Cisco Cisco NAC Appliance 4.9.3

The following steps summarize how to perform new CD software installation of Release 4.9(3) on 
supported Cisco NAC Appliance hardware platforms (see 

 for additional support details).

If you are installing NAC Appliance image on NAC-3415/3495 shipped with new series of Seagate Hard 
Disk Drives, then make sure that you are using the latest NAC installer image, that is 
nac-4.9_3-K9-A6.iso. To ensure that you are using the latest image, enter the following command in 
CAM console: 

In the output that is displayed, check that the build tag is as follows: 

See Also 

.

You need to follow the above procedure not only for the new set of Seagate Hard Disk Drives, but also 
for the replacement appliances. Install the latest image when you do an RMA and obtain 
NAC-3415/3495 appliance shipped with Seagate Hard Disk Drives as replacement.

To upgrade on an existing Cisco NAC Appliance, refer to the instructions in 

. 

The click in the NAC is configured with default settings like default priority, CPU usage etc. The driver 
loop of the click thread uses the full CPU whenever other processes are idle. The CPU usage of click can 
reach 99%. As the thread runs with default priority, other processes like tomcat can take over whenever 
requests come for them. The high CPU usage of click will not lead to any performance issues.

With Release 4.9(3), installation occurs in two phases: 

The software is installed from the CD, and when complete, the CD is ejected from the appliance.

The admin logs in and performs the initial configuration.

If you are going to perform a new installation but are running a previous version of Cisco NAC 
Appliance, Cisco recommends backing up your current Clean Access Manager installation and saving 
the snapshot on your local computer, as described in 

.

Follow the instructions on your welcome letter to obtain product license files for your installation. See 

 for details. (If you are evaluating Cisco Clean Access, visit 

 to obtain an evaluation license.) 

Install the latest version of Release 4.9(3) on each Clean Access Server and Clean Access Manager, as 
follows:

Log in to the Cisco Software Download Site at 

You will likely be required to provide your CCO credentials.

Navigate to Security> Access Control and Policy> Network Admission Control > Cisco NAC 
Appliance (Clean Access) > Cisco NAC Appliance 4.9.