Cisco Cisco Nexus 5010 Switch Guida All'Installazione

After a successful power sequence upgrade, you must switch off the power to the system and 
then power it up.

Cisco NX-OS supports in-service software upgrades (ISSUs) that allow a Cisco Nexus device and any 
connected FEXs to be upgraded without any traffic disruption (with a brief control plane disruption). A 
few conditions have to be met for the system to be upgraded via an ISSU process—the access layer 
topology should be ISSU compliant, the current and target versions should be ISSU capable, and the 
network should be stable.

If the conditions required for ISSU are not met or if you intend to downgrade the software version, the 
installation process will be disruptive. For example, rebooting the Cisco Nexus device and any connected 
FEX causes a disruption. If Cisco’s virtual port channel (vPC) is configured on Cisco Nexus devices, it 
is possible to achieve an upgrade/downgrade with very minimal traffic disruption to servers/hosts.

Doing a disruptive upgrade between incompatible images will result in loss of certain configurations 
such as unified ports, breakout, and FEX configurations. See 

 for details.

The Cisco Nexus 5696Q cannot be downgraded from release 7.0(4)N1(1). The Cisco Nexus 56128 
cannot be downgraded from release 7.0(2)N1(1). The Cisco Nexus 5672 cannot be downgraded from 
release 7.0(1)N1(1).

With a single supervisor system, such as the Cisco Nexus device, an ISSU on the Cisco Nexus device 
causes the supervisor CPU to reset and load the new software version. The control plane is inactive, but 
the data plane keeps forwarding packets that lead to an upgrade with no service disruption. After the 
CPU loads the updated version of Cisco NX-OS, the system restores the control plane to a previously 
known configuration and the runtime state and the data plane are synchronized. Because the data plane 
keeps forwarding packets while the control plane is upgraded, any servers connected to the Cisco Nexus 
device access layer should see no traffic disruption.

7.0(5)N1(1a)
7.0(5)N1(1)
7.0(4)N1(1)
7.0(3)N1(1)

Nondisruptive upgrade 

Disruptive downgrade.