Ios Commands - Cisco 1941W Configuration Manual

IOS Commands

IOS Commands
Table 7
operation on a device's boot flash. The erase or write of an attribute on the boot flash can hold the CPU
for a few milliseconds to complete the operation. The CPU hold can result in a functional impact on
protocols or applications that are extremely time sensitive, for instance, Bidirectional Forwarding
Detection (BFD) or routing protocols which use finely tuned short timers. For example, OSPF with fast
hellos and short dead timers.
Table 7
Functionality Command Name
Write to NV write memory
memory.
Changing the config-register
configuration value
register value.
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
8
lists the Cisco IOS commands and features that can trigger an erase, write, or erase and write
Cisco IOS Commands
Description
This command
writes the device's
configuration in to
the Non-Volatile
RAM (NVRAM)
on the boot flash.
Use this command
in privileged
EXEC mode.
The router has a
16-bit
configuration
register in
NVRAM. Each bit
has value 1 (on or
set) or value 0 (off
or clear), and each
bit setting affects
the router
behavior upon the
next reload power
cycle. Use this
command in
Global
configuration
mode.
Chapter
Configuration
Example Impact
Router#write A BFD flap is triggered when one of the
memory following configuration elements are
activated or deactivated and configuration is
saved to memory:
(config)#warm-reboot
(config)#boot config
(config)#boot system
Router(config)# Potential enough to flap bfd.
config-register
0xvalue
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