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SG300 ACL with broadcast implementation

Hello,

I have a SG300-10MPP and I am trying to set it up to support several networks that may have the same subnets but I need to keep them separate. I also have a 'central' device that needs to be able to access all of the individual networks. So far, I have been able to accomplish this with ACL and ACE on my switch with great success. (In layer 2 mode)

 

I was told that I also need to support some broadcast messages on the network and here is where I am stumbling. I am OK with broadcast messages from my central device to go to all of the individual networks but I want all of the broadcast messages from those networks to all be directed to my central device. (I don't want my networks to see each other. If they do they consume bandwidth on trying to talk to each other but, as seen above, I have disallowed that with my ACL)

 

My central device will have a static IP address and I am OK with always assigning it to a specific physical port on my switch. 

 

What suggestions do you guys have? Thank you for your assistance!

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