We use Cisco Catalyst 3850 Switch (with Cisco One Foundation) as aggregation Switch for multiple Lines and connect it to a ISR 4451 for routing.
Now we search for a solution to use the Interfaces of the Cisco Catalyst as Interfaces of the ISR. I heard that should be possible to use the interfaces as virtual interfaces on the ISR. Anybody knows about this task and can give me some links for documentation?
The main task is that we want to use BGP for one Connection on the catalyst. Maybe we can add this line directly to the ISR but we want do the aggregation on the catalyst and the routing on the ISR, is this possible?
In the following Picture you can see the given infrastructure. There is a stack with two Cat3850 und each has a fibrelink to the ISR. Each Carrier is connected to a Interface on one of the catalyst and has a route to the isr. For example the Carrier 1 is connected to catalyst Gi1/0/1 and Carrier 2 to catalyst Gi2/0/1 each Port is a routed port with a IP Address as transfer Net and routed a IP Range to the ISR. Is there a possibility to address the Gi1/0/1 from the ISR as something like a virtual device.