[nsp] Is 128MB enough for a full BGP table on a 7206VXR?

Vincent De Keyzer vincent at dekeyzer.net
Tue Feb 24 12:03:18 EST 2004

Thanks Jeff,

but how come I don't observe I/O-2 on all my other 7206VXRs?


> On the 72xx, system memory is divided into the three

> categories you observed (processor, I/O, and I/O-2). I/O-2 

> is referred to as PCI memory on legacy (i.e., non-VXR) 

> platforms. The function of each of these pools is:


> Processor memory: This pool is used for storing the Cisco

> IOS software 

> code, the routing tables, and the system buffers. It's

> allocated from the DRAM on the NPE-100, NPE-150, and the

> NPE-200; the SDRAM region on the NPE-175 and NPE-225; and

> SDRAM bank 1 on the NPE-300.


> I/O memory: This pool is used for particle pools. Both

> the interface 

> private pools and the public particle pool are allocated

> from this memory. The size of this memory depends on the

> type of NPE. The NPE-150 and the NPE-200 both have a fixed

> amount of SRAM that is used for a form of Input/Output (I/O)

> memory: 1 MB for the NPE-150 and 4 MBs for the NPE-200. The

> NPE-300 uses its SDRAM bank 0 which is fixed at 32 MB.


> PCI memory: This small pool is mainly used for interface

> receive and 

> transmit rings. It is sometimes used to allocate private

> interface particle pools for high-speed interfaces. On

> NPE-175, NPE-225, and NPE-300 systems, this pool is created

> in SDRAM. On the NPE-150 and NPE-200, it's created entirely

> on SRAM.


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