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To Route or not To Route

Sorry if this is too basic or already covered in another thread (I looked but did not find).

I have a Cat6000 with Sup720. I have two droups of VLANs (call them GroupA and GroupB). I want the Sup 720 to be able to route traffic within each group but not between the groups. As in GroupA VLANs should be able to communicate with each other and GroupB VLANs should be able to communicate with each other. But traffic should not route between the groups (no B-to-A or A-to-B).

I could stop the traffic with a bunch of ACLs but I suspect that there may be another way that is a bit more fundamental. I don't want any traffic to pass. I want the Sup720 to act like two seperate routers without a connection.

I want the Sup720 to provide routing within each group but I want the routing between the groups to be handled by another (external) system.

Any options?

Thanks.

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