Cisco Router IOS XR Getting Started Manual page 42

Information About Bringing Up a Multishelf System
Figure 3-1 DSC in a CRS-1/M-F1 Multishelf System
Line Card Chassis
Rack 1
Chassis, shelf, and rack are used interchangeably. Each term refers to the physical tower that contains
Note
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
Table 3-1
Chassis
LCC containing the active DSC
Non-DSC LCC
Fabric chassis
Table 3-2
Cisco IOS XR Getting Started Guide
3-4
Gigabit Ethernet Control Bus
Fabric Card Chassis
Rack F0
3-3.
shows a sample rack number plan for a single-FCC system.
Table 3-1
shows a sample rack number plan for a two-FCC system.
Chapter 3 Bringing Up the Cisco IOS XR Software on a Multishelf System
Catalyst 6509 Switches
Line Card Chassis
Rack 0
Sample Rack Number Plan for a Single-FCC Multishelf System
Serial ID
INPUT OK OK FAN OUTPUT FAIL INPUT OK OK FAN FAIL OUTPUT INPUT OK OK FAN OUTPUT FAIL OK INPUT OK FAN OUTPUT FAIL
DSC
Table 3-1, Table 3-2, and
Rack Number
0
1
F0
OL-10957-02