Have you looked at the option of using a private vlan? Not sure of other design goals, but that might provide what you're looking for.
Sorry Eric, let me try be more clear.For example, the vlan 100 is tagged on ports 20-30 and also to the uplink 48.The packets are coming from ports 20-30 and they will have to communicate to a BRAS server and the path to the BRAS server is only port 48.The packets coming from the particular port 20 with vlan 100 do not have to talk to the ports 21-30 just to 48.But others vlans will.
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