
Managing Routers and BNX Platforms
7-32
Partitioning Overview
Processor modules in a router use three types of memory:
• Global memory
• Local memory
• Nonvolatile RAM (NVRAM)
Global and local memory are separate partitions of a single, contiguous memory
address space. The RAM chips associated with this address space exist physically
on each processor module.
The NVRAM for each processor module stores the memory partitioning
configuration associated with that module. You cannot partition NVRAM.
Note carefully the differences in how NVRAM supports processor modules in
PPX- and VME-bus Bay Networks routers:
You can specify the amount of local and global memory (that is, the size of the
local and global memory partitions) used by a given processor module. Increasing
the size of the Global Memory partition automatically decreases the size of the
Local Memory partition. The router software ensures that the sum of local and
global memory always equals the total amount of memory available on a given
processor.
Site Manager does not allow you to configure more than 4 MB of global memory
to an ACE32 processor if an ACE25 module resides in the same router. You
overcome this constraint in a router with an ACE32 processor by upgrading any
ACE25 processors in the same router to ACE32 processors.
FRE2
(PPX-bas
ed routers)
NVRAM is present on each
FRE2 processor module inside
the router.
If you move a FRE2 module to
another slot in the router, the
memory partitioning configuration
moves with the FRE2 module to the
new slot.
ACE32
(VME-bas
ed routers)
For routers using ACE32
processor modules, NVRAM is
only present on the SYSCON
processor module.
If you move an ACE32 module to
another slot in the router, the
memory partitioning configuration
does
not
move with the ACE32
module to the new slot. The
partitioning remains in effect at the
original slot location.
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