Jun 10, 2015
IOS Images
Naming Convention
MM
2nd M
Sample
120.10 Version 12 10th Maintenance Revision
Platform
Features
Mm= Ram with zip
Image Selection has to match-up
RAM, FLASH, DRAM
Show Version
Key 3
Show Version
Show Flash
Check with 2 show commands
TFTP Server
Free from CISCO
Freeware from Klever
TFTP Server
Download PathCreate File C:/TFTP
Copy
Copy
OLD STYLE Change Address
OLD Style
Configuration Register
Click enter
IP AddressIOS File + .BIN
Loading
Source filename c3640-ds-mz.120-10.bin
Asked to Grant Acess
Will give file not valid executable say no to abort
Erase Flash - Yes
Yes
Confirm - enter
enter
Starts loading
Error wrong file
Wrong Router IOS boot
ROM not Corruptible –RAM - yes
ROM MONITOR - Like Safe Mode
ROM CHIP – Can’t Change
Can’t Corrupt
RAM
High end routers exception –Flash Memory
Boot Image Hung – Wrong router-Move to privileged Exec mode
Copy TFTP Flash
Add IP -192.168.1.254
2500 Router selected
Select Proper Filename - Confirm
Will connect to TFTP Server
Erase Flash – Old File - Confirm
Confirm – will erase old copy new
Same process – erase then copy
Can Actually have two files that coexist
Contents + Length = Checksum
Checks sum cisco = sum from new copy
Runs through Copy then checks - Checksum
After completion reload router
reload
2500 comes up
Checks Flash first
Boot second
VS 12 Valid software
Continues loading IOS
Boot from Flash
Show running config
Remembers correct filename
Now knows filename
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