IOS Image Filenames

IOS is the software that resides inside the Cisco device. You can think of IOS as the kernel or the actual operating code within your router. The IOS image has a name, which specifies the platform for which the image was built, the features it includes, and where the image is located in memory. To see the name of the image your router is running, give the command show version:

Router>show version
Cisco Internetwork Operating System Software IOS (tm)
 3600 Software (C3640-JS-M), Version 12.0(5)T1, RELEASE SOFTWARE (fc1)

In this example, C3640-JS-M is the IOS image name. The name has three parts: platform identifier , feature set, and image execution location. In this example, C3640 is the platform identifier, JS is the feature set, and M is the image execution location.

2.1.1. Platform Identifier

The platform identifier indicates the hardware for which the image was built. Table 2-1 lists the most common platform identifiers. This list is quite extensive and grows as new products are released.

Table 2-1. Common platform identifiers

Identifier

Platforms

as

Access Server 5200 series

ca

Cisco Advantage

cpa

Cisco Pro

cs

Communication Server

c800, c1000, c1005, c1600

Cisco 800, 1003, 1004, 1005, 1600

c2500

Cisco 2500-2525 series routers

c2600

Cisco 2610-2613 series routers

c2800

Catalyst 2800

c2900

Cisco 2910, 2950

c29atm

Cisco 2900 ATM

c3620, c3640, c3800

Cisco 3620, 3640, 3800

c5200, c5300

Cisco AS5200, AS5300

c4000,c4500,c4700

Cisco 4000 series routers

c5fsfc

Catalyst 5000 series

c5rsm

Catalyst 5000 RSM

c5atm

Catalyst ATM

c6400s, c6400r

Cisco 6400 NSP, Cisco 6400 NRP

c6msm

Catalyst

c7000

Cisco 7000, 7010

c7200

Cisco 7200

Igs

IGS, 2500, 3000, and 5100 series routers

gs3

AGS and AGS+ gateway routers

gs7

7000 series gateway routers

Gsr

Gigabit Switch Router (12000)

ls1010

LightStream 1010

Mc3810

Multiservice Cisco 3810

Rpm

MGX 8850

RSP

Cisco 7500 series

 

2.1.2. Feature Set

The feature set describes the options that are included in the IOS image. Table 2-2 lists the most popular feature sets. Keep in mind that features are often tied to platformsany given platform supports only some feature sets. Also, note that the feature set indicators may be combined. For example, the IOS image C3640-JS-M has the feature set JS, which combines the Enterprise Subset feature set (J) with the Source Route Switch feature set (S).

Table 2-2. Common feature sets

Feature set

Contents

A

APPN

A2

ATM

B

AppleTalk

BOOT

Boot image

C

Remote Access Server

D

Desktop subset (SNMP, IP, BRIDGING, WAN, Terminal Services, IPX, ATALK, ARAP)

D2

Desktop Plus

Dsv

Desktop/IBM

EBOOT

Ethernet boot image for MC3810

F

FRAD subset

G

ISDN subset

G2

Gatekeeper proxy, voice and video

G3

ISDN subset for c800 (IP, ISDN, Frame Relay)

I

IP subset

I2

IP subset for 3600

I3

Reduced IP subset with BGP/EGP/NHRP removed

Is

IP Plus

Is56i

IP IPSec 56

J

Enterprise subset (protocol translation)

Js40

Enterprise 40

Jsv56

Enterprise IPSec 56

Js

Enterprise Plus

Js40

Enterprise Plus 40

Js56i

Enterprise Plus IPSec 56

K

Kitchen sink

K1

Privacy key encryption (11.3 and above)

K3

Triple DES (11.3 and above)

K4

168-bit encryption with SSH

L

IpeXchange IPX, static routing, gateway

M

RMON

N

IPX

O

Firewall

O2

Firewall (3xx0)

O3

Firewall with SSH (36x0, 26x0)

P

Service provider (IP RIP/IGRP/EIGRP/OSPF/BGP CLNS ISIS/IGRP)

R

RSRB (remote source route bridging); this option can be added to other feature sets

S

Source route switch (SNMP, IP, BRIDGING, SRB)

V

VIP and dual RSP support

V2

Voice V2D

V3

Voice feature card

X

X.25 (11.1 and earlier), and on 12.0T on c800 series

X

Frame Relay in 11.2

X

H.323 Gatekeeper/Proxy for 2500, 3620, 3640, MC3810

Y

Reduced IP (SNMP, IP RIP/IGRP/EIGRP, BRIDGING, ISDN, PPP), for low-end routers

Y2

IP variant (SNMP, IP RIP/IGRP/EIGRP, WAN -X.25, OSPF, PIM)

Y3

IP/X.31

Y4

Reduced IP variant (Cable, MIBs, DHCP, EZHTTP)

Y5

Reduced IP variant (Cable, MIBs, DHCP, EZIP) for home office

Y6

Reduced IP variant (c800)

 

2.1.3. Image Execution Location

The image execution location describes where the image is to be located in the router's memory. For example, given the image name C3640-JS-M, the M indicates that the image can be stored in RAM. Table 2-3 lists the most common execution locations. Keep in mind that some of these can be combined; for example, the location LZ indicates that the image is relocatable and has been compressed.

Table 2-3. Execution locations

Flag

Location

F

Flash

M

RAM

R

ROM

L

Relocatable

C

Flash card (PCMIA)

Z,X,W

Image is compressed


Getting Started

IOS Images and Configuration Files

Basic Router Configuration

Line Commands

Interface Commands

Networking Technologies

Access Lists

IP Routing Topics

Interior Routing Protocols

Border Gateway Protocol

Quality of Service

Dial-on-Demand Routing

Specialized Networking Topics

Switches and VLANs

Router Security

Troubleshooting and Logging

Quick Reference

Appendix A Network Basics

Index



Cisco IOS in a Nutshell
Cisco IOS in a Nutshell (In a Nutshell (OReilly))
ISBN: 0596008694
EAN: 2147483647
Year: 2006
Pages: 1031
Authors: James Boney

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