All networks shown in the exhibit contain more than one BGP speaking router. You operate ISP A.
You must ensure that customer Y sends their traffic to you over the directly connected link but
customer Y is not used for transit into your network. What do you do to accomplish this?
Advertise routes to customer Y with the well-known no-transit community.
Advertise routes to customer X with the well-known no-advertise community.
Advertise routes to customer Y with the well-known no-export community.
Advertise routes to customer X with the well-known as-transit community.
2 Comments on “You operate ISP”
no-export — Routes containing this community name are not advertised outside a BGP confederation boundary.