Managing Cisco IOS Software
From Mycomputer Notes
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==Locating and loading the IOS == | ==Locating and loading the IOS == | ||
| - | + | Cisco IOS software image from: | |
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*'''Flash memory''' - A system image can be loaded from flash memory. Information stored in flash memory is not vulnerable to network failures that can occur when system images are loaded from TFTP servers. | *'''Flash memory''' - A system image can be loaded from flash memory. Information stored in flash memory is not vulnerable to network failures that can occur when system images are loaded from TFTP servers. | ||
*'''Network server''' - If flash memory is corrupted, a system image can be loaded from a TFTP server. | *'''Network server''' - If flash memory is corrupted, a system image can be loaded from a TFTP server. | ||
*'''ROM''' - The final bootstrap option is to boot from ROM. However, a system image in ROM is usually a subset of the Cisco IOS that lacks the protocols, features, and configurations of the full Cisco IOS. Also, if the software has been updated, a router may have an older version stored in ROM | *'''ROM''' - The final bootstrap option is to boot from ROM. However, a system image in ROM is usually a subset of the Cisco IOS that lacks the protocols, features, and configurations of the full Cisco IOS. Also, if the software has been updated, a router may have an older version stored in ROM | ||
Revision as of 21:45, 8 May 2006
A Cisco router cannot operate without the Cisco IOS. Each Cisco router has a predetermined bootup sequence for locating and laoding the IOS. The startup routines main purpose is to startup the router operations in a relaible manner. To accomplish this the router must:
- Test the router's hardware.
- Find and load the Cisco IOS Software.
- Find and apply configuration statements such as protocol functions and interface addresses.
Locating and loading the IOS
Cisco IOS software image from:
- Flash memory - A system image can be loaded from flash memory. Information stored in flash memory is not vulnerable to network failures that can occur when system images are loaded from TFTP servers.
- Network server - If flash memory is corrupted, a system image can be loaded from a TFTP server.
- ROM - The final bootstrap option is to boot from ROM. However, a system image in ROM is usually a subset of the Cisco IOS that lacks the protocols, features, and configurations of the full Cisco IOS. Also, if the software has been updated, a router may have an older version stored in ROM
