Cisco 1750 maximum memory

[holker]

Hi

Has anybody tried to put more memory than factory recomenned.
per technical specification:
max 16MB flash
max 48MB DRAM (16MB on board/32MB extra stick)

I don't understand why this router has 16MB flash if putting IOS image bigger than 7MB crashes the router.
After logging into router I get error message that router for that particular image needs 54MB Dram after decompressing.

My question: I know that cisco will not support and recommend DRAM stick bigger than 32MB
Has anybody tried that ?
This is a home lab router so I'm not concerned about ocassional crash.

 

[brianinms]

Are you sure the image you have is for a 1750?

 

[holker]

When I google for that IOS image, 1751 comes up.
That would explain the crash.

but my question still stands

Would 1750 accept 64MB stick?

There is many ebay listings indicating 1750 as one of the compatible routers.

 

[brianinms]

I don't believe it will.

 

[plshlpme]

the Flash has nothing to do with this..
different feature sets in different IOS versions require different amounts of DRAM.. (which ciscos website tells you before you download it)

lets just say you had hundreds or thousands of routers to support.. wouldnt it be nice if you could load a newer ios onto flash without erasing the image that you were currently running?

that way if the new one was corrupt or made the router unstable you could revert back....

anyways i have a 1760 and i really dont know how different they are chassis wise. but i put a 64mb stick of ram in it and it works fine..

Cisco 1760 (MPC860P) processor (revision 0x200) with 87127K/11177K bytes of memory.
Processor board ID FOC06360KFA (1634246191), with hardware revision BB67
MPC860P processor: part number 5, mask 2
2 Ethernet interfaces
1 FastEthernet interface
32K bytes of NVRAM.
16384K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

 

[eurobadger]

plshlpme

if you were testing an IOS, could you not boot from tftp? This would leave the IOS in flash intact until your were happy that the new version is OK.

EB

 

[plshlpme]

well when your in boot mode you have no routing.. so the tftp server would have to be local to you..
this is not always the case .. say you are a provider and you have nothing at a customer location othe then the router...

im just saying there are many reasons where more flash is better then less...
you could also save different configs on the flash as well..

also what if you have a site that is connected via satellite.. a 17mb ios can take over 10 hours to upload because of the latency.. you really dont want your site to be down that long waiting for an ios to load up.

 

[plshlpme]

i know its a totally different platform but i had a 827 which said the max ram was 32mb.. 16 on board plus a 16mb stick.. i added a 32mb stick from a 2600 router and booted it up and it showed 48 mb. so the limitations are likely not as strict as they appear...

ram is pretty cheap these days anyways so it probably wouldnt hurt to try to stick more into it..

 

[burtsbees]

i added a 32mb stick from a 2600 router and booted it up and it showed 48 mb."

That's because of 16MB onboard, I believe...

Burt

 

[plshlpme]

ya the point is that it said the max was 32mb including the onboard.. i added a 32mb stick to go beyond what they posted as the maxdram.

 

[holker]

Just for the record

I added today 64MB stick to my 1750.
It didn't recognize any memory beyond 48MB limit.

On the other hand, my other router 1751 happily took the 64MB stick and now shows 96MB DRAM.

 

[burtsbees]

Sorry, plshlpme...I wasn't very coherent when I posted that...

Burt