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Chapter 6

ECE495 Chapter Notes - Chapter 6: List Of Ios Devices, Network Layer, Keepalive


Department
Electrical and Computer Engineering
Course Code
ECE495
Professor
mint
Chapter
6

This preview shows pages 1-3. to view the full 16 pages of the document.
The Cisco IOS v1.22 – Aaron Balchunas
* * *
All original material copyright © 2007 by
Aaron Balchunas (aaron@routeralley.com),
unless otherwise noted. All other material copyright © of their respective owners.
This material may be copied and used freely, but may not be altered or sold without the expressed written
consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
1
- The Cisco IOS -
Cisco IOS
The Cisco IOS (Internetwork Operating System) is a command-line
interface used by nearly all current Cisco routers and Catalyst switches. The
IOS provides the mechanism to configure all Layer 2 and Layer 3 functions
on Cisco devices.
The IOS is structured into several modes, which contain sets of commands
specific to the function of that mode. Access to a specific mode (and specific
commands) is governed by privilege levels. (Both modes and privilege
levels are covered in great detail in this guide).
The following is a representation of the IOS command-line interface, with
an example command:
Router# show startup-config
All commands throughout all guides on this site will be represented like the
above. The following is an explanation of each component of the above
command:
Router # show startup-config
Hostname Mode Command Argument
Hitting the “enter” key after a command will usually yield output specific to
your command:
Router# show startup-config
!
version 12.2
service timestamps log uptime
service password-encryption
!
hostname Router
!
<snip>
(Note: The above output was truncated to save space.)

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

The Cisco IOS v1.22 – Aaron Balchunas
* * *
All original material copyright © 2007 by
Aaron Balchunas (aaron@routeralley.com),
unless otherwise noted. All other material copyright © of their respective owners.
This material may be copied and used freely, but may not be altered or sold without the expressed written
consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
2
IOS Version Numbers
IOS version numbers are formatted as follows:
x.y(z)t
The "x" designates a major revision number.
The "y" designates a minor revision number.
The "z" designates an individual release number
The “t” designates a train identifier.
Thus, the third release of IOS version 12.4 would be identified as 12.4(3).
The major and minor revision numbers combined is often called the
Maintenance Release number (for example, “12.4”).
Trains identify IOS releases to specific markets, and are represented by a
single letter:
The “T” or Technology train is continuously updated with new
features and security fixes.
The “E” or Enterprise train contains features and commands for
enterprise-level equipment.
The “S” or Service Provider train contains features and a
command-set for specific ISP equipment
The absence of a train identifier denotes a Mainline release. Security
updates are released for the mainline train, but new functionality is never
added to the feature set.
The latest version of the IOS (as of this writing) is 12.4(11)T. To view the
IOS version of your Cisco device:
Router# show version
The Cisco IOS is stored in Flash on Cisco routers and Catalyst switches, in
a .BIN file format. It can be upgraded using one of several methods:
Replacing the existing Flash stick
Via a TFTP server
Via Xmodem
Via a PCMCIA slot (not supported by all Cisco devices)
(Reference: http://en.wikipedia.org/wiki/Cisco_IOS)

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

The Cisco IOS v1.22 – Aaron Balchunas
* * *
All original material copyright © 2007 by
Aaron Balchunas (aaron@routeralley.com),
unless otherwise noted. All other material copyright © of their respective owners.
This material may be copied and used freely, but may not be altered or sold without the expressed written
consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
3
IOS Version Numbers (continued)
The IOS .bin file stored in flash follows a specific naming convention.
Observe the following IOS image:
c2600-ik9s-mz.121-3.T.bin
The following is an explanation of each component of the above file name:
C2600 ik9s m z 121 3 T
Cisco
Hardware
Feature
Set
Memory
Location
Compression
Format
Maintenance
Release #
Individual
Release #
Train
Identifier
(Reference: http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_white_paper09186a008018305e.shtml)
The IOS supports a wide variety of feature sets. The following is a list of
common feature sets (and is by no means comprehensive):
is
ipbase
ipvoice
advsecurityk9
advipservicesk9
ik9s
jk9s
io3
bin
(Reference: http://www.cisco.com/en/US/products/hw/routers/ps259/prod_bulletin09186a0080161082.html)
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