Need help on redirection

May be HTTP::host will help.

Pseudocode

if http host equals oli2
redirect http://oli2.bcbsnj.com 

Assuming that you've solved the DNS part, and the fully-qualified domain names are really oli2 and oli2.bcbsnj.com, then, via an iRule:

when HTTP_REQUEST {
    if { [string tolower [HTTP::host]] eq "oli2" } {
        HTTP::respond 301 Location "http://oli2.bcbsnj.com"
    }
}

If you only wish to redirect when the request is specifically for "/":

when HTTP_REQUEST {
    if { [HTTP::path] eq "/" and [string tolower [HTTP::host]] eq "oli2" } {
        HTTP::respond 301 Location "http://oli2.bcbsnj.com/"
    }
}

If you are using 11.4 or higher, you may also use a Local Traffic Policy:

• SOL15085: Overview of the Local Traffic Policies feature