Manual

Cisco IOS In Service Software Upgrade Process
Information About Performing ISSU
6
Cisco IOS Release 12.2(28)SB
An ISSU-capable router consists of two RPs (active and standby) and one or more line cards. Before
initiating the ISSU process, copy the Cisco IOS software into the file systems of both RPs (see Figure 2).
Figure 2 How to Load New Cisco IOS Software on Both RPs
Line cards
Active
Route
Processor
Cisco IOS
12.x(y)S
Cisco IOS
12.x(y)S
Cisco IOS
12.x(z)S
Cisco IOS
12.x(z)S
Cisco IOS
12.x(y)S
Install new version
of Cisco IOS
on active and standby RPs
Cisco IOS
12.x(y)S
Cisco IOS
12.x(z)S
Cisco IOS
12.x(z)S
Standby
Route
Processor
127258