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Posted by HamidAliKhan

https://hypersonic.bluecoat.com/packetguide/7.2.0/solutions/compression/accelerate-traffic

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Posted by crouse

Compression Identifier:

The compression identifiers basically shows that what type of compression is used on the image.

RUN Location:

Run location indicates both its execution area and, when applicable, the compression identifiers.

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Posted by sagitraz

The run location indicates both its execution area and, when applicable, the compression identifiers. Table illustrates the common run locations.

Code | Location
F | Image runs in flash
M | Image runs in Random Access Memory (RAM)
R | Image runs in Read Only Memory (ROM)
L | Image will be relocated at runtime

The compression identifiers indicate what type of compression is used on the image. Common compression identifiers are shown in Table.

Code | Compression
Z | Image is Zip compressed
X | Image is Mzip compressed
W | Image is Stac compressed

For example, image c7200-js-mz is an IOS for the 7200 series router, with enterprise plus software, executed in RAM, and is Mzip compressed.

You can view the IOS files you have stored in flash memory by executing the command show flash. This command can be executed from either user EXEC or privileged EXEC mode. Following is the output of the show flash command on a 1604 router:

Router>show flash
PCMCIA flash directory:
File Length Name/status
1 6611048 /c1600-nosy-l.120-25.bin
[6611112 bytes used, 1777496 available, 8388608 total]
8192K bytes of processor board PCMCIA flash (Read ONLY)

In this instance, there is only one IOS in flash. Taking the filename, c1600-nosy-l.120-25.bin, you can see that the platform is a 1600 series router with a feature set of 'nosy' (the 1600 designation for IP/IPX/FW Plus) and is relocated at runtime but not compressed. The IOS version is 12.0(25).

Although the show flash command will show you all IOS files that you have in flash, it will not show you the IOS that you are currently using if you have more than one IOS. To view the IOS that you are currently using on your router, execute the command show version. Like the show flash command, the show version command may be executed from user EXEC or privileged EXEC. Following is the output of the show version command with the relevant portions in bold text.

Code View:
Router>show version
Cisco Internetwork Operating System Software
IOS (tm) 1600 Software (C1600-NOSY-L), Version 12.0(25), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Tue 31-Dec-02 12:29 by srani
Image text-base: 0x080357F8, data-base: 0x02005000

ROM: System Bootstrap, Version 11.1(10)AA, EARLY DEPLOYMENT RELEASE SOFTWARE
(fc1)
ROM: 1600 Software (C1600-BOOT-R), Version 11.1(10)AA, EARLY DEPLOYMENT RELEASE
SOFTWARE (fc1)

Router uptime is 6 minutes
System restarted by power-on
System image file is "flash:/c1600-nosy-l.120-25.bin"

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Posted by ambrose