As we have MPLS and VPLS support inside Mikrotik, because some providers find MPLS too expensive and complicated to deploy, and because they begin to use PBB to deliver traffic to clients, why is there no support for PBB (802.1ah) inside Mikrotik and more generaly on Linux ?
This would avoid to use expensive Cisco routers at client sites.
This seems now important because new Ethernet media technologies like Ethernet carrier, metro, and Ethernet in the first mile (EFM) begin to replace older SDH / PDH and xDSL / ATM technologies.
For those who don’t know 802.1ah, it is something like a more powerfull 802.1ad (Q in Q).
802.1ah do allow to transport 802.1ad , VLAN 802.1q or untagged frames to the clients with full MAC address isolation between clients and providers networks, using some more tags in a specific 802.1ah header.
More informations here :