Cisco Systems Cisco IOS XR manual Restrictions, Hardware Requirements

Chapter 3 Bringing Up the Cisco IOS XR Software on a Multishelf System

Restrictions

•ROMMON 1.40 or higher on each RP in the system

Caution The ROM Monitor software must be upgraded to version 1.42 or a later version on all RPs before a Cisco CRS-1 system is upgraded to Cisco IOS XR Software Release 3.4.0 or a later release. If the router is brought up with an incompatible version of the ROM Monitor software, then the standby RP may fail to boot. For instructions to overcome a boot block in the standby RP in a single-chassis system, see Cisco IOS XR ROM Monitor Guide. If a boot block occurs in a multishelf system, contact your Cisco Systems support representative for assistance. See Obtaining Technical Assistance, page xiv.

In addition, Cisco CRS-1 multishelf systems should be upgraded to ROMMON release 1.40 before being upgraded to Cisco IOS XR Release 3.4.0 to ensure that RPs are assigned the correct rack numbers during system boot.

For more information, see Cisco IOS XR ROM Monitor Guide.

Hardware Requirements

Before you can bring up a multishelf system, the system components must be physically installed and tested. Three multishelf system configurations are supported, and they require the following components:

•Two 16-slot line card chassis containing eight FC/M (S13) fabric cards

•Two external Gigabit Ethernet Cisco Catalyst 6509 switches

Single-FCC systems require one FCC containing eight SFC (S2) fabric cards. Two-FCC systems require two FCCs, and four-FCC systems require four FCCs. In two- and four-FCC configurations, the eight SFC (S2) fabric cards are distributed equally in the FCCs.

For instructions to install, cable, and verify a multishelf system, see the documents listed on the Cisco CRS-1 documentation web page listed in the “Related Documents” section on page x.

Restrictions

The following restrictions apply to multishelf systems in Cisco IOS XR Software Release 3.4.0.

•The multishelf system supports:

–Two 16-slot line card chassis.

–One, two, or four FCCs.

–Two external Catalyst switches to form a control Ethernet plane used for administrative management and monitoring of the system.

•The 4-slot and 8-slot LCCs are not supported.

•Although Cisco IOS XR Software Release 3.4.0 supports the addition of a second line card chassis, the removal of a line card chassis is restricted. Consult your Cisco Systems support representative for more information (see the “Obtaining Technical Assistance” section on page xiv).

Cisco IOS XR Getting Started Guide

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