New Router Configuration

[new57]

hi all,

can someone help me determine what the reasons would be for upgrading a ciso 1721's dram from 32 to 48mb.

the reason i am asking, is because it is $500 upgrade, and am curious as to what considerations should be taken into account.

thanks.

 

[hexn]

A few things. There are certain version of software that require so much Flash etc. If there is no need to upgrade the software, then there is no need for the extra Flash.

In our case, whenever we buy a Cisco product, we upgrade both the Flash and DRAM to their highest capacity. The reason for this is because an upgrade in Cisco terms generally means a replacement of the stick of Flash you currently have. So an upgrade from 16 to 32 MB of flash means you have to buy a whole stick of 32 MB, not just another 16MBs.

So, it is LOTS cheaper to upgrade right up front.

Comprende?

 

[baddos]

Why you would have more DRAM is to handle more routes in the routing table. 32mb of DRAM will be sufficient for all the current IOS images for that router, and if you have a small amount of routes you will be fine.

 

[TaLioN]

As they said, the DRAM is consumed by routing table, but you may be use this router as VPN router and use many tunnel interface... It consumes DRAM too.

You maybe use it in a network on which a routing protocol has been set up, thus you'll need DRAM

Another bad point for IOS is : if you use advanced features available for this kind of routers, you'll need generally to get the largest IOS version and generally you need to load all features even if some of them are totally useless. Thus it's a basic needs to check the most suitable IOS version regarding your needs.

What has been said about Flash is not linked, just checked first your IOS version you need and check if the IOS image is greater then 16. The only interest to get a larger Flash card, is to store many different IOS versions on the same card, useful in a case of a major issue on a fresh IOS version.

Hoping it helps you,

TaL