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Sir its saying During switchover, system control and routing protocol execution is transferred from the active supervisor engine to the redundant supervisor engine. The switch requires between 0 and 3 seconds to switchover from the active to the redundant supervisor engine.
That means i can have downtime of max 3 seconds ?
BTW, that's under SSO. For L2 dataplane the same section notes "This type of switchover ensures that Layer 2 traffic is not interrupted."
If you read the next section, "NSF Operation", this features addresses L3 forwarding with little or no interruption. (BTW NSF stands for non-stop forwarding.)
So, in an ideal situation you'll have no data forwarding downtime (i.e. non-stop forwarding).
However, as noted in my first post, NSF deals with dataplane, other control plane functions may be interrupted.
