Initializing State; Active State - 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

Initializing State

Active State

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While in the disabled state, the system operates as if it were configured for file system
synchronization (for example, NVS is synchronized every 5 minutes, if autosynchronization
is enabled).
If all criteria are met, high availability mode transitions to the initialization state.
After the SRP module transitions into the initializing state, bulk synchronization of the
memory and NVS occurs. This includes the following:
File synchronization of the primary NVS with the standby NVS
Mirroring of appropriate state and dynamic configuration information from the active
SRP (memory) to the standby SRP (memory)
NOTE: Depending on the size of the configuration, this process can take
several minutes.
During the initializing state:
If an unsupported application is configured during initialization, the system completes
initializing and enters the pending state.
If any other criterion becomes false (or is no longer met), the system enters the disabled
state.
If a switchover occurs while the system is in this state, the system cold-restarts.
After initialization is completed, the system enters the active state.
During the active state, the data that was synchronized from the active SRP module to
the standby SRP module during initialization remains synchronized through mirroring
updates.
Mirroring updates occur as follows:
When making changes or updates, applications create individual transactions, perform
1.
the updates on the active SRP module, and post the transactions.
Following the updates, the active SRP module sends the changes to the standby SRP
2.
module.
The standby SRP module replays the updates (in the order in which they were
3.
committed on the active SRP module) and makes the appropriate changes for each
changed application.
Updates that need to be stored in NVS (that is, for static configurations) are updated
4.
in NVS.
Copyright © 2010, Juniper Networks, Inc.