Issu Using The Four Command Sequence: Step 3 (Acceptversion) - Cisco Catalyst 4500 series Administration Manual

In-Service Software Upgrade (ISSU) on a VSS
Redundancy Mode (Operational) = Stateful Switchover
Redundancy Mode (Configured) = Stateful Switchover
Communications = Up
client_notification_TMR = 240000 milliseconds
Once Runversion has completed, the new active supervisor engine will be running the new version of
software and the previously active supervisor engine will now become the standby supervisor engine.
The standby supervisor engine will be reset and reloaded, but it will remain on the previous version of
software and come back online in Standby hot status.
Use the show redundancy, show redundancy states, and show issu state [detailed] commands
described previously to verify that the standby supervisor engine is running the pre-upgrade version and
that the Active is running the post-upgrade version.

ISSU using the Four Command Sequence: Step 3 (acceptversion)

This step is optional. It is needed only if you wish to stop the ISSU rollback timer. Otherwise you may
proceed to the next step (commitversion)
Cisco IOS XE software maintains an ISSU rollback timer to safeguard against an upgrade that may leave
the new active supervisor engine in a state in which communication with the standby supervisor engine
is severed. By default, this duration is 45 minutes. If the commitversion command is not applied before
the rollback timer duration expires, the VSS reverts to the pre-upgrade version.
The acceptversion command stops the rollback timer. This means that you can maintain the system in
the current state (runversion, with the post-upgrade version running on the active supervisor engine, and
pre-upgrade image running on the standby supervisor engine) for an extended duration, and proceed to
the commitversion state only when you are satisfied with the behavior of the post-upgrade software
version.
This optional task describes how to stop the rollback timer.
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
5-70
Unit ID = 11
Redundancy State = Stateful Switchover
Manual Swact = enabled
client count = 474
keep_alive TMR = 9000 milliseconds
keep_alive count = 0
keep_alive threshold = 18
RF debug mask = 0
Chapter 5 Configuring Virtual Switching Systems
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