From: Jonathan V Hays (jhays@jtan.com)
Date: Tue May 13 2003 - 11:52:39 GMT-3
You might find the information quoted below to be of interest. It's from
an email received from Earl Toman (CCIE 2209) back in January of this
year, when I had a question about a router he was selling on eBay:
---------
"With regard to the DRAM, the scenario on the 2500 series is as follows:
- Motherboard versions A to G had two meg of DRAM soldered onboard.
- If no other DRAM in the router, this 2 meg DRAM is used as 1 meg RAM,
1
meg shared by the 2500 family
- If a DRAM SIMM is inserted in the router, the 2 megs of onboard DRAM
is
used as shared DRAM as you mentioned.
- Motherboard versions other than A to G don't have the additional 2
megs of
DRAM. They split their DRAM SIMM memory into 2 megs of shared memory,
and
whatever is left becomes regular RAM
I happen to know the hardware rather well on this family of routers
since
I've taught Global Knowledge's "Introduction to Cisco Router Hardware"
for
quite a few years."
---------
Unfortunately he doesn't say exactly how you tell which motherboard you
have, however.
HTH,
Jonathan
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of ccie2be
> Sent: Tuesday, May 13, 2003 8:15 AM
> To: Group Study
> Subject: Re: IOS Upgrade problem
>
>
> Hi Sam,
>
> Thanks for your response. I didn't know about these 2 flavors
> of 2500's. Is
> there a way of telling which flavor a router is besides
> seeing if the copy
> tftp flash command doesn't work? Maybe from the serial # or
> something in
> the output of sh ver? Thanks very much. Jim
>
> ----- Original Message -----
> From: "Sam Munzani" <sam@munzani.com>
> To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study"
> <ccielab@groupstudy.com>;
> "kym blair" <kymblair@hotmail.com>
> Sent: Monday, May 12, 2003 10:34 AM
> Subject: Re: IOS Upgrade problem
>
>
> > In 2500 series there used to be 2 different kind of
> routers. 2500 and
> > 2500-R. The second kind of routers had enough RAM to run
> whole IOS from
> the
> > RAM. It needed flash only during boot up and after that
> whole image was
> > loaded in the RAM. These routers you can upgrade without
> config-register
> > changes. All others required config register changes.
> >
> > Sam Munzani
> > CCIE # 6479
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