I have a MX84 cluster on my DC, as a VPN hub. It will be necessary to perform a forced upgrade of the two appliances and I would like to know if there is any "optimal" strategy to perform the upgrade of them.
I was thinking of undoing the Warm Spare, add the secondary MX in a temporary network, just for the upgrade, after updating it, it would be waiting to finish the update of the primary and then return the HA.
There is a possibility of having to reset the boxes, however, disregarding this, would this strategy be a good ideal?
" the dashboard will automatically take steps to minimize downtime when upgrades are performed to ensure a zero-downtime MX upgrade "
Will a tcp state table be copied across or will tcp connections be reset ?
My understanding ref @cmr 's comment, SIP phones - once call setup has taken place - will be keeping the call going between endpoints and unless the call flow, or one of the endpoints, is via the device being upgraded there is no impact. If the SIP server is via the device in q, I can see a hit, but I would have thought it would be very quick if 'zero downtime' is the reality.