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Cisco CRS-1 Carrier Routing System 16-Slot Multishelf System Site Planning Guide
OL-7422-04
1
Cisco CRS-1 16-Slot Multishelf System Overview
This chapter describes the Cisco CRS-1 16-Slot Carrier Routing System Multishelf System. Various
configurations of the 16-slot multishelf system (MSS) exist. This publication describes 16-slot MSS and
16-slot fabric card chassis (FCC) site planning considerations. A 16-slot MSS is made up of
Cisco CRS-1 16-slot FCCs and Cisco CRS-1 16-slot LCCs. Older configurations also include Cat6509
switches.
The multishelf system is made up of two LCCs and up to four FCCs. Older MSS configurations include
one or two Cat6509 switches, which provide the control network for the MSS. Note that two Cat6509
switches are required for redundancy. Current releases of the FCC include one or two 22-port shelf
controller Gigabit Ethernet (22-Port SCGE) cards, which provide the control network for the multishelf
system. Note that two 22-Port SCGE cards are required for redundancy.
Note If your FCCs are equipped with 22-Port SCGE cards, your MSS does not require Cat6509 switches.
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. The following sections describe each of the major
components:
• Fabric Card Chassis Components, page 1-4
• Line Card Chassis Components, page 1-7
• Multishelf System Control Network (Cisco Catalyst 6509 Switch), page 1-9
• Multishelf System Control Network (22-Port SCGE Cards), page 1-9