Line Module Redundancy; Unified Issu; Replacement Of Line Modules When Stateful Line Module Switchover Is; Enabled - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SERVICE AVAILABILITY CONFIGURATION GUIDE 2010-10-08 Configuration Manual

Line Module Redundancy

Unified ISSU

Related
Documentation
Replacement of Line Modules When Stateful Line Module Switchover Is Enabled

Reloading the Primary Line Module in Response to Failures

Copyright © 2010, Juniper Networks, Inc.
communication is reestablished. Otherwise, the Ethernet switch on the standby SRP
module that has become active learns the MAC addresses in standby mode without
interrupting the IC-IC communication.
Line module redundancy and line module high availability are mutually exclusive features.
You cannot configure the line modules in a redundancy group to operate in HA mode.
Because both the mechanisms are mutually exclusive, if a module is a member of a
redundancy group, warm switchover is not supported. Similarly, if line modules are
configured in a high availability pair, they cannot be members of a redundancy group and
the spare module does not take over as the primary.
Unified ISSU can continue, if the configured secondary line module takes over as the
primary line module. The secondary line module is disabled during the upgrade phase of
the unified ISSU operation and cold boots after the unified ISSU operation is complete.
The disabled line module during unified ISSU is cold booted after the unified ISSU
operation is complete. Only the primary line module can participate in a unified ISSU
operation.
Replacement of Line Modules When Stateful Line Module Switchover Is Enabled on
page 77
Application Support for Stateful Line Module Switchover on page 79
Stateful Line Module Switchover Modes on page 83
Stateful Line Module Switchover States on page 84
slot erase
slot disable
reload slot
You can use the show version command to view the status of the SRP modules and line
modules, as well as the running and armed releases. The state field in the output of this
command indicates whether the slot that contains the redundant line module indicates
standby or is restarting. Any CLI or SNMP command that the system attempts to process
at the time of restart or recovery of the line module might fail. If you configured the ha
logging event category (using the log severity severityValue ha command), log messages
are displayed to specify that the line module has warm restarted or cold started.
Depending on the nature of failures, the line modules that participate in HA take the
following actions:
When a software fault occurs on the primary line module or if you enter the slot disable
or reload slot commands for the slot in which the primary line module is installed, the
Chapter 4: Managing Stateful Line Module Switchover
77