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lxsw20

2473 posts

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#232091 29-Mar-2018 10:58
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We have a situation at work where we are about to share a space with another company. To stop duplication of Wifi infrastructure, we plan to share Wifi Infrastructure.

 

My plan is to have our switch stack, loop into an access port from our switch stack to an access port on their switch stack, then go up a trunk, which includes their and our WiFi networks on some shared APs with separate SSID's.

 

The issue we are having is a clash of subnets, both wanting to use 10.10.x.x. 

 

My thoughts are this actually isn't an issue, as from our perspective, they are simply piping a VLAN from an access port, up a trunk to an AP. There is zero routing between our VLAN/their VLAN and therefore the traffic inside the VLAN doesn't really matter at all.

 

This makes sense in my head, but I've got a workmate who is adamant it's going to cause issues/not work.

 

Any input greatly appreciated. 


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ArcticSilver
691 posts

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  #1985331 29-Mar-2018 11:05
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That should work fine.

 

VLAN's are layer 2, below IP which is layer 3. IP addressing is not relevant.

 

Assuming it is configured correctly, what you are doing is no different to having completely separate systems. 


BarTender
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  #1985332 29-Mar-2018 11:05
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As long as the VLANs are separate and there is no router in-between you can shared IP Address space.

 

It's pure layer 2 switched networks into your Access Points where the router connected on your end and the customer end handle the routing.

 

I would just make sure that the stack switch you are using doesn't have an IP address configured on the other companies network. Since that could cause routing between the two networks if the Layer 2 switch is inadvertently configured as a router.





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lxsw20

2473 posts

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  #1985351 29-Mar-2018 11:32
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Cool, thanks for the sanity check. 


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