3.Licensing the BIG-IP System:--

After the configuring the management ip address,it needs to be licensed.This requires a base registration key of 27-character long string stored in a the  /config/regKey.license file,which uniquely identifies the device.

The registration key is presented in the following format
AAAAA-BBBBB-CCCCC-DDDDD-EEEEEEE

The BIG_IP system uses the base registration key to generate what is known as a dossier,which is what is actually passed to the F5's license server.The dosssier contains numerous encrypted characters that uniquely identify your system.Multiple options are stored in the dossier including registration key and the system time.

we have two ways do license in BIG-IP System

1.Automatic License Activation
2.Manual License Activation

 1.Automatic License Activation:--
The BIG-IP device needs internet access to reach the F5 licensing servers.

2.Manual License Activation:--
This method is used twhen the BIG-IP device does not have direct access to the internet.

Displaying the registration key from the command line

BIG-IP 11.0.0 and later

1. Log in to the BIG-IP command line.
2. To display the registration key, type the following command:
   tmsh show sys license
   The Sys::License section of the command output appears similar to the following example:
   Sys::License
   Licensed Version 11.0.0
   Registration key J1744-76883-90149-96395-1680471
   Licensed On 2016/02/07
   License Start Date 2016/02/06
   License End Date 2016/09/17
   Service Check Date 2016/08/18
   Platform ID D106
   Appliance Serial Number XX-ABCD-0112
   

Displaying the registration key in the Configuration utility

1. Log in to the Configuration utility.
2. Navigate to System > License.
3. Click Re-activate.
4. After the license activation page loads, locate the Base Registration Key.