IOS Feature Sets

Unanswered Question
Dec 18th, 2008
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Is there a list that shows what all the feature set codes are

ie in (C2500-JS-L)

J stands for "Enterprise" and S stands for "Plus"

Is there a list that shows all of these.

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marikakis Thu, 12/18/2008 - 03:11
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This type of information is not very easily found in one place. The best I could find are the following product bulletins:

The first bulletin includes new and older naming conventions.

Kind Regards,


Jose Montes Fri, 12/19/2008 - 12:57
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Hi, I hope this can help you.

I use the following summary for reference:

IOS names follow the format PPPP-FFFF-MM,

where P = platform, F = feature set, and MM = memory location (exectution area and compression).

In your example: C2500-JS-L, as you said JS, is Enterprise Plus but the L means Image will be relocated at run time

Feature Set Description


S Plus features NAT, ISL, VPDN


J Enterprise

JS Enterprise Plus

JK8S Enterprise Plus with IPSec

D Desktop

Memory location

F Image runs in Flash

m Image runs in RAM

R Image runs in ROM

L Image will be relocated at run time


Z Image is Zip compressed

x Image is Mzip compressed

w Image is "Stac" compressed


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