FCC Multishelf System
Chassis		Serial ID	Rack Number
LCC containing the active DSC			0
Non-DSC LCC			1
Fabric chassis			F0

Table 3-2shows a sample rack number plan for a two-FCC system.

Cisco IOS XR Getting Started Guide

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