I have attached a diagram to get a better visual understanding of this.
We have 2 core switches on the LAN and a router facing a private network (wan). We currently a physical connection from Core2 to the router, it is trunked as it carries a demarc vlan (231) and a vlan for waas (232), there is eigrp peering between the core router and core switch. We also peer between the 2 core switches with vlan231 (see attached diagram).
We are now looking to connect Core1 to the wan router for redundancy purposes and we are looking for a "best practice" to implement this.
The proposal is to add a new demarc vlan (233) between Core1 and the router for eigrp peering AND also introduce V233 to the core switch peering (in addition to vlan231)... see red text in the diagram.
In order to force traffic to the wan to go through Core2, we are looking to increase the cost between Core1 and the router.
Any suggestions on the above proposal?