NETWORK - CISCO how to open a case #TAC

If you need to open a Cisco CASE hou need to:

1.) Logon here:

Support --> Contact Support --> Open New Case

Or using below link 

2.) Open a new case
3.) Insert Serial Number, click on search button and then Next

4.) Final next page you need to fullfill case required fields (like title, problem description, email contacts etc. etc.)