On Tue, 23 Jun 2020 at 08:36, Mark Tinka <mark.tinka at seacom.mu> wrote: > To be clear, is the customer's device S3, or is S3 the ISP's device that > terminates the customer's service? S1-S2-S3-S1 is operator L2 metro-ring, which connects customers and 2xPE routers. It VLAN backhauls customers to PE. -- ++ytti