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CAUTION: When IP tunnels are configured on an HA-enabled router and the Service
Module (SM) carrying these tunnels is reloaded, HA transitions to the pending state.
HA remains in the pending state for 5 minutes after the successful reloading of the
SM. This amount of time allows for IP tunnel relocation and for the tunnels to become
operational again on the SM. If an SRP switchover occurs while HA is in the pending
state, the router performs a cold restart.
Related Topics
Guidelines for Activating High Availability
Before you activate high availability on the SRP modules, you must be aware of any
high availability–related changes to SRP management commands. For information
on high availability-related changes to SRP, see "Managing Module Redundancy" on
page 7.
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:
Related Topics
Monitoring the Redundancy Status of Applications on page 48
show redundancy clients
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 27
Activating High Availability on page 42
redundancy
mode
Chapter 3: Managing Stateful SRP Switchover
Guidelines for Activating High Availability
41
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