I have a requirement to provide the highest level of redunancy between a 3850 stack and 2 x 3925 routers
The routers both have a 4 port switch card and the original thought was to run 2 x L3 port channels to the switch stack,
But I have discovered this is not supported.
I am looking for suggestions on the best way to implement redundant connections between two routers and a 3850 stack.
I suppose the principle is the same for 1 / 2 or 3 routers.
Each router will be peering iBGP to the 3850 stack,
Are there any best practise Cisco designs for this?
Diagram below
![router-redundancy.jpg](/legacyfs/online/legacy/5/2/1/171125-router-redundancy.jpg)
Many Thanks