I've inherited a pair of CSS 11503 in a VIP Redundancy Master - Backup pair, and need to add a 16 port ethernet expansion card into each them.
These switches are of course in a production envoiroment.
Can somebody tell the the corret way in which I should go about this upgrade, if possible with no disruption to the customers service.
My thinking is to shutdown the Backup, install the card. Power it back up.
Shutdown the Master, install the card and power it back up.
This all sounds too simple and your input would be greatly appreciated.
The Master has a priority of 101 preempt
The Backup has no priority set and no preempt
Thanks in advanced
if you shutdown the active, there will be a few seconds delay before the backup takes over during which client will have connection issues.
I would suggest to change the priority of the backup to a value higher than the master before shutting down the master.
Like this, you get a smooth failover.