Hopefully a simple eBGP question:
If I have 2 edge routers in an AS, and 2 edge routers in another AS is it best practices to have them in a square, or triangles?
By this I mean AS1 has router 1 and router 2 (running iBGP between them), and AS 2 has the same.
Is it best practice to have an eBGP peer between AS1 router 1 <-> AS2 router 1, and AS1 router 2 <-> AS2 router 2, or:
AS1 router 1 peering with AS2 router 1 and 2, and AS1 router 2 peering with AS2 router 1 and 2.
Either way, can somebody confirm the best practice and why?
Any help would be greatly appreciated.