Activating High Availability - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SERVICE AVAILABILITY CONFIGURATION GUIDE 2010-10-08 Configuration Manual

JunosE 11.3.x Service Availability Configuration Guide
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Activating High Availability

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52
You activate high availability (stateful SRP switchover) by launching Redundancy
Configuration mode and issuing the mode high-availability command. The
high-availability keyword enables high availability mode for stateful SRP switchover. In
this mode, the router uses mirroring to keep the configuration and state of the standby
SRP module coordinated with the configuration and state of the active SRP module.
When activating high availability, keep the following in mind:
In an E Series router that supports stateful SRP switchover, both SRP modules must
be running the same software release version in order to activate high availability mode.
If high availability mode cannot become active because of different releases on the
active and standby SRP modules, the system reverts to its default mode (file system
synchronization).
When active or pending, the router configuration files are mirrored from the active SRP
module to the standby SRP module. All other files shared between the active and
standby SRP modules are automatically synchronized using legacy synchronization
methods.
Stateful SRP Switchover Redundancy Modes on page 37
Activating High Availability on page 52
redundancy
mode
The switch route processor (SRP) module can operate in one of the two redundancy
modes—file system synchronization and high availability. When you activate high
availability, the router uses mirroring to keep the configuration and state of the standby
SRP module coordinated with the configuration and state of the active SRP module.
To activate high availability:
From Global Configuration mode, launch Redundancy Configuration mode.
1.
host1(config)#redundancy
In Redundancy Configuration mode, specify high availability as the redundancy mode.
2.
host1(config-redundancy)#mode high-availability
Stateful SRP Switchover Redundancy Modes on page 37
Guidelines for Activating High Availability on page 51
redundancy
mode
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