And every carrier switch must learn about all its customers' MAC addresses, which may potentially be a huge number. Only 4094 VLANs can be supported by a carrier. Scalability of Ethernet Provider bridges (IEEE 802.1ad).On the other hand, until recently, Ethernet itself did not meet transport-network requirements. The existing SONET/SDH infrastructure for instance, lacks the ability to provide the right granularity or to easily adapt to traffic bursts - although the VCAT/LCAS capabilities implemented in latest MSPPs somehow mitigate this statement. Last, but not least, Ethernet is a packet-switching technology that provides the right flexibility to carry the ever-growing IP-based traffic. The Metro Ethernet Forum (MEF) provides good material about why this is the case.īecause most business offices traffic originates from Ethernet LANs anyway, it simply makes sense for Ethernet to extend its reach inside the metropolitan network.Įthernet is a widely deployed solution, making Ethernet equipments relatively cheaper to buy and to operate, thus allowing CAPEX and OPEX savings, compared to other predominant metropolitan technologies such as ATM or SONET/SDH. IntroductionĮthernet as a transport network technology is a very attractive solution for carriers. This paper studies the latest standardization effort toward a control plane for carrier-grade Ethernet, in the light of carrier-grade Ethernet data plane and management plane. Originally designed for Local Area Networks, Ethernet is moving toward Metro Area Networks, and is now considered by many carriers as a future transport network technology. ![]() Control Plane for Carrier Grade Ethernet Abstract
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