gns3 with layer 3 switch

I use the NM-16ESW with my 3725 IOS to simulate the layer 3 switch on my GNS3 version 1.3.13. I configured the SVI and a defaiult route. When I did show IP route, my last resort route was not set. Any ideas experts?. Thanks
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leblancAccountingAsked:
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JustInCaseConnect With a Mentor Network EngineerCommented:
Does next hop exist and is reachable (interfaces up up)?
If not - default route will be removed.
If yes - most likely GNS3 bug.

If routing is enabled default gateway is not used.

With GNS3 sometimes is enough to turn off and on lab (or to recreate it again) and everything works.
Also check recommended IOS image versions for your GNS3. To have recommended IOS version can save you a lot of troubles (the same as the least buggy version of GNS3).
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Niten KumarPrincipal Systems AdministratorCommented:
Have you run the command ip default-gateway X.X.X.X command to setup the switch default gateway where X.X.X.X is router IP.

By the way there is a better way to simulate a L3 switch in GNS3 where you can get actual switch simulation.  I believe in your case you are using a router and adding a module to simulate a switch.
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leblancAccountingAuthor Commented:
ip routing command is enabled. So I use the ip route 0.0.0.0 0.0.0.0 10.10.10.1 and the strange thing is I could not ping the next hop even though everything is up & up. Itis just two layer 3 switches connected to each other.

Niten,
What is the  better way to simulate a L3 switch in GNS3?
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Niten KumarConnect With a Mentor Principal Systems AdministratorCommented:
You will need a good Windows machine with at least 8GB ram and above.  Check the guide at the following link:

http://letusexplain.blogspot.com/2015/07/cisco-iou-l2-l3-lab-with-gns3-switching.html

If you are stuck anywhere or find any part confusing then let me know.  Glad to help.
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leblancAccountingAuthor Commented:
There was something going on with GNS3 STP. I restarted Windows and GNS3 and now it is working.

Niten,
Awesome. I will try that. Thanks
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JustInCaseNetwork EngineerCommented:
You can try UNL, a little bit complicated to make it work, but one of my colleagues prepared  most of CCIE on it. Not sure how good it is, I just started to have fun with it (day1). There are tutorials on youtube how to configure it.
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