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

[Jonathan Stewart]

I've got a 3945E with 2 GB of RAM and it runs BGP with 2 full and one
partial feed on v4 and v6.

v4 says; BGP using 443436482 total bytes of memory
v6 says: BGP using 84137018 total bytes of memory

I don't know where the memory limits are, but I'm not hitting them.

Oh, FYI:  C3900e Software (C3900e-UNIVERSALK9-M), Version 15.7(3)M3,
RELEASE SOFTWARE (fc2)

Jonathan

On Sun, Jan 13, 2019 at 1:44 PM Łukasz Bromirski <lukasz at bromirski.net>
wrote:

> 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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-- 
     Jonathan