1. CIT 384: Network Administration
Router Configuration
CIT 384: Network Administration

2. CIT 384: Network Administration
Topics
Cisco 2960
IOS CLI Differences
IOS Upgrades
Booting
CIT 384: Network Administration

3. Routing at Network Layer
Forwards IP frames between two networks.
A router is a specialized computer dedicated to routing.
Router OS
Cisco IOS
Juniper JUNOS
Linux
Application
Presentation
Session
Transport
Network
Data Link
Physical
CIT 384: Network Administration

4. CIT 384: Network Administration
Cisco 2960 Router
Two 10/100 Mbps Ethernet ports
Supports variety of modules
WAN interfaces
VoIP
Wireless
CIT 384: Network Administration

5. CIT 384: Network Administration
Accessing the IOS CLI
Serial console.
AUX port modem
Network: telnet
Network: ssh
CIT 384: Network Administration

6. CIT 384: Network Administration
IOS CLI Differences
Configuration of IP addresses.
Setup mode questions.
Routing table.
Routing protocols.
CIT 384: Network Administration

7. CIT 384: Network Administration
Router Modes
CIT 384: Network Administration

8. CIT 384: Network Administration
IOS Upgrade Process
CIT 384: Network Administration

9. CIT 384: Network Administration
IOS Upgrade Procedure
R1#copy tftp flash c
System flash directory:
File Length Name/status
c4500-d-mz bin
[ bytes used, available, total]
Address or name of remote host [ ]?
Source file name? c4500-d-mz bin
Destination file name [c4500-d-mz bin]?
Accessing file c4500-d-mz bin on
Loading c4500-d-mz bin from (via Ethernet0): ! [OK]
Erase flash device before writing? [confirm]
Flash contains files. Are you sure you want to erase? [confirm]
Copy 'c4500-d-mz bin ' from server y
as 'c4500-d-mz bin ' into Flash WITH erase? [yes/no]y
Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ...erased
Loading c4500-d-mz bin from (via Ethernet0):
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! (leaving out lots of exclamation points)
[OK / bytes]
Verifying checksum... OK (0xA93E)
Flash copy took 0:04:26 [hh:mm:ss]
CIT 384: Network Administration

10. CIT 384: Network Administration
IOS Boot Sequence
CIT 384: Network Administration

11. CIT 384: Network Administration
Starting IOS
CIT 384: Network Administration

12. CIT 384: Network Administration
boot system
Router uses boot system commands in NVRAM to locate IOS.
Router#
configure terminal
Router(config)#
boot system flash c2800k9_42-18.bin
boot system tftp c bin
boot system rom
exit
copy running-config startup-config
After a reload, router will try these in the order they were entered.
CIT 384: Network Administration

13. CIT 384: Network Administration
IOS Image Naming
Platform
Feature Set
File Format
(RAM Compressed)
flash:c2800nm-advsecurityk9-mz b.bin
Version (12.4)
Patch Level
Encryption (3DES)
Location of Image
CIT 384: Network Administration

14. IOS Feature Set Inheritance
Image from IOS in a Nutshell, 2nd ed
CIT 384: Network Administration

15. Configuration Register
Bit Number
Hex
Meaning
00-03 F
Boot parameter
0000: stay at boot prompt
0001: boot IOS from ROM
F: normal boot sequence 06
0040
Ignore NVRAM contents 07
0080
Disable boot messages 08
0100
Break disabled 10
0400
IP broadcast will all zeros
5,11,12
0020,0800,1000
Console line speed 13
2000
Boot default ROM if net boot fails 14
4000
IP broadcasts don’t have net numbers 15
8000
Enables diagnostics; ignores NVRAM
CIT 384: Network Administration

16. Common Register Settings
Configuration Register
Router Behavior
0x2102
Boot into ROM if boot fails.
Ignores break.
9600 bps console speed
0x2142
Boots into ROM if boot fails.
Ignores NVRAM configuration.
0x3122
57600 bps console speed.
CIT 384: Network Administration

17. CIT 384: Network Administration
References
James Boney, Cisco IOS in a Nutshell, 2nd edition, O’Reilly, 2005.
Cisco, Cisco Connection Documentation,
Cisco, Internetworking Basics,
Wendell Odom, CCNA Official Exam Certification Library, 3rd edition, Cisco Press, 2007.
CIT 384: Network Administration