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Cisco CRS-1 Carrier Routing System Multishelf System Upgrade and Conversion Guide
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Chapter2 Converting to an Integrated Switch System
Prerequisites for the Integrated Switch System
Prerequisites for the Integrated Switch System
Hardware Requirements
•Ensure that all fabric card chassis (FCCs) have two power shelves and that all three power entry
modules (PEMs) in each power shelf are running c orrectly. During the conversion, when one 22-port
SCGE is removed, the chassis must have both power shelves populated to keep all the fans in the
chassis engaged.
•Two 22-port SCGE per fabric chassis.
•Four 22-port SCGE for a Two-FCC Multishelf System.
•Eight 22-port SCGE for a Four-FCC Multishelf System.
Software Requirements
•Cisco IOS XR Software Release 3.4.1 to support 2 2-port SCGE.
•ROMMON version 1.43 or higher
Caution Before performing the procedures that are described in this chapter, it is important to wait until the
previous step is completed before attempting the next step. Failure to do so can result in a failure of the
migration procedure. If a previous step fails to complete successfully, contact Cisco Technical Support
before proceeding. We do not have a rollover procedure defined.
Cisco CRS-1 Multishelf Conversion to an Integrated Switch System Introduction
The first implementation of the CiscoCRS-1 Multishelf System, the interrack control network was
established by connecting the GE ports on each LCCs route processor (RP) to two external
Cisco Catalyst 65xx switches, which, in turn, were connected to the FCCs’ shelf controller (SC) cards.
Two Cisco Catalyst 65xx switches were used to achieve redundancy, and Rapid Spanning Tree Protocol
(RSTP) was used to ensure a loop-free topology.
In the first release of the Cisco CRS-1 Multishelf System (running Cisco IOSXR Software
Release 3.2.50), two CiscoCatalyst 65xx switches are interconnected to the multishelf’s fabric card
chassis (FCC0, FCC1, FCC2, and FCC3) and two line card chassis (LCC0 and LCC1) to form the
interchassis control network.
The 22-port SCGE card replaces the current 2-port SCGE card in the multishelf system (MSS) FCC. The
22-port SCGE card contains built-in bundled Gigabit Ethernet (GE) switches. The 22-port SCGE card is
designed to integrate the functionality of the two Cisco Catalyst 65xx switches. With the new 22-port
SCGE card, all Layer 2 system switching is now bundled and integrated into the Cisco CRS-1 router. On
the 22-port SCGE card, there are 22 ports available on the front panel. Each port on the 22-port SCGE
card has two LEDs, which indicate port activity and link state.
When the 22-port SCGE cards are installed, the control network topology ceases to be a simpl e
hub-and-spoke set of connections.