I am planning to upgrade my 5510 ASA pair as described in the subject. I am hoping to use the procedure at this petenetlive URL..
A few concerns.
Will upgrading from 8.21 to 8.47 and then 8.47 to 9.14 be a good sequence?
Is there any risk to the functionality of my CIsco Proxy phones? I have about 20 deployed around the country and I am concerned that the upgrade could leave some sales reps without phone service if there's an incompatibility. Any issues to consider there??
Is there any risk to a VPN tunnel to another ASA 5510 pair which is still using 8.21? That would likewise be very bad
if after the upgrade I could no longer get to the remote site. Anything need to be reconfigured on either side after the upgrades?