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.
|
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).
|
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.
|
Flag |
Location |
|---|---|
|
F |
Flash |
|
M |
RAM |
|
R |
ROM |
|
L |
Relocatable |
|
C |
Flash card (PCMIA) |
|
Z,X,W |
Image is compressed |