?– Ethernet OAM Technically, the Ethernet OAM (notably IEEE 802.1ag) is not
yet ratified; once this is finalized, OAM functionality will be more widely incorporated
in products.
?– Ethernet in WAN The MEF has begun work on ensuring Ethernet is viable
???deeper in the Service Provider??? networks. This will greatly guide the deployment
of Ethernet beyond the MAN/access where it is largely concentrated.
?– Provider Backbone Bridge (PBB) This is the IEEE 802.1ah standard (currently
underway) that enables a MAC-in-MAC encapsulation. Basically, this creates
separate customer and Service Provider domains by encapsulating customer/
end user MAC addresses with Service Provider??”based MAC addresses. This approach
will remove the scaling limitations traditionally posed by Ethernet, and
extend the number of service instances from over 4K to several million.
?– Provider Backbone Bridging??”Transport Engineering (PBB-TE) The
IEEE 802.1Qay standard is addressing PBB-TE, which is focused on providing
Point-to-Point Ethernet tunnels across a metro and beyond. These connections
will ensure a solid QoS and effectively simulate a circuit switched path, and are
528 Chapter 16
targeted to support mission-critical and latency sensitive applications.
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