Cisco Systems XR 12410 manual PRP Nvram

Chapter 4 Troubleshooting the Installation

Troubleshooting the Processor Subsystem

PRP NVRAM

Non-volatile Random Access Memory (NVRAM) provides 2 MB of memory for system configuration files, software register settings, and environmental monitoring logs. Built-in lithium batteries retain the contents of NVRAM for a minimum of 5 years. NVRAM is not user configurable and cannot be upgraded in the field.

PRP Flash Memory

Use flash memory to store multiple Cisco IOS XR software and microcode images that you can use to operate the router. You can download new images to flash memory over the network (or from a local server) to replace an existing image, or to add it as an additional image. The router can be booted (manually or automatically) from any of the stored images in flash memory.

Flash memory also functions as a Trivial File Transfer Protocol (TFTP) server to allow other servers to boot remotely from the stored images, or to copy them into their own flash memory.

The system uses two types of flash memory:

•Onboard flash memory (bootflash)—Contains the Cisco IOS XR boot image

•Flash memory disks (or cards)—Contain the Cisco IOS XR software images Table 4-4lists supported flash disk sizes and Cisco part numbers.

Table 4-4 Supported Flash Disk Sizes

Flash Disk Size1	Part Number
64 MB2	MEM-12KRP-FD64=
128 MB	MEM-12KRP-FD128=
1 GB	MEM-12KRP-FD1G=

1.Standard Type 1 and Type 2 linear flash memory cards also are supported, although they may not have the capacity to meet the configuration requirements of your system.

2.Default shipping configuration.

	Cisco XR 12410 Router Installation Guide
OL-13832-01		4-23