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Cisco Nexus 7000 Series—In-Service Software Upgrade (ISSU)

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In a Nexus 7000 series chassis with dual supervisors, you can use the in-service software upgrade (ISSU) feature to upgrade the system software while the system continues to forward traffic. An ISSU uses the existing features of nonstop forwarding (NSF) with stateful switchover (SSO) to perform the software upgrade with no system downtime.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/high_availability/configuration/guide/ha_issu.html.

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