Hi Sit Loong
The 3rd party router will have 2 networks in layer3. We will have one network connect to each customer 1350 and it will be in area 0. The router will then use a route filter to only accept the managment networks.
The second network will be connected to the hd2 on area 1 (or should be able to just advertise on area 0 as well but we haven’t tested this yet) and will only advertise the learned routes after filtering. This will mean that the HD2 will only learn the management network routes and not the customer ones.
Ideally though being able to filter the routes on the HD2 would remove the need for adding the 3rd party router.
Thanks
James