Step 2. Obtain a license.

The next step is to obtain the license, which is actually a license file. A license file, also known as a Software Activation License, is obtained using one of the following options:

Both of these processes require a PAK number and a Unique Device Identifier (UDI).

The PAK is received during purchase.

The UDI is a combination of the Product ID (PID), the Serial Number (SN), and the hardware version. The SN is an 11 digit number which uniquely identifies a device. The PID identifies the type of device. Only the PID and SN are used for license creation. This UDI can be displayed using the show license udi command shown in Figure 1. This information is also available on a pull-out label tray found on the device. Figure 2 shows an example of the pull-out label on a Cisco 1941 router.

After entering the appropriate information, the customer receives an email containing the license information to install the license file. The license file is an XML text file with a .lic extension.

Use the Syntax Checker in Figure 3 to determine the UDI on router R2.