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Probelm with Frame Relay in GNS3

Posted on 2010-09-13
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Last Modified: 2012-05-10
Hello,
I have a problem with Frame Relay in GNS3 which i need your ideas, I setup 4 routers one of them is a Frame Relay switch, everything is good and i can ping perfectly, but there is 2 problems:
1. I can't ping the serial interface of the local router, S0/0 IP add 10.1.1.1 I can't ping it from the same router where i configured this ip address.
2. Sometimes Line protocol is UP sometimes, it is DOWN, You know that there is a Keepalive of 10 seconds, do you think there is a timeout over 10 seconds that cause the not hearing of frame relay from the routers? Specially that GNS3 consumed 60% of my CPU, I'm running it in a Acer Celeron 1.73 Ghz and 1.5 Go RAM, do you think it is the delay? because sometimes the Line protocol in the interface of each router is UP for a while then suddenly it is Down, so i assume that there is a delay of or the Frame Relay Switch doesn't hear from the routers for over than 10 seconds? ( the keepalive timer)?

I Also want to know how to save the config because I lost it now when i saved the topology.

Thank you
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Question by:david875
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rfc1180 earned 500 total points
ID: 33667858
>pecially that GNS3 consumed 60% of my CPU, I'm running it in a Acer Celeron 1.73 Ghz and 1.5 Go RAM, do you think it is the delay? because sometimes the Line protocol in the interface of each router is UP for a while then suddenly it is Down

sounds like you are not using the idle PC which can cause the issues that you are seeing.


http://softlayer.dl.sourceforge.net/project/gns-3/GNS3/0.5/GNS3-0.5-tutorial.pdf
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Author Comment

by:david875
ID: 33668369
I'm using the idle pc, so it must be probably a problem from the slowing computer right ?
Can you tell me if a new PC with 2 Go Speed and 8 Go Ram will do the work with 10 to 12 routers?
Thank you
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Expert Comment

by:rfc1180
ID: 33668502
4 routers should be ok; did you configure the idle PC correctly? 4 routers with no routing protocols (assuming you are not running any) using frame-relay should be ok on a 1.73Ghz with 1.5GB ram; assuming you are using 2600 routers with minimal memory. I have ran GNS on a P4 1.2 with 1GB of ram with no issues (4-5 routers), but upgraded to a 2GHz Quad with 4GB ram and I am able to run 19 routers (2621s) with OSPF with no issues (60 percent  CPU) and still had room to play.

Billy
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Author Comment

by:david875
ID: 33668587
waw 19 router with a 2Ghz with 4GB great, so i think i don't have to worry if i have a 8 GB RAM right?
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by:rfc1180
ID: 33668625
well, many of the routers now (2600, 3600, 3700) are end of life and support. The only one I know if that is still is supported is the 7200. You can now run a 7206VXR with a NPE-G2 in GNS, some of the new code requires at least 256-512MB of RAM, so there are times that I wish I had more than 8GB of ram. Yes, what I have does what I need. GNS has allowed me to pass my CCNP with no issues.

Good Luck
Billy
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Author Comment

by:david875
ID: 33668768
what you mean with many of the routers now (2600, 3600, 3700) are end of life and support ?
Those routers are not used any longer in a production network?
Do you think GNS is a good tool to start understand CCIE courses and Labs before putting the money on real equipement?

Can you tell me about how to save the configuration of routers in GNS cause i restarted it and the config is gone :(

You seem to me a knowlege guy, i wish if i can invit you for a coffee and discuss about networking but don't ask me for a 500 points there hahahah just joking, thank you very much for every effort you do to answer my question :)
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by:rfc1180
ID: 33668950
>Those routers are not used any longer in a production network?
I am sure they are used, but at some point the IOS images for those platforms will not be maintained much longer. I know that the 2600 series stopped at 12.3.26 GD (I think).

>Do you think GNS is a good tool to start understand CCIE courses and Labs before putting the money on real equipement?

Of course GNS is a very valuable tool; many have used to pass the CCIE

>Can you tell me about how to save the configuration of routers in GNS cause i restarted it and the config is gone

yeah, it is a pain in the A**

What has worked for me:

start GNS
start a new project, enter project name and path, select the 2 check mark boxes (Save nvrams and other disks, export router configuration files)

once your configurations are complete, write memory on all devices

on GNS, in the console"

=> save /all

Select file and then save

I am sure this is not all necessary, but in the past, you had to take several steps to ensure that your configs had been saved.

Billy

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Author Closing Comment

by:david875
ID: 33669384
thank you
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