Hi Guys,
I have just been learning some interesting things about GNS3. I have
been trying to use it on my laptop, an HP4730 with windows 7 64 bit and
8 gig of ram. I have been finding that when I build a reasonable size
network, for example lab 8 from workbook one, then it tends to run at
100% processor load and do various flaky things. One of these was that
the routers connected to the frame relay would abruptly stop responding,
usually when you were about to try to save the configuration. I tried a
number of things... I tried many different values of idlepc, I tried IOS
for 3725, 3745, and 3640 routers, asnd I tried installing the version
that runs on Ubuntu and VMware. None of these seemed to make it work
reliably. They were all OK for small numbers of devices, up to about 8
or so, but gave trouble with more, and gave high CPU usage figures.
So today I realised that I had tried everything else, so I tried a 7200
IOS. This works perfectly, the CPU usage dropped down to only a few
percent, and I did the whole of lab 8 (except the bit that needs a
command on a Catalyst switch that I don't have) and it all worked
flawlessly.
So although it might seem that a 7200 would be more hungry on resources
than the smaller routers, it seems that maybe it is not..anyway I will
stick with that IOS for the meantime.
regards
John
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