Re: Idle-max value in Dynamips

Most of the problems you will run into with Dynamips will involve weird
layer 2 issues involving trunks, access ports and SVI's. Sometimes they
work, sometimes they don't. Sometimes reloading the topology works,
sometimes it doesn't. In some cases you can if have an access port and an
SVI behind it, you can simply remove the access port and replace it with a
layer 3 port. From a functional point of view the topology is exactly the
same, but the problem is goes away.

If you run a hybrid setup with real switches and dynamips routers, most of
the problems will go away. There will be other fun issues involving MTU, but
the problems won't be as common.

I run a full INE topology at home and run Dynamips almost exclusively for
Narbik's workbooks. As I mentioned before, almost everything you will do in
Narbik's workbooks is based on a very simple topology. He teaches the
technology with an absolute minimal amount of fluff. You will be hard
pressed to find dynamips related problems with Narbik's stuff.

On Tue, May 17, 2011 at 8:36 PM, Elliott Reyes <
fontananetworkengineer_at_gmail.com> wrote:

> I'm using GNS3 and I usually have to readjust idle pc especially on
> switches. Also usually loading the initial config files I had to modify .net
> file to make it work right for the interface mappings. I alway's hear Narbik
> labs are good but haven't had a chance to get to them. I have real lab as
> well as GNS3 for INE and it seems to work ok so far.
>
>
> On Tue, May 17, 2011 at 8:54 AM, Michael Kiefer <mjkiefer_at_gmail.com>wrote:
>
>> Expect lots of problems with INE's .net. It's not that it is inherently
>> bad or anything, it's just that their topology suffers badly in dynamips.
>> You will run into to all of the usual dynamips problems that don't exist on
>> the real gear. Things will get worse as you start complicating the config.
>>
>> Narbik's workbooks are top notch and will give you a whole lot more bang
>> for the buck as far as dynamips is considered. 95% of his labs only involve
>> 3 - 5 routers and can use the default dynamips layer 2 switches.
>>
>> That's my 2 cents.
>>
>>
>>
>>
>>
>> On Tue, May 17, 2011 at 11:19 AM, Shane K <shanekgs_at_gmail.com> wrote:
>>
>>> Are you guys using the INE.net file for VOL1?
>>> Any issues?
>>>
>>> S
>>>
>>> On Tue, May 17, 2011 at 2:49 PM, Elliott Reyes <
>>> fontananetworkengineer_at_gmail.com> wrote:
>>>
>>> > I tried this suggestion earlier with my INE .net file and was able to
>>> run
>>> > all routers at around 21 percent CPU. I just had problems with the
>>> >
>>> > Switches I couldnt add my vlans without getting a error.
>>> >
>>> > I'm using INE for the VOL I scenario's.
>>> >
>>> >
>>> >
>>> >
>>> > On Sun, May 15, 2011 at 12:31 AM, Daniel Dib <daniel.dib_at_reaper.nu>
>>> wrote:
>>> >
>>> > > Hi guys,
>>> > >
>>> > > I found a tip about tweaking the idlemax value to 100 which
>>> drastically
>>> > > decreases the CPU load. With it enabled I can run the full INE
>>> topology
>>> > in
>>> > > Windows 7 on my laptop, without it I can't even start all the
>>> routers.
>>> > When
>>> > > it is enabled I have about 20-40% CPU-load. I can't really find a
>>> good
>>> > > description of what this really does.
>>> > >
>>> > > According to Greg:" idlemax is the number of times that the code
>>> executes
>>> > > the address defined as the idlepc value before going to sleep. The
>>> > default
>>> > > is 1500 times."
>>> > >
>>> > > Are any of you other guys running this and have you seen any
>>> implications
>>> > > of
>>> > > doing it? Thanks in advance.
>>> > >
>>> > > /Daniel
>>> > >
>>> > >
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>>> > >
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Received on Wed May 18 2011 - 09:53:23 ART