When would you use an ISSU upgrade process?

seenagapeJuly 8, 2015

A.
The AMB and SMB on an A8800 router are running different versions ofsoftware.

B.
An A6600 router is operating in load-balance mode.

C.
An A5820 switch is part of an IRF virtual device.

D.
An A7500 switch is operating in standalone mode.

Explanation:

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