Comment by yayachiken
14 hours ago
> This also describes transit and describes getting internet service at home.
Well no. Transit means that you use another AS (usually by a larger ISP) to get connectivity to a certain AS. And as for your internet service at home, unless you announce an AS, you are not peering with anyone.
Peering has everything to do with the physical interconnect and nothing to do with the ID numbers used to describe that interconnect, IMO.
Then we are just talking about two different things.
On ISP level, routing tables are built via BGP. BGP needs Autonomous Systems (AS) as organization unit to work. If you are not an AS you are never a peer as you are not on equal footing.
As a rule of thumb, if your edge router has a default route set, we are very likely talking about different scales.
ISPs are encouraged to — but rarely do — use private ASNs with single–homed BGP customers.