I have a 4510 Switch with 20+ VLANs configured on it. Several of the VLANs have IP addresses bound to them so that Inter-VLAN routing is possible. This all works fine. However I need to restrict which VLANs can route to which VLANs (as some are in a DMZ and some are on the LAN and I have a Firewall between them). I have read suggestions of using an Access-List on the VLAN, but as I am using OSPF, won't this just cause packets to be routed to a dead end and dropped? Can anyone point me in the right direction to get this sorted correctly. I am struggling to find any documentation on this.