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Cisco IOS XR Getting Started Guide
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Chapter 1 Introduction to Cisco IOS XR Software
Cisco CRS-1 Multishelf System Overview
Note Many cards operate in both Cisco XR 12000 Series routers and in Cisco 12000 Series routers. For the
latest information on which cards are supported by the Cisco IOS XR software in Cisco XR 12000 Series
routers and Cisco 12000 Series routers, see Release Notes for Cisco IOS XR Software Release 3.4.
The Cisco IOS XR software also runs on Cisco CRS-1 Multishelf Systems, which are described in the
following section.
Cisco CRS-1 Multishelf System Overview
The multishelf system enables multiple Cisco CRS-1 LCCs to act as a single system. This release of the
multishelf system supports two 16-slot LCCs and one, two, or four fabric card chassis (FCCs) to provide
a total switching capacity of up to 1.28 terabits per second (Tbps). Two external Cisco Catalyst switches
provide control-plane connectivity between the chassis.
Figure 1-1 shows the single-FCC multishelf system, Figure 1-2 shows the two-FCC multishelf system,
and Figure 1-3 shows the four-FCC multishelf system.
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