Technical data

Configuring and Managing Routers with Site Manager
E-2 117347-A Rev. A
Partitioning Overview
Router processor modules use three types of memory:
• Global
• Local
• 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.
Table E-1 describes how NVRAM supports the processor modules in PPX-bus
and VME-bus 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 module.
Site Manager does not let you allocate more than 4 MB of global memory to an
ACE-32 processor module if an ACE-25 module resides in the same router. You
can overcome this constraint by upgrading any ACE-25 processors in the same
router to ACE-32 processors.
Table E-1. NVRAM Storage for PPX-Based and VME-Based Routers
Module NVRAM Storage
FRE-2
(PPX-based
routers)
NVRAM is present on each FRE-2 processor module inside the router. If
you move a FRE-2 module to another slot in the router, the memory
partitioning configuration moves with the FRE-2 module to the new slot.
ACE-32
(VME-based
routers)
NVRAM is present only on the SYSCON processor module. If you move
an ACE-32 module to another slot in the router, the memory partitioning
configuration does not move with the ACE-32 module to the new slot.
The partitioning remains in effect at the original slot location.