Hi akg7,
I know you have already clarified this, however I recently opened a case with TAC in order to validate the ISSU upgrade described in this post and they stated that ISSU is not recommended since it has caused issues (infinite reboot on the slave member after switchover command, this is caused by an incompatible fimrware detection). I requested an official statement however they said their email could be used as one. Do you know of any restriction on using ISSU internally? As per the L2 engineer the recommendation of not using ISSU was given by an L3 engineer.