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Software Configuration Guide—Release IOS XE 3.6.0SG and IOS 15.2(2)SG
OL-30933-01
Chapter 6 Configuring the Cisco IOS In-Service Software Upgrade Process
About ISSU
After a switchover (NSF or SSO, not RPR), the standby supervisor engine takes over as the new active
supervisor engine (see Figure 6-6).
Figure 6-6 Switch Over to Standby Supervisor Engine
Line cards
Old
Active
Supervisor
Engine
Cisco IOS
12.x(y)S
Cisco IOS
12.x(y)S
Cisco IOS
12.x(y)S
NSF/SSO
Switchover
NSF/SSO
Switchover
Run new version
of Cisco IOS
on standby
Cisco IOS
12.x(z)S
New
Active
Supervisor
Engine
180233
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