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Cisco IOS XR Getting Started Guide
OL-10957-02
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
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 3-1 shows a sample rack number plan for a single-FCC system.
Table 3-1 Sample Rack Number Plan for a Single-FCC Multishelf System
Table 3-2 shows a sample rack number plan for a two-FCC system.
OUTPUT
FAIL
FAN
OK
INPUT
OK
OUTPUT
FAIL
FAN
OK
INPUT
OK
138118
Gigabit Ethernet Control Bus
OUTPUT
FAIL
FAN
OK
INPUT
OK
OUTPUT
FAIL
FAN
OK
INPUT
OK
SC
Fabric Cards
SC
Fabric Cards
Line Card Chassis
Rack 1
Line Card Chassis
Rack 0
Fabric Card Chassis
Rack F0
SM1
SM2
SM3
SM0
SM7
SM4
OIM22
OIM21
OIM15
OIM13
OIM12
OIM14
OIM23
OIM-LED 1
OIM16
RP (SC)
RP (SC)
OIM22
OIM21
OIM15
OIM13
OIM12
OIM14
OIM23
OIM-LED 1
OIM16
SM1
SM2
SM3
SM0
SM7
SM4
OIM22
OIM21
OIM15
OIM13
OIM12
OIM14
OIM23
OIM-LED 1
OIM16
RP (SC)
RP (SC)
OIM22
OIM21
OIM15
OIM13
OIM12
OIM14
OIM23
OIM-LED 1
OIM16
DSC
Catalyst 6509 Switches
Chassis Serial ID Rack Number
LCC containing the active DSC 0
Non-DSC LCC 1
Fabric chassis F0