1-4
Cisco AS5350 and Cisco AS5400 Universal Gateway Software Configuration Guide
OL-3418-02 B0
Chapter 1
Understanding Basic Hardware Architecture and Cisco IOS Software
Exploring the Cisco IOS File System
Figure 1-2
illustrates the memory locations and
Table 1-1
describes the memory locations.
Figure 1-2
Cisco AS5350 and Cisco AS5400 Memory Locations
Table 1-1
Memory Location Descriptions
Component
Description
CPU
250 MHz (Cisco AS5350 and Cisco AS5400)
390 MHz (Cisco AS5400HPX)
Processor memory
The Cisco IOS image is initially read out of Flash
memory, decompressed, and loaded into processor
memory (also known as main memory or DRAM).
Routing tables, call control blocks, and other data
structures are also stored here.
Packet I/O memory
Packets are temporarily stored in I/O memory.
System Flash and boot Flash memory
Memory that stores Cisco IOS images, modem
firmware/portware, and custom web pages.
NVRAM memory
Nonvolatile configuration memory that retains its
contents when a unit is powered off.
CPU
(R7000)
System Flash
memory
35922
Processor
memory
Boot Flash
memory
Pocket I/O
memory
NVRAM
memory
Inside a Cisco
network gateway
V
