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JUNOSe 11.1.x Service Availability Configuration Guide
Related Topics
Unified ISSU Terms
Table 12 on page 62 defines terms relevant to module behavior during a unified
in-service software upgrade.
Table 12: Unified ISSU-Related Terms
Unified ISSU References
For more information about stateful SRP switchovers, see "Managing Stateful SRP
Switchover" on page 25.
62
Unified ISSU Terms
The license issu command is available only on the ERX1440 CLI.
Application Support for Unified ISSU on page 71
Application Support for Stateful SRP Switchover on page 32
Activating High Availability on page 42
license issu
show issu
Term
Meaning
Cold boot
The SRP module or line module loads diagnostics from the flash file
system and runs them. When the diagnostics successfully complete,
the operational image is loaded from the flash file system and then
cold started.
Cold start
The SRP module or line module is initialized from the loaded
operational image. The line modules are reloaded and the configuration
is read from flash memory. When the line modules are operational,
their configuration data is bulk downloaded and their interfaces become
operational.
Cold restart
If the active SRP module fails, the standby SRP module takes the role
of active SRP module. When high availability is not configured, the
cold restart is similar to the cold start, except that the applications are
already loaded into memory on the standby SRP module and ready
to be started. The line modules are reloaded.
Warm restart
If the active SRP module fails, the standby SRP module takes the role
of active SRP module. Mirrored configuration data as well as any
mirrored volatile data are already resident in memory. The line
modules continue to forward data (with a small loss of packets when
the fabric is switched from the formerly active SRP module to the
newly active SRP module). The protocols and other applications
re-initialize from the mirrored data and resynchronize communications
with the line modules. When resynchronization is completed, the
router resumes normal operations, including updates of any routing
tables that result from changes that occurred during the warm restart.
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