Router Installation Guide

1-29
Cisco XR 12416 Router Installation Guide
OL-13833-01
Chapter 1 Product Overview
Route Processor
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 (called bootflash)—Contains the Cisco IOS boot
image
• Flash memory disks (or cards)—Contain the Cisco IOS software image
Table 1-3 lists supported flash disk sizes and Cisco part numbers.
Table 1-3 Supported Flash Disk Sizes
Flash Disk Size
1
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.
Part Number
64 MB
2
2. Default shipping configuration.
MEM-12KRP-FD64=
128 MB MEM-12KRP-FD128=
1 GB MEM-12KRP-FD1G=