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JunosE 11.3.x Service Availability Configuration Guide
Verifications of Requirements
Upgrade Setup
112
Table 19: Router Response to Undesirable Events During the Upgrade
Phase (continued)
Event
Router Action
A line module
The line module is held down and prevented from rebooting until the
reloads.
service restoration phase is completed. The line module then undergoes
a cold reboot to the running (post-upgrade) release.
An IOA is
Hot swapping is disabled during the upgrade phase. The line module
hotswapped.
undergoes a cold reboot and hot swapping is reenabled when the service
restoration phase is completed,
An application that
This event can take place only before the issu start command is issued,
does not support
because that command disables CLI configuration commands. When
unified ISSU is
you issue the issu start command, after configuring such an application,
configured.
the command exits and generates an error message.
Because some time may have passed since unified ISSU verified the requirements for
the upgrade during the initialization phase, unified ISSU reverifies all the same conditions.
Unified ISSU also verifies that no CLI configuration sessions are open, that no scripts or
macros are running, and that any SNMP requests or CLI commands in progress complete
within 5 seconds.
If any of the required conditions are not met, the CLI either exits the command with an
error message or provides an informative message and prompts you to proceed or halt.
When all the conditions are met, the CLI prompts you to proceed. If you continue, then
you can subsequently halt the upgrade only by reloading the router. If you exit the
command, the router remains in the unified ISSU initialized state.
At this stage all the preconditions have been met. The unified ISSU process shuts down
all management interfaces to the router in order to prevent changes in the configuration.
Final preparation for the upgrade phase includes the following actions:
SNMP—The SNMP agent generates a juniSystemIssuStateChange trap with
juniSystemIssuState set to upgrading to indicate that the final phase of the operation
has begun. When the trap is issued with this state value, the SNMP agent stops
accepting any new SNMP gets or sets and does not issue any further traps.
CLI—Most CLI commands are disabled. Only reload, show issu, and show version
commands are available to you until the service restoration phase completes. These
commands are available on the console and are not available to Telnet sessions.
External events—Externally created events from sources other than the CLI are ignored.
These events typically come from user connections, RADIUS servers, SRC software
and SDX software, and SNMP, and include login requests, COA requests, multicast
Copyright © 2010, Juniper Networks, Inc.
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