My question is, if a Go Daddy intermediate certificate bundle is already present on our LTM (expiry date not linked to the expiry date for the certificate assigned to go.test.com) , is there any need to replace the existing Go Daddy intermediate certificate bundle with the contents of the new gd_bundle.crt certificate?sometime CA changes their intermediate certificate, so i think it had better check whether it is a new intermediate certificate or not. if not, you do not need to change your existing one.
Via the LTM GUI select Local Traffic -> SSL Certificates -> go.test.com certificate -> Import -> Paste Text (paste the new certificate between BEGIN and END markers) -> Importyes
just in case you have not yet seen this sol.
sol10561: The BIG-IP system may not use a renewed SSL certificate
http://support.f5.com/kb/en-us/solutions/public/10000/500/sol10561.html?sr=18764241