I run a city network in Sweden with a lot of different service providers. The service providers assign a IP network to us for use with their service. Ex. an ISP assign a /19 to us and its up to us to mask it and run DHCP to the customers. To make things easy I put the DHCP server (and som other stuff like a customer portal) in a, lets call it service vrf. My plan was then to take the /19 null route (its originated in the RR) and export it to the service vrf, and the other way around, export a null summary from the service vrf to all other SP vrf:s. I want to do this to keep it as simple as possible and the routing table as small as possible. And of course since I'm postning here it does not work. So I thought there might be the null interface that were the problem so I did a static to an other interface /19 -> 18.104.22.168. Now it works a tad better, the route comes into the service vrf and I have connectivity with localy connected interfaces within the /19. Interfaces connected elswhere are not reachable. Anybody have any ideas ?