Agency Approvals, ROM Monitor Overview | Cisco Systems VIP4 instruction

Agency Approvals

The microcode boot image in the PROM initializes the VIP4 and then assists downloading the VIP4 microcode image. All interfaces of the same type (VIP4, and so on) will load the same microcode image, either from the microcode image bundled with the Cisco IOS or from an image stored in system Flash memory. Although multiple microcode versions for a specific interface type can be stored concurrently in Flash memory, only one image can load at startup.

The show controllers cbus command displays the currently loaded and running microcode version for each interface processor and VIP4. The show startup-configEXEC command shows the current system instructions for loading microcode at startup.

Software and interface processor microcode images are carefully optimized and bundled to work together. Overriding the bundle can result in system incompatibilities. We recommend that you use the microcode included in the software bundle. For a complete description of microcode and downloading procedures, refer to the “Upgrading VIP4 Microcode” section on page 28 .

ROM Monitor Overview

The VIP4 read-only memory (ROM) monitor, known as Rommon, is firmware. It runs a brief set of system diagnostics, initializes the VIP4 hardware, and downloads a copy of the Cisco IOS image.The ROM monitor loads the Cisco IOS image from Flash memory or from a TFTP server. While multiple Cisco IOS images can be stored in RSP Flash memory, just one can be loaded at system startup.

The VIP4 ROM monitor functions similarly to the boot loader image on the RSP, which runs a copy of the Cisco IOS image. The boot loader image allows the router to access the Cisco IOS image when powering up or initializing the system.

Tools and Parts Required

You need the following tools and parts to install or upgrade a VIP4:

•Number 1 Phillips and a 3/16-inch flat-blade screwdriver

•ESD-prevention equipment or disposable grounding wrist strap, included with all Cisco products

•VIP4 (For specific compatibility requirements, see the “Software Requirements” section on page 9 .)

Note The VIP4 requires at least one port adapter installed in order to be supported. A single-width port adapter must have a blank port adapter installed in the empty port adapter slot location.

If you need additional equipment, contact a service representative for ordering information.