In a network system, such as a router or a switch, it is difficult to achieve flexibility and performance at the same time. This paper proposes an architecture that consists of network processors for packet processing and a VLAN-based Ethernet backplane for switching. This allows to use flexible network processors for packet processing functions, and still exploit the cost-effectiveness of Ethernet to achieve switching capacity. The paper proposes an architecture where one uses VLAN tagging for internal traffic management, and also for distributed packet forwarding decisions between ingress and egress units.
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