SUMMARYExisting IP routing algorithms have been developed mainly for non-VLAN networks. For these routing algorithms to work, an end station must be attached to its associated network. The introduction of VLAN has, however, allowed the physical location of the end station to be changed from time to time. Therefore, some extra mechanism is required to support routing in VLAN environment. Existing approaches have some drawbacks in terms of inefficiency in traffic forwarding and switch software complexity. In this paper, a simple and efficient method for routing over IP subnet VLAN in Ethernet is proposed. This method has been implemented in hardware and found to work correctly. Various measurements and analyses have been performed to verify the efficiency of this protocol.
This paper describes a simple method of implementing an IP subnet VLAN. Normally, switches have to exchange VLAN membership information with its neighboring switches via some form of VLAN registration protocol. This is to ensure proper operation of VLAN forwarding and VLAN filtering services in a LAN. However, in the implementation done by the authors in this paper, no VLAN membership information is exchanged between any switches. The VLAN registration protocol is simply replaced by the router that sends a simple periodic multicast packet to all switches in the LAN. Some coJ$ormance testing is done to v e n b the correctness of the implementation. Some minor limitations about the implementation are described us well.
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