Hi all,
I have 2 switches connected to 2 fortigate interfaces that forms a software switch. This software switch routes some Vlans that terminates at these ports. Both ports share layer 2 and 3 parameters. When traffic from different vlans reaches firewalls, I route traffic between then with rules.
I won't go into the details of this design, but the switches are in different locations and need to share networks/vlans.
With software switch, servers from both switches can directly reach the gateway with direct connections to the firewall. In some cases, I move virtual servers between locations (using a dedicated Fiber cable) and with this topology servers works with same network configuration in both sites.
I would like to connect a new cable between switch 1 and switch 2 to bypass traffic between same vlans but, if I do that, I'll form a layer 2 loop. (Red line diagram). What I would like if it's possible is:
1)Use 2 different ports in firewall to can route same networks/vlans (north south).
2)Add a new connection to bypass east-west traffic between same vlans (witouth routing). I don't want in any case to use spanning tree.
Is there any way to do that? Changing the software switch to another type of configuration would not be a problem.
I attach a symple diagram so you can better understand the topology. I know this is probably not possible, but I prefer to confirm with you. I can't form a LAG cause switches doesn't forms an MCLAG or stack and is not possible to form it with them.
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Hello,
Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.
Thanks,
Hello fortimaster,
We are still looking for someone to help you.
We will come back to you ASAP.
Regards,
Hello FortiMaster,
Adding the wire between Switch1 and switch2 will without any doubt create a loop in the network.
It is simply not possible from my understanding, there's no avoiding this without unplugging a port, using STP or keeping a port down.
Regards,
Gabriel
That's what I thought. Thanks for your help.
STP is also not supported for Software switch. This is not the right way to configure this setup but you can try by blocking Intra-switch traffic in the software switch configuration (I haven't tested and don't know the exact behavior).
That's just that I want... I will look into it.
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