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A method for managing distributed IP packet forwarding in ATM LANE based networks

By Marko Zec, Nikola Musa and Mladen Kos


Modern "Layer-3" LAN switches employed in LANE networks posses significant IP packet forwarding capabilities, and thereby have the potential to offload the traditional one-armed inter-ELAN routers. However, in environments with more than just a few of such LAN switches installed, an efficient distribution of available aggregate IP processing power can be difficult to achieve. The sub-optimal distribution of CPU intensive IP packet forwarding tasks usually leads to poor utilization of available aggregate bandwidth, unnecessary packet traversing through the ATM backbone, and introduction of single points of failure on the IP layer. In this paper we present a simple method for managing distributed IP packet forwarding in ATM/LANE networks, based on introduction of virtual IP default gateway model and custom BUS filters for each ELAN/IP subnet. We discuss how the proposed method accomplishes an even distribution of IP forwarding tasks on all edge LAN switches, and describe our referent implementation on IBM ATM / LAN networking equipment

Year: 2002
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