We recently ran into bug CSCus64795 on one of our Cisco 6509 pairs (Excessive logging/Memory leak due to a parity error in the Netflow VRAM) and forced switchover to the secondary VSS unit. Please would someone advise how long a VSS switchover usually takes and how long the expected outage is for connected networks?
This should help-
This document focuses on supervisor fail-over and not the VSS system. However, If I'm reading this correctly, the brief mention of VSS states that the fail-over time is typically less than 200 milliseconds.