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Guidelines for Upgrading Software
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Copyright © 2010, Juniper Networks, Inc.
Guidelines for Setting the IP Interface Priority on page 54
ip initial-sequence-preference
ipv6 initial-sequence-preference
You cannot activate stateful SRP switchover when a different release of software is
running on the standby SRP module. The router determines whether a release is the
same by viewing the build date, the release filename, and the internal version number
for the software on each SRP module.
The most efficient way to upgrade the software is to ensure that the standby SRP module
is armed with the new release and then reload the standby SRP module. This reload
occurs automatically after you download and arm a new release onto the active SRP
module and the active SRP module subsequently synchronizes with the standby SRP
module.
After reloading, and even though high availability mode is configured, the active SRP
module reverts to using the file-system-synchronization operational mode for
synchronizing updates. To complete the upgrade and place the system back in
high-availability operational mode, you must execute the srp switch command to force
the standby SRP module to take over as the active SRP module.
NOTE: Executing the srp switch command results in a cold restart of the
router.
After the switchover is initiated, the formerly active SRP module reloads the software
and starts running the same release as the newly active SRP module. When the formerly
active SRP module becomes operational as the standby SRP module, the newly active
SRP module detects that the release it is running is the same as that on the standby SRP
module and allows the originally active SRP module to resume the high-availability
operational mode.
If a fault occurs when the active SRP module is in file-system-synchronization operational
mode, the standby SRP module detects the fault and takes over, and the router
cold-restarts. For this reason, you must arm the new release only when you can accept
the resulting window of vulnerability where high availability is disabled (that is, until the
active and standby SRP modules are again running the same release).
Stateful SRP Switchover Redundancy Modes on page 37
Stateful SRP Switchover States on page 38
srp switch
Chapter 3: Managing Stateful SRP Switchover
55
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