5-9
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 5 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 5-6).
Figure 5-6 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
To Next Page
Loading...
