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JunosE 11.3.x Service Availability Configuration Guide
SNMP Traps
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Unified ISSU Upgrade Phase Overview
110
If you configure an application that does not support unified ISSU during the initialization
phase, the initialization phase completes, but the issu start command subsequently fails.
When you issue the issu initialization command, the SNMP agent generates a
juniSystemIssuStateChange trap with juniSystemIssuState set to initializing. When the
unified ISSU initialization is completed, the SNMP agent generates a
juniSystemIssuStateChange trap with juniSystemIssuState set to initialized.
Unified ISSU Phases Overview on page 107
Halt of Unified ISSU During Initialization Phase Overview on page 142
Halting Unified ISSU During Initialization Phase on page 142
issu initialize
issu start
issu stop
show issu
During the upgrade phase, the CLI supports only a reduced set of administrative
commands. You cannot interrupt the upgrade phase. The upgrade phase cannot
commence if any CLI commands outside of this set are executing when you issue the
issu start command.
NOTE: Although you can use any CLI session to issue the issu start command,
we recommend that you issue the command from a session to the
management console port. When the standby SRP module switchover takes
place, all management network connections through the Ethernet
management port are dropped, and you can access the router only through
a console port until the service restoration phase is completed.
When you issue the issu start command, unified ISSU performs the following operations:
Verifies that the unified ISSU requirements on the router are still met.
1.
Verifies that the active and standby SRP modules are synchronized. If they are not
2.
synchronized, forces a synchronization to ensure that all configuration and file system
changes are propagated to the standby SRP module before proceeding with the
upgrade.
Copies the NVS configuration from a backup memory area to the flash card on the
3.
standby SRP module. During the initialization phase, this configuration data was
mirrored from NVS on the active SRP module and upgraded as required by the armed
release.
Upgrades the control plane on each line module at the same time.
4.
Copyright © 2010, Juniper Networks, Inc.
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