You can put 4GB safely into 3945E: > On 13 Jan 2019, at 19:54, Mark Leonard <[email protected]> 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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