Cisco Cisco Nexus 5010 Switch Installation Guide
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Cisco Nexus 5500 Series NX-OS Software Upgrade and Downgrade Guide, Release 7.0(8)N1(1)
In-Service Software Upgrades
In-Service Software Upgrades
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 that are connected to the Cisco
Nexus device access layer should see no traffic disruption.
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 that are connected to the Cisco
Nexus device access layer should see no traffic disruption.
ISSU and Layer 3
Cisco Nexus devices support Layer 3 functionality. However, the system cannot be upgraded with the
ISSU process (nondisruptive upgrade) when Layer 3 is enabled. You must unconfigure all Layer 3
features to be able to upgrade in a nondisruptive way with an ISSU. You must remove the Layer 3 license.
ISSU process (nondisruptive upgrade) when Layer 3 is enabled. You must unconfigure all Layer 3
features to be able to upgrade in a nondisruptive way with an ISSU. You must remove the Layer 3 license.
ISSU Supported Topologies
This section includes the following topics:
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Table 2
Upgrade/Downgrade Impact
Current Cisco NX-OS Release
Upgrade to NX-OS Release
7.0(8)N1(1)
7.0(8)N1(1)
Downgrade from NX-OS Release
7.0(8)N1(1)
7.0(8)N1(1)
7.0(7)N1(1)
7.0(6)N1(1)
7.0(5)N1(1a)
7.0(5)N1(1)
7.0(4)N1(1)
7.0(3)N1(1)
7.0(2)N1(1)
7.0(1)N1(1)
7.0(0)N1(1)
6.0(2)N2(7)
6.0(2)N2(6)
6.0(2)N2(5a)
6.0(2)N2(5)
6.0(2)N2(4)
6.0(2)N2(2)
5.2(1)N1(9)
5.2(1)N1(8b)
5.2(1)N1(8)
5.2(1)N1(7)
5.2(1)N1(6)
7.0(6)N1(1)
7.0(5)N1(1a)
7.0(5)N1(1)
7.0(4)N1(1)
7.0(3)N1(1)
7.0(2)N1(1)
7.0(1)N1(1)
7.0(0)N1(1)
6.0(2)N2(7)
6.0(2)N2(6)
6.0(2)N2(5a)
6.0(2)N2(5)
6.0(2)N2(4)
6.0(2)N2(2)
5.2(1)N1(9)
5.2(1)N1(8b)
5.2(1)N1(8)
5.2(1)N1(7)
5.2(1)N1(6)
Nondisruptive upgrade (ISSU)
Disruptive downgrade.