H3C Technologies H3C S12500 Series Switches - Manual (Page 143)

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ISSU upgrade steps and states
During the ISSU upgrade process, the switch might be in one of the states shown in Table 16 .
Table 16 ISSU state description
State Description
Init No ISSU states or an ISSU upgrade has completed.
Load
The standby MPU or a member switch is being upgraded or has been
upgraded. The rollback timer is created successfully and runs correctly.
Switching Interface cards are being upgraded or the system is performing a rollback.
Switchover
Interface cards have been upgraded, and the upgraded standby MPU or
member switch has become the new active MPU or master.
Accept
The upgrading operation of the new active MPU or the new master is accepted,
and the rollback timer is automatically deleted. No auto-rollback is performed
during this ISSU upgrade process.
Commit (the state of the
standby MPU)
Multiple standby MPUs or member switches are available in the system, and at
least one standby MPU or member switch has not upgraded to the new version.
In this state, neither manual nor auto-rollback is performed during this ISSU
upgrade process.
ISSU states correspond to ISSU operations. The ISSU state changes and operations during the upgrade
process might vary depending on the software version compatibility state between the upgrade and the
current version. See Figure 44 , Figure 45 , Figure 46 , and Figure 47 .
The ISSU upgrade process proceeds step by step, and each operation corresponds to an ISSU state.
Except for the state change caused by expiration of the rollback timer, the ISSU state changes only when
you execute the corresponding command. For example, in Figure 44 , "Upgrade the global standby
MPU", "Switchover & upgrade interface cards", "Accept the upgrade of the new global active MPU",
and "Upgrade another MPU" are the ISSU operations, and are completed by executing the issu load,
issu run switchover, issu accept, and issu commit commands respectively. Rollback is also an ISSU
operation, which can be triggered by either the expiration of the rollback timer or the execution of the
issu rollback command.
The arrows in the figures indicate the directions of state changes. For example, if you execute the issu
load command on the switch in the init state, the local standby MPU of the master upgrades to the new
version and its ISSU state changes to load. If you execute the issu rollback command on the IRF member
switch in load state, the local standby MPU of the master rolls back to the previous version and the ISSU
state changes back to init.