1. Cisco S2 C7 Router Operation System IOS

2. Routers Boot From Flash memory TFTP server ROM (not full Cisco IOS software) –Default depends on platform –Order can be programmed by user

3. Boot Sequence Boot system Flash IOS_filename Boot system TFTP IOS_filename tftp address Boot system ROM IOS_filename

4. Register Values 0x..0Use ROM (boot manually – use b command) 0x…1Automatically boot from ROM (is default if router has no flash) 0x…2 to 0x…F –Examine NVRAM –Default if router has Flash memory Use config-register in global configuration to change the default setting Use show version command to verify config- register command

5. Show Version Screen Display System image file is "c4500-f-mz", booted via tftp from 171.69.1.129 Also displays information about the type of platform on which the version of Cisco IOS software is currently running Displays information about the Cisco IOS software version that is currently running Shows configuration register and the boot field setting

6. Bootstrap Options Router #configure terminal Router (config) # boot system flash gsnew- image –Ctrl+Z Router #

7. TFTP Router #ping tftp – address –Sending 5, 100-byte ICMP echoes to IP add –Timeout is __ seconds !!!.! –Success rate is 80% (4/5) –Round trip min/avg/max = 45/54/160 ns Show flash Shows free flash memory Ls List of directories and file names used on tftp server

8. Show Flash Verifies sufficient memory to load IOS Displays –Amount of flash memory –Amount of free memory –Status Should backup IOS image for each router

9. Cisco Naming Conventions Namehw platform featuresRun location Cpa25-cg-1 2500 Remote Accreloc Igs-inr-1 25xx IP subset IPX reloc Naming convention has three parts –Platform, letter or series of letters, where image runs and if it is compressed or zipped

10. Copy Flash provide a fallback copy of the current image prior to updating the image with a new version erase routine is usually required before new files can be copied. Each exclamation point (!) means that one User Datagram Protocol (UDP) segment has successfully transferred

11. Copy tftp flash Used to load backup IOS version System will prompt for IP address of tftp server System will prompt for file name of image File with same same in flash will be deleted when you copy –DELETED files listed with deleted tag when you use show flash command