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Updating Cisco IOS Router Software

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Updating Cisco IOS Router Software

Table Of Contents

Updating Cisco IOS Router Software

IOS Version Requirements

Checking IOS Software Image Memory Requirements

Locating and Downloading a New IOS Image


Updating Cisco IOS Router Software


This chapter explains how to update Cisco IOS router software to a version supported by the Cisco WAPMS. It explains how to check memory requirements for the new software version, find the software version on the Cisco web site, perform the software upgrade, and verify the routers are functioning properly after the upgrade.

IOS Version Requirements

Cisco routers must have IOS software image 12.3(1) or later installed, to implement ATM and Frame Relay interface support with Cisco WAPMS.

Checking IOS Software Image Memory Requirements

Before installing a new Cisco IOS software image on your router, check if your router meets the memory requirements for that image. You must check how much Dynamic RAM (DRAM) and Flash are installed in the router and what software image version is installed. To do this, issue the show version command on your router and look for the following lines:

Router# show version
...
System image file is "flash:c827v-y6-mz.121-1.XB"

CISCO C827-4V (MPC855T) processor (revision 0x502) with 15360K/1024K bytes of memory.
...
8192K bytes of processor board System flash (Read/Write)

Add the DRAM and Flash memory together to find the total memory installed. In this example, it is 16MB.

For more information, see the Cisco web site:

http://www.cisco.com

Locating and Downloading a New IOS Image

Follow the steps shown below to choose and download a new IOS software image for your Cisco router from the Cisco web site.


Step 1 Determine the IOS Feature Set that is currently running on your router.

Step 2 Locate a selection of new IOS software images that support the Service Assurance Agent (SAA) for ATM or Frame Relay interfaces.

Step 3 Select a new image for your router. In some cases you may be required to choose a different IOS Feature Set in order to obtain the features compatible with Cisco WAPMS.

Step 4 Verify your router meets the minimum RAM and Flash memory requirements for this new image.

Step 5 Download the selected image.

Step 6 Upgrade the image in your router.

Step 7 Verify that the router operates as it did before the upgrade.



Note You must have a Cisco Connection Online (CCO) account to access the relevant tools on the Cisco web site.