Log Messages Generated For Stateful Lm Switchover; State; Log Messages Displayed During The Transition From Active State To Pending Or Disabled State - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SERVICE AVAILABILITY CONFIGURATION GUIDE 2010-10-08 Configuration Manual

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Log Messages Generated for Stateful LM Switchover

Log Messages Displayed During the Transition from Disabled State to Active State

Log Messages Displayed During the Transition from Active State to Pending or Disabled State

Copyright © 2010, Juniper Networks, Inc.
The high availability operation on each line module is controlled by a state machine.
In this example, the line module in slot 10 takes over as the primary module.
Stateful Line Module Switchover Modes on page 83
Application Support for Stateful Line Module Switchover on page 79
mode
line-card switch
show redundancy history
show redundancy line-card
When you configure high availability for line modules and SRP modules, the modules
that support stateful switchover record log messages and SNMP traps when they
transition to different switchover states, such as disabled, initializing, and active.
In releases of JunosE Software that did not support high availability for line modules, the
logging messages for the ha event log category displayed information about high
availability functions that were specific to SRP switchover operations. Although the log
messages were associated with SRP switchover, the high availability details in the
recorded messages did not explicitly indicate that the information was relevant to only
SRP modules.
In JunosE releases that support high availability for line modules, the existing messages
for the ha log event category have been enhanced to uniquely distinguish the changes
to switchover states for line modules and SRP modules. The following examples describe
logging messages generated when SRP modules and line modules transition from one
state to the other during the switchover process.
In the disabled state, which is the default state for high availability mode, the router uses
redundancy mode for line modules (if a standby line module is configured for switchover
purposes). If all criteria are met for the system to shift from the disabled state to begin
bulk synchronization of the memory, high availability mode transitions to the initialization
state. After initialization is completed, the system enters the active state. The following
log messages are saved for SRP modules and line modules when the system moves from
the disabled state to the active state. You must configure the high availability log event
category using the logging severity ha command in Global Configuration mode to enable
logs related to high availability operations to be recorded.
NOTICE 03/08/2005 10:34:35 ha: High Availability on the SRP is now active
NOTICE 03/08/2005 10:34:35 ha: High Availability on Slots X, Y is now active
When an unsupported application is configured after HA is active on the line module, the
application is regarded as unsafe for HA. The state machine on the line module transitions
Chapter 4: Managing Stateful Line Module Switchover
91