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JunosE 11.3.x Service Availability Configuration Guide
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Stateful Line Module Switchover States
84
High availability mode keeps state and dynamic configuration data from the SRP memory
synchronized between the primary and standby line modules.
When stateful line module switchover is enabled, user sessions are unaffected and
forwarding of data is briefly disrupted, and the newly active line module continues from
the point of switchover.
In high availability mode:
The contents of the volatile storage in the primary and standby line modules remain
synchronized using the mirroring methodology.
If a switchover occurs:
The standby line module warm-restarts using the mirrored data to restore itself to the
state of the system before the switchover.
During the warm restart:
User connections remain active, and forwarding continues through the chassis.
New user connection attempts during switchover are denied until switchover is
complete.
New configuration changes are prevented until switchover is complete.
Stateful Line Module Switchover States on page 84
mode
line-card switch
show redundancy history
show redundancy line-card
The line module progresses through various high availability states. These states are
illustrated in Figure 5 on page 85.
Copyright © 2010, Juniper Networks, Inc.
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