[c-nsp] Max usable RAM on a Cisco 3945E?

[Łukasz Bromirski]

You can put 4GB safely into 3945E:

> On 13 Jan 2019, at 19:54, Mark Leonard <mark at bernoullinetworks.com> wrote:
> 
> Hi all,
> 
> I recall reading back in the day that the ISR G2 series (specifically
> the 3900s) couldn't address more than 2GB of RAM even though kits were
> available for 4GB.  Was this ever resolved through an IOS update?
> 
> Situation: I have a (new to me) 3945E that I'd like to have do
> multiple peers with full IPv4&v6 tables.  It has 1GB and that's
> clearly not enough (started running out of RAM with the first peer).
> 
> Are there any FIB/CEF limits that I will end up hitting if I proceed
> with the 3945E?  Should I cut my losses and start saving up for an
> ASR1k?

System Bootstrap, Version 15.1(1r)T4, RELEASE SOFTWARE (fc1)
[…]
Total memory size = 4096 MB - DIMM0 = 2048 MB, DIMM1 = 2048 MB
CISCO3945-CHASSIS with C3900-SPE250/K9 with 3145728 Kbytes of main memory
Main memory is configured to 72/72(dimm 0/1) bit mode with ECC enabled
[…]
Cisco CISCO3945-CHASSIS (revision 1.0) with C3900-SPE250/K9 with 2839552K/306176K bytes of memory.
Processor board ID […]
8 Gigabit Ethernet interfaces
2 terminal lines
1 Virtual Private Network (VPN) Module
DRAM configuration is 72 bits wide with parity enabled.
256K bytes of non-volatile configuration memory.
2572272K bytes of USB Flash usbflash0 (Read/Write)
250880K bytes of ATA System CompactFlash 0 (Read/Write)
500472K bytes of ATA CompactFlash 1 (Read/Write)

Router#sh mem stat
                Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
Processor   22B0A394   2572115052   145640160   2426474892   2426406192   2426253124
      I/O   1000A394   313524224    91213096   222311128   222311128   222283280

ASR 1001X/1001HX is always best bet for hardware forwarding :)

—
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