I have successfully upgraded both 6509's, but the mentioned â0 to 3 seconds switchover timeâ (SSO mode) in the âCatalyst 6000/6500 Series Switches with Redundant Supervisor Engines Software Image Upgrade Configuration Exampleâ was a little bit underestimated.
I experienced longer switchover due to a reset of all cards (exept the SUP720). This was a bit unexpected. Can you give any reason for this?
And will this happen again in a future upgrade?
We also wonder if the card rebooted at the same time or one per one?
Someone has a document who explained that?