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Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
OL-30933-01
Chapter 5 Configuring Virtual Switching Systems
In-Service Software Upgrade (ISSU) on a VSS
Figure 5-9 Upgrading VSS System
Active
(version X)
VSL
Standby
(version X)
Active
(version X)
VSL
(Reboot)
Active
(version X)
VSL
Statefull Switchover
Standby
(version Y)
(Reboot)
VSL
Active
(version Y)
Standby
(version X)
VSL
Active
(version Y)
(Reboot)
VSL
Active
(version Y)
Standby
(version Y)
VSL
Active
(version Y)
345707
Note that at any given instant, at least one of the switches is Active. The Active
switch is in operation, i.e. continues to forward traffic and participate in network
control protocols throughout the duration of the upgrade operation.
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