This article details how to check if the Junos OS is 64- or 32-bit on a router.
Just like any other operating system, the 64-bit version of the Junos operating system can address more memory than the 32-bit version of the operating system.
To support larger Routing Engine memory sizes, an upgrade from the 32-bit to the 64-bit Junos OS, which is running on the Routing Engine hardware, is necessary.
The upgrade path is relatively straightforward and another form of RE hardware and software upgrade.
Use the command "show version | match kernel."
show version | match kernel
"
Example
lab@router> show version | match kernel JUNOS OS Kernel 64-bit [20191115.14c2ad5_builder_stable_11] <-- This router is running on 64-bit Junos OS. lab@router> show version | match kernel JUNOS OS Kernel 32-bit [20200710.a76c78d_builder_stable_11] <-- This router is running on 32-bit Junos OS.
lab@router> show version | match kernel JUNOS OS Kernel 64-bit [20191115.14c2ad5_builder_stable_11] <-- This router is running on 64-bit Junos OS.
lab@router> show version | match kernel JUNOS OS Kernel 32-bit [20200710.a76c78d_builder_stable_11] <-- This router is running on 32-bit Junos OS.
2020-12-05: Added related KB articles
2022-08-11: Article checked for accuracy and found valid
64-bit RPD introduction
[Junos Platform] Identifying whether the running process is 32-bit or 64-bit