Hardware And Software Requirements Before Beginning A Unified Issu; Hardware Requirements For Unified Issu - Juniper SERVICE AVAILABILITY - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x Service Availability Configuration Guide
For information about modules supported on E120 and E320 routers:
For information about modules supported on the ERX1440 router:
Redundant SRP modules are required for unified ISSU support.
Unified ISSU is not supported on the ERX7xx models, the ERX1410 router, and the
ERX310 router.

Hardware and Software Requirements Before Beginning a Unified ISSU

The following hardware and software prerequisites must be met for the successful
completion of unified ISSU. You can issue the show issu command to determine
whether the routers meets these requirements.

Hardware Requirements for Unified ISSU

On the ERX1440 router, certain hardware updates might require a module to be cold
restarted. Unified ISSU cannot be successfully accomplished with such modules. In
this case, the behavior is the same as for unsupported line modules. The unified ISSU
process reboots these modules and holds them down until the supported modules
on the router complete the unified ISSU process.
When hardware updates are required for modules that you have installed in an
ERX1440 router, contact your Juniper Networks representative to determine whether
the update affects unified ISSU.
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Hardware and Software Requirements Before Beginning a Unified ISSU
See E120 and E320 Module Guide, Table 1, Modules and IOAs for detailed module
specifications.
See E120 and E320 Module Guide, Appendix A, IOA Protocol Support for information
about the modules that support unified ISSU.
See ERX Module Guide, Table 1, ERX Module Combinations for detailed module
specifications.
See ERX Module Guide, Appendix A, Module Protocol Support for information about
the modules that support unified ISSU.
The router must support unified ISSU. Therefore the router must be an E120,
E320, or ERX1440 router.
Two SRP modules must be installed in the router.
All installed combinations of line modules and IOAs must support unified ISSU.
Unsupported modules that are online are reloaded during the unified ISSU, with
consequent loss of connections and traffic forwarding.
Do not install IOAs in the chassis while the unified ISSU operation is in process.
The redundant SRP module must have at least 300 MB of free memory.
Depending on their configuration, line modules require up to 75 MB of free
memory.